Author: "Calcidese P." - Searchworks@Jio Institute Digital Library Search Results

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182 results on '"Calcidese P."'

1. Extreme photometric and polarimetric variability of blazar S4 0954+65 at its maximum optical and $\gamma$-ray brightness levels

Author: Raiteri, C. M., Villata, M., Carnerero, M. I., Savchenko, S. S., Kurtanidze, S. O., Vlasyuk, V. V., Marchini, A., Matsumoto, K., Lorey, C., Joner, M. D., Gazeas, K., Carosati, D., Mirzaqulov, D. O., Pulido, J. A. Acosta, Agudo, I., Bachev, R., Benítez, E., Borman, G. A., Calcidese, P., Chen, W. P., Damljanovic, G., Ehgamberdiev, S. A., Elsässer, D., Feige, M., Frasca, A., Gaur, H., Grishina, T. S., Gupta, A. C., Hiriart, D., Holland, M., Horst, B., Ibryamov, S., Ivanidze, R. Z., Jensen, J., Jithesh, V., Jovanovic, M. D., Kiehlmann, S., Kimeridze, G. N., Kishore, S., Kopatskaya, E. N., Kurtanidze, O. M., Larionova, E. G., Lin, H. C., Mannheim, K., Marinelli, C., Reyes, J. Moreira, Morozova, D. A., Nikolashvili, M. G., Reinhart, D., Romanov, F. D., Semkov, E., Seufert, J., Shishkina, E. V., Sigua, L. A., Skalidis, R., Spiridonova, O. I., Stojanovic, M., Strigachev, A., Troitskaya, Y. V., Troitskiy, I. S., Tsai, A., Vasilyev, A. A., Vince, O., Vrontaki, K., Wani, K., Watts, D., and Zhovtan, A. V.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: In 2022 the BL Lac object S4 0954+65 underwent a major variability phase, reaching its historical maximum brightness in the optical and $\gamma$-ray bands. We present optical photometric and polarimetric data acquired by the Whole Earth Blazar Telescope (WEBT) Collaboration from 2022 April 6 to July 6. Many episodes of unprecedented fast variability were detected, implying an upper limit to the size of the emitting region as low as $10^{-4}$ parsec. The WEBT data show rapid variability in both the degree and angle of polarization. We analyse different models to explain the polarization behaviour in the framework of a twisting jet model, which assumes that the long-term trend of the flux is produced by variations in the emitting region viewing angle. All the models can reproduce the average trend of the polarization degree, and can account for its general anticorrelation with the flux, but the dispersion of the data requires the presence of intrinsic mechanisms, such as turbulence, shocks, or magnetic reconnection. The WEBT optical data are compared to $\gamma$-ray data from the Fermi satellite. These are analysed with both fixed and adaptive binning procedures. We show that the strong correlation between optical and $\gamma$-ray data without measurable delay assumes different slopes in faint and high brightness states, and this is compatible with a scenario where in faint states we mainly see the imprint of the geometrical effects, while in bright states the synchrotron self-Compton process dominates., Comment: 12 pages, 13 figures, in press for MNRAS
Published: 2023

2. The APACHE survey hardware and software design: Tools for an automatic search of small-size transiting exoplanets

Author: Lattanzi M.G., Lanteri L., Damasso M., Giacobbe P., Cenadelli D., Carbognani A., Calcidese P., Bertolini E., Bernagozzi A., Christille Jean-Marc, Sozzetti A., and Smart R.
Subjects: Physics, QC1-999
Abstract: Small-size ground-based telescopes can effectively be used to look for transiting rocky planets around nearby low-mass M stars using the photometric transit method, as recently demonstrated for example by the MEarth project. Since 2008 at the Astronomical Observatory of the Autonomous Region of Aosta Valley (OAVdA), we have been preparing for the long-term photometric survey APACHE, aimed at finding transiting small-size planets around thousands of nearby early and mid-M dwarfs. APACHE (A PAthway toward the Characterization of Habitable Earths) is designed to use an array of five dedicated and identical 40-cm Ritchey-Chretien telescopes and its observations started at the beginning of summer 2012. The main characteristics of the survey final set up and the preliminary results from the first weeks of observations will be discussed.
Published: 2013
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3. The APACHE Project

Author: Giacobbe P., Christille J.-M., Damasso M., Cenadelli D., Carbognani A., Calcidese P., Bertolini E., Bernagozzi A., Sozzetti A., Lanteri L., Lattanzi M.G., and Smart R.
Subjects: Physics, QC1-999
Abstract: First, we summarize the four-year long efforts undertaken to build the final setup of the APACHE Project, a photometric transit search for small-size planets orbiting bright, low-mass M dwarfs. Next, we describe the present status of the APACHE survey, officially started in July 2012 at the site of the Astronomical Observatory of the Autonomous Region of the Aosta Valley, in the Western Italian Alps. Finally, we briefly discuss the potentially far-reaching consequences of a multi-technique characterization program of the (potentially planet-bearing) APACHE targets.
Published: 2013
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4. Multiwavelength behaviour of the blazar 3C279: decade-long study from $\gamma$-ray to radio

Author: Larionov, V. M., Jorstad, S. G., Marscher, A. P., Villata, M., Raiteri, C. M., Smith, P. S., Agudo, I., Savchenko, S. S., Morozova, D. A., Acosta-Pulido, J. A., Aller, M. F., Aller, H. D., Andreeva, T. S., Arkharov, A. A., Bachev, R., Bonnoli, G., Borman, G. A., Bozhilov, V., Calcidese, P., Carnerero, M. I., Carosati, D., Casadio, C., Chen, W. -P., Damljanovic, G., Dementyev, A. V., Di Paola, A., Frasca, A., Fuentes, A., Gómez, J. L., Gónzalez-Morales, P., Giunta, A., Grishina, T. S., Gurwell, M. A., Hagen-Thorn, V. A., Hovatta, T., Ibryamov, S., Joshi, M., Kiehlmann, S., Kim, J. -Y., Kimeridze, G. N., Kopatskaya, E. N., Kovalev, Yu. A., Kovalev, Y. Y., Kurtanidze, O. M., Kurtanidze, S. O., Lähteenmäki, A., Lázaro, C., Larionova, L. V., Larionova, E. G., Leto, G., Marchini, A., Matsumoto, K., Mihov, B., Minev, M., Mingaliev, M. G., Mirzaqulov, D., Dimitrova, R. V. Muñoz, Myserlis, I., Nikiforova, A. A., Nikolashvili, M. G., Nizhelsky, N. A., Ovcharov, E., Pressburger, L. D., Rakhimov, I. A., Righini, S., Rizzi, N., Sadakane, K., Sadun, A. C., Samal, M. R., Sanchez, R. Z., Semkov, E., Sergeev, S. G., Sigua, L. A., Slavcheva-Mihova, L., Sola, P., Sotnikova, Yu. V., Strigachev, A., Thum, C., Traianou, E., Troitskaya, Yu. V., Troitsky, I. S., Tsybulev, P. G., Vasilyev, A. A., Vince, O., Weaver, Z. R., Williamson, K. E., and Zhekanis, G. V.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies
Abstract: We report the results of decade-long (2008-2018) $\gamma$-ray to 1 GHz radio monitoring of the blazar 3C 279, including GASP/WEBT, $\it{Fermi}$ and $\it{Swift}$ data, as well as polarimetric and spectroscopic data. The X-ray and $\gamma$-ray light curves correlate well, with no delay > 3 hours, implying general co-spatiality of the emission regions. The $\gamma$-ray-optical flux-flux relation changes with activity state, ranging from a linear to a more complex dependence. The behaviour of the Stokes parameters at optical and radio wavelengths, including 43 GHz VLBA images, supports either a predominantly helical magnetic field or motion of the radiating plasma along a spiral path. Apparent speeds of emission knots range from 10 to 37c, with the highest values requiring bulk Lorentz factors close to those needed to explain $\gamma$-ray variability on very short time scales. The Mg II emission line flux in the `blue' and `red' wings correlates with the optical synchrotron continuum flux density, possibly providing a variable source of seed photons for inverse Compton scattering. In the radio bands we find progressive delays of the most prominent light curve maxima with decreasing frequency, as expected from the frequency dependence of the $\tau=1$ surface of synchrotron self-absorption. The global maximum in the 86 GHz light curve becomes less prominent at lower frequencies, while a local maximum, appearing in 2014, strengthens toward decreasing frequencies, becoming pronounced at $\sim5$ GHz. These tendencies suggest different Doppler boosting of stratified radio-emitting zones in the jet., Comment: 21 pages, 18 figures, accepted for publication in MNRAS
Published: 2020
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5. Photometric rotation periods for 107 M dwarfs from the APACHE survey

Author: Giacobbe, P., Benedetto, M., Damasso, M., Sozzetti, A., Christille, J. M., Lattanzi, M. G., Calcidese, P., Carbognani, A., Barbato, D., Pinamonti, M., Poggio, E., Lanza, A. F., Bernagozzi, A., Cenadelli, D., Lanteri, L., and Bertolini, E.
Subjects: Astrophysics - Solar and Stellar Astrophysics
Abstract: We present rotation period measurements for 107 M dwarfs in the mass range $0.15-0.70 M_\odot$ observed within the context of the APACHE photometric survey. We measure rotation periods in the range 0.5-190 days, with the distribution peaking at $\sim$ 30 days. We revise the stellar masses and radii for our sample of rotators by exploiting the Gaia DR2 data. For $\sim 20\%$ of the sample, we compare the photometric rotation periods with those derived from different spectroscopic indicators, finding good correspondence in most cases. We compare our rotation periods distribution to the one obtained by the Kepler survey in the same mass range, and to that derived by the MEarth survey for stars in the mass range $0.07-0.25 M_\odot$. The APACHE and Kepler periods distributions are in good agreement, confirming the reliability of our results, while the APACHE distribution is consistent with the MEarth result only for the older/slow rotators, and in the overlapping mass range of the two surveys. Combining the APACHE/Kepler distribution with the MEarth distribution, we highlight that the rotation period increases with decreasing stellar mass, in agreement with previous work. Our findings also suggest that the spin-down time scale, from fast to slow rotators, changes crossing the fully convective limit at $\approx0.3 M_\odot$ for M dwarfs. The catalogue of 107 rotating M dwarfs presented here is particularly timely, as the stars are prime targets for the potential identification of transiting small planets with TESS and amenable to high-precision mass determination and further atmospheric characterization measurements.
Published: 2019
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6. Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013-2017

Author: D'Ammando, F., Raiteri, C. M., Villata, M., Acosta-Pulido, J. A., Agudo, I., Arkharov, A. A., Bachev, R., Baida, G. V., Benitez, E., Borman, G. A., Boschin, W., Bozhilov, V., Butuzova, M. S., Calcidese, P., Carnerero, M. I., Carosati, D., Casadio, C., Castro-Segura, N., Chen, W. -P., Damljanovic, G., Di Paola, A., Echevarria, J., Efimova, N. V., Ehgamberdiev, Sh. A., Espinosa, C., Fuentes, A., Giunta, A., Gomez, J. L., Grishina, T. S., Gurwell, M. A., Hiriart, D., Jermak, H., Jordan, B., Jorstad, S. G., Joshi, M., Kimeridze, G. N., Kopatskaya, E. N., Kuratov, K., Kurtanidze, O. M., Kurtanidze, S. O., Lahteenmaki, A., Larionov, V. M., Larionova, E. G., Larionova, L. V., Lazaro, C., Lin, C. S., Malmrose, M. P., Marscher, A. P., Matsumoto, K., McBreen, B., Michel, R., Mihov, B., Minev, M., Mirzaqulov, D. O., Molina, S. N., Moody, J. W., Morozova, D. A., Nazarov, S. V., Nikiforova, A. A., Nikolashvili, M. G., Ohlert, J. M., Okhmat, N., Ovcharov, E., Pinna, F., Polakis, T. A., Protasio, C., Pursimo, T., Redondo-Lorenzo, F. J., Rizzi, N., Rodriguez-Coira, G., Sadakane, K., Sadun, A. C., Samal, M. R., Savchenko, S. S., Semkov, E., Sigua, L., Skiff, B. A., Slavcheva-Mihova, L., Smith, P. S., Steele, I. A., Strigachev, A., Tammi, J., Thum, C., Tornikoski, M., Troitskaya, Yu. V., Troitsky, I. S., Vasilyev, A. A., Vince, O., Hovatta, T., Kiehlmann, S., Max-Moerbeck, W., Readhead, A. C. S., Reeves, R., Pearson, T. J., Mufakharov, T., Sotnikova, Yu. V., and Mingaliev, M. G.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present a multiwavelength study of the flat-spectrum radio quasar CTA 102 during 2013-2017. We use radio-to-optical data obtained by the Whole Earth Blazar Telescope, 15 GHz data from the Owens Valley Radio Observatory, 91 and 103 GHz data from the Atacama Large Millimeter Array, near-infrared data from the Rapid Eye Monitor telescope, as well as data from the Swift (optical-UV and X-rays) and Fermi ($\gamma$ rays) satellites to study flux and spectral variability and the correlation between flux changes at different wavelengths. Unprecedented $\gamma$-ray flaring activity was observed during 2016 November-2017 February, with four major outbursts. A peak flux of (2158 $\pm$ 63)$\times$10$^{-8}$ ph cm$^{-2}$ s$^{-1}$, corresponding to a luminosity of (2.2 $\pm$ 0.1)$\times$10$^{50}$ erg s$^{-1}$, was reached on 2016 December 28. These four $\gamma$-ray outbursts have corresponding events in the near-infrared, optical, and UV bands, with the peaks observed at the same time. A general agreement between X-ray and $\gamma$-ray activity is found. The $\gamma$-ray flux variations show a general, strong correlation with the optical ones with no time lag between the two bands and a comparable variability amplitude. This $\gamma$-ray/optical relationship is in agreement with the geometrical model that has successfully explained the low-energy flux and spectral behaviour, suggesting that the long-term flux variations are mainly due to changes in the Doppler factor produced by variations of the viewing angle of the emitting regions. The difference in behaviour between radio and higher energy emission would be ascribed to different viewing angles of the jet regions producing their emission., Comment: 24 pages, 18 figures, and 4 tables. Accepted for publication in Monthly Notices of the Royal Astronomical Society
Published: 2019
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7. The flat-spectrum radio quasar 3C 345 from the high to the low emission state

Author: Berton, M., Liao, N. H., La Mura, G., Järvelä, E., Congiu, E., Foschini, L., Frezzato, M., Ramakrishnan, V., Fan, X. L., Lähteenmäki, A., Pursimo, T., Abate, V., Bai, J. M., Calcidese, P., Ciroi, S., Chen, L., Cracco, V., Li, S. K., Tornikoski, M., and Rafanelli, P.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We report simultaneous observations at different energy bands in radio, optical, UV, X-rays and $\gamma$ rays of the flat-spectrum radio-quasar 3C 345. We built the light curve of the source at different frequencies from 2008, the beginning of the \textit{Fermi} all-sky survey, to 2016, using new data and public archives. In particular we obtained several optical spectra, to study the behavior of emission lines and the continuum in different activity states and to derive the black hole mass. 3C 345 showed two flaring episodes in 2009, which occurred simultaneously in $\gamma$ ray, optical/UV and X-rays, and were later followed in radio. The source shows an inverse Compton dominated spectral energy distribution, which moved from higher to lower frequencies from the high to the low state. The reverberation of emission lines during one outburst event allowed us to constrain the location of production of $\gamma$ rays very close to the broad-line region, and possibly in the jet-base. We report the observation of an increased accretion after the outburst, possibly induced by the decrease of magnetic field intensity with respect to the low state., Comment: 14 pages, 14 figures, 4 tables, accepted for publication in Astronomy & Astrophysics
Published: 2017
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8. Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009

Author: Ahnen, M. L., Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Banerjee, B., Bangale, P., de Almeida, U. Barres, Barrio, J. A., González, J. Becerra, Bednarek, W., Bernardini, E., Berti, A., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Buson, S., Carosi, A., Chatterjee, A., Clavero, R., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., Wilhelmi, E. de Ona, Di Pierro, F., Doert, M., Domínguez, A., Prester, D. Dominis, Dorner, D., Doro, M., Einecke, S., Glawion, D. Eisenacher, Elsaesser, D., Engelkemeier, M., Ramazani, V. Fallah, Fernández-Barral, A., Fidalgo, D., Fonseca, M. V., Font, L., Frantzen, K., Fruck, C., Galindo, D., López, R. J. García, Garczarczyk, M., Terrats, D. Garrido, Gaug, M., Giammaria, P., Godinović, N., Munoz, A. González, Gora, D., Guberman, D., Hadasch, D., Hahn, A., Hanabata, Y., Hayashida, M., Herrera, J., Hose, J., Hrupec, D., Hughes, G., Idec, W., Kodani, K., Konno, Y., Kubo, H., Kushida, J., La Barbera, A., Lelas, D., Lindfors, E., Lombardi, S., Longo, F., López, M., López-Coto, R., Majumdar, P., Makariev, M., Mallot, K., Maneva, G., Manganaro, M., Mannheim, K., Maraschi, L., Marcote, B., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Miranda, J. M., Mirzoyan, R., Moralejo, A., Moretti, E., Nakajima, D., Neustroev, V., Niedzwiecki, A., Rosillo, M. Nievas, Nilsson, K., Nishijima, K., Noda, K., Nogués, L., Overkemping, A., Paiano, S., Palacio, J., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Paredes-Fortuny, X., Pedaletti, G., Peresano, M., Perri, L., Persic, M., Poutanen, J., Moroni, P. G. Prada, Prandini, E., Puljak, I., Reichardt, I., Rhode, W., Ribó, M., Rico, J., Garcia, J. Rodriguez, Saito, T., Satalecka, K., Schröder, S., Schultz, C., Schweizer, T., Shore, S. N., Sillanpää, A., Sitarek, J., Snidaric, I., Sobczynska, D., Stamerra, A., Steinbring, T., Strzys, M., Surić, T., Takalo, L., Tavecchio, F., Temnikov, P., Terzić, T., Tescaro, D., Teshima, M., Thaele, J., Torres, D. F., Toyama, T., Treves, A., Vanzo, G., Verguilov, V., Vovk, I., Ward, J. E., Will, M., Wu, M. H., Zanin, R., Abeysekara, A. U., Archambault, S., Archer, A., Benbow, W., Bird, R., Buchovecky, M., Buckley, J. H., Bugaev, V., Connolly, M. P., Cui, W., Dickinson, H. J., Falcone, A., Feng, Q., Finley, J. P., Fleischhack, H., Flinders, A., Fortson, L., Gillanders, G. H., Griffin, S., Grube, J., Hütten, M., Hanna, D., Holder, J., Humensky, T. B., Kaaret, P., Kar, P., Kelley-Hoskins, N., Kertzman, M., Kieda, D., Krause, M., Krennrich, F., Lang, M. J., Maier, G., McCann, A., Moriarty, P., Mukherjee, R., Nieto, D., O'Brien, S., Ong, R. A., Otte, N., Park, N., Perkins, J., Pichel, A., Pohl, M., Popkow, A., Pueschel, E., Quinn, J., Ragan, K., Reynolds, P. T., Richards, G. T., Roache, E., Rovero, A. C., Rulten, C., Sadeh, I., Santander, M., Sembroski, G. H., Shahinyan, K., Telezhinsky, I., Tucci, J. V., Tyler, J., Wakely, S. P., Weinstein, A., Wilcox, P., Wilhelm, A., Williams, D. A., Zitzer, B., Razzaque, S., Villata, M., Raiteri, C. M., Aller, H. D., Aller, M. F., Larionov, V. M., Arkharov, A. A., Blinov, D. A., Efimova, N. V., Grishina, T. S., Hagen-Thorn, V. A., Kopatskaya, E. N., Larionova, L. V., Larionova, E. G., Morozova, D. A., Troitsky, I. S., Ligustri, R., Calcidese, P., Berdyugin, A., Kurtanidze, O. M., Nikolashvili, M. G., Kimeridze, G. N., Sigua, L. A., Kurtanidze, S. O., Chigladze, R. A., Chen, W. P., Koptelova, E., Sakamoto, T., Sadun, A. C., Moody, J. W., Pace, C., Pearson III, R., Yatsu, Y., Mori, Y., Carraminyana, A., Carrasco, L., de la Fuente, E., Norris, J. P., Smith, P. S., Wehrle, A., Gurwell, M. A., Zook, Alma, Pagani, C., Perri, M., Capalbi, M., Cesarini, A., Krimm, H. A., Kovalev, Y. Y., Kovalev, Yu. A., Ros, E., Pushkarev, A. B., Lister, M. L., Sokolovsky, K. V., Kadler, M., Piner, G., Lähteenmäki, A., Tornikoski, M., Angelakis, E., Krichbaum, T. P., Nestoras, I., Fuhrmann, L, Zensus, J. A., Cassaro, P., Orlati, A., Maccaferri, G., Leto, P., Giroletti, M., Richards, J. L., Max-Moerbeck, W., and Readhead, A. C. S.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present an extensive study of the BL Lac object Mrk 501 based on a data set collected during the multi-instrument campaign spanning from 2009 March 15 to 2009 August 1 which includes, among other instruments, MAGIC, VERITAS, Whipple 10-m, Fermi-LAT, RXTE, Swift, GASP-WEBT and VLBA. We find an increase in the fractional variability with energy, while no significant interband correlations of flux changes are found in the acquired data set. The higher variability in the very high energy (>100 GeV, VHE) gamma-ray emission and the lack of correlation with the X-ray emission indicate that the highest-energy electrons that are responsible for the VHE gamma-rays do not make a dominant contribution to the ~1 keV emission. Alternatively, there could be a very variable component contributing to the VHE gamma-ray emission in addition to that coming from the synchrotron self-Compton (SSC) scenarios. The space of SSC model parameters is probed following a dedicated grid-scan strategy, allowing for a wide range of models to be tested and offering a study of the degeneracy of model-to-data agreement in the individual model parameters. We find that there is some degeneracy in both the one-zone and the two-zone SSC scenarios that were probed, with several combinations of model parameters yielding a similar model-to-data agreement, and some parameters better constrained than others. The SSC model grid-scan shows that the flaring activity around 2009 May 22 cannot be modeled adequately with a one-zone SSC scenario, while it can be suitably described within a two-independent-zone SSC scenario. The observation of an electric vector polarization angle rotation coincident with the gamma-ray flare from 2009 May 1 resembles those reported previously for low frequency peaked blazars, hence suggesting that there are many similarities in the flaring mechanisms of blazars with different jet properties., Comment: 33 pages, 15 figures, accepted for publication in A&A. Corresponding authors: Marlene Doert (marlene.doert@tu-dortmund.de) and David Paneque (dpaneque@mppmu.mpg.de)
Published: 2016
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9. SIOUX project: a simultaneous multiband camera for exoplanet atmospheres studies

Author: Christille, Jean Marc, Bonomo, Aldo Stefano, Borsa, Francesco, Busonero, Deborah, Calcidese, Paolo, Claudi, Riccardo, Damasso, Mario, Giacobbe, Paolo, Molinari, Emilio, Pace, Emanuele, Riva, Alberto, Sozzetti, Alessandro, Toso, Giorgio, and Tresoldi, Daniela
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract: The exoplanet revolution is well underway. The last decade has seen order-of-magnitude increases in the number of known planets beyond the Solar system. Detailed characterization of exoplanetary atmospheres provide the best means for distinguishing the makeup of their outer layers, and the only hope for understanding the interplay between initial composition chemistry, temperature-pressure atmospheric profiles, dynamics and circulation. While pioneering work on the observational side has produced the first important detections of atmospheric molecules for the class of transiting exoplanets, important limitations are still present due to the lack of sys- tematic, repeated measurements with optimized instrumentation at both visible (VIS) and near-infrared (NIR) wavelengths. It is thus of fundamental importance to explore quantitatively possible avenues for improvements. In this paper we report initial results of a feasibility study for the prototype of a versatile multi-band imaging system for very high-precision differential photometry that exploits the choice of specifically selected narrow-band filters and novel ideas for the execution of simultaneous VIS and NIR measurements. Starting from the fundamental system requirements driven by the science case at hand, we describe a set of three opto-mechanical solutions for the instrument prototype: 1) a radial distribution of the optical flux using dichroic filters for the wavelength separation and narrow-band filters or liquid crystal filters for the observations; 2) a tree distribution of the optical flux (implying 2 separate foci), with the same technique used for the beam separation and filtering; 3) an exotic solution consisting of the study of a complete optical system (i.e. a brand new telescope) that exploits the chromatic errors of a reflecting surface for directing the different wavelengths at different foci.
Published: 2016
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10. New Variable Stars Discovered by the APACHE Survey. II. Results After the Second Observing Season

Author: Damasso, M., Gioannini, L., Bernagozzi, A., Bertolini, E., Calcidese, P., Carbognani, A., Cenadelli, D., Christille, J. M., Giacobbe, P., Lanteri, L., Smart, M. G. Lattanzi. R., and Sozzetti, A.
Subjects: Astrophysics - Solar and Stellar Astrophysics
Abstract: Routinely operating since July 2012, the APACHE survey has celebrated its second birthday. While the main goal of the Project is the detection of transiting planets around a large sample of bright, nearby M dwarfs in the northern hemisphere, the APACHE large photometric database for hundreds of different fields represents a relevant resource to search for and provide a first characterization of new variable stars. We celebrate here the conclusion of the second year of observations by reporting the discovery of 14 new variables., Comment: 25 pages, accepted for publication on The Journal of the American Association of Variable Star Observers (JAVVSO)
Published: 2015

11. The GAPS Programme with HARPS-N@TNG V. A comprehensive analysis of the XO-2 stellar and planetary systems

Author: Damasso, M., Biazzo, K., Bonomo, A. S., Desidera, S., Lanza, A. F., Nascimbeni, V., Esposito, M., Scandariato, G., Sozzetti, A., Cosentino, R., Gratton, R., Malavolta, L., Rainer, M., Gandolfi, D., Poretti, E., Sanchez, R. Zanmar, Ribas, I., Santos, N., Affer, L., Andreuzzi, G., Barbieri, M., Bedin, L. R., Benatti, S., Bernagozzi, A., Bertolini, E., Bonavita, M., Borsa, F., Borsato, L., Boschin, W., Calcidese, P., Carbognani, A., Cenadelli, D., Christille, J. M., Claudi, R. U., Covino, E., Cunial, A., Giacobbe, P., Granata, V., Harutyunyan, A., Lattanzi, M. G., Leto, G., Libralato, M., Lodato, G., Lorenzi, V., Mancini, L., Fiorenzano, A. F. Martinez, Marzari, F., Masiero, S., Micela, G., Molinari, E., Molinaro, M., Munari, U., Murabito, S., Pagano, I., Pedani, M., Piotto, G., Rosenberg, A., Silvotti, R., and Southworth, J.
Subjects: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract: XO-2 is the first confirmed wide stellar binary system where the almost twin components XO-2N and XO-2S have planets. This stimulated a detailed characterization study of the stellar and planetary components based on new observations. We collected high-resolution spectra with the HARPS-N spectrograph and multi-band light curves. Spectral analysis led to an accurate determination of the stellar atmospheric parameters and characterization of the stellar activity. We collected 14 transit light curves of XO-2Nb used to improve the transit parameters. Photometry provided accurate magnitude differences between the stars and a measure of their rotation periods. The iron abundance of XO-2N was found to be +0.054 dex greater, within more than 3-sigma, than that of XO-2S. We confirm a long-term variation in the radial velocities of XO-2N, and we detected a turn-over with respect to previous measurements. We suggest the presence of a second massive companion in an outer orbit or the stellar activity cycle as possible causes of the observed acceleration. The latter explanation seems more plausible with the present dataset. We obtained an accurate value of the projected spin-orbit angle for the XO-2N system (lambda=7+/-11 degrees), and estimated the real 3-D spin-orbit angle (psi=27 +12/-27 degrees). We measured the XO-2 rotation periods, and found a value of P=41.6 days in the case of XO-2N, in excellent agreement with the predictions. The period of XO-2S appears shorter, with an ambiguity between 26 and 34.5 days that we cannot solve with the present dataset alone. XO-2N appears to be more active than the companion, and this could be due to the fact that we sampled different phases of their activity cycle, or to an interaction between XO-2N and its hot Jupiter that we could not confirm., Comment: 26 pages, 25 figures, accepted for publication in Astronomy and Astrophysics
Published: 2015
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12. The GAPS programme with HARPS-N@TNG IV: A planetary system around XO-2S

Author: Desidera, S., Bonomo, A. S., Claudi, R. U., Damasso, M., Biazzo, K., Sozzetti, A., Marzari, F., Benatti, S., Gandolfi, D., Gratton, R., Lanza, A. F., Nascimbeni, V., Andreuzzi, G., Affer, L., Barbieri, M., Bedin, L. R., Bignamini, A., Bonavita, M., Borsa, F., Calcidese, P., Christille, J. M., Cosentino, R., Covino, E., Esposito, M., Giacobbe, P., Harutyunyan, A., Latham, D., Lattanzi, M., Leto, G., Lodato, G., Lovis, C., Maggio, A., Malavolta, L., Mancini, L., Fiorenzano, A. F. Martinez, Micela, G., Molinari, E., Mordasini, C., Munari, U., Pagano, I., Pedani, M., Pepe, F., Piotto, G., Poretti, E., Rainer, M., Ribas, I., Santos, N. C., Scandariato, G., Silvotti, R., Southworth, J., and Sanchez, R. Zanmar
Subjects: Astrophysics - Earth and Planetary Astrophysics
Abstract: We performed an intensive radial velocity monitoring of XO-2S, the wide companion of the transiting planet-host XO-2N, using HARPS-N at TNG in the framework of the GAPS programme. The radial velocity measurements indicate the presence of a new planetary system formed by a planet that is slightly more massive than Jupiter at 0.48 au and a Saturn-mass planet at 0.13 au. Both planetary orbits are moderately eccentric and were found to be dynamically stable. There are also indications of a long-term trend in the radial velocities. This is the first confirmed case of a wide binary whose components both host planets, one of which is transiting, which makes the XO-2 system a unique laboratory for understanding the diversity of planetary systems., Comment: 7 pages, 3 figures, accepted on A&A Letter
Published: 2014
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13. New Variable Stars Discovered by the APACHE Survey. I. Results After the First Observing Season

Author: Damasso, M., Bernagozzi, A., Bertolini, E., Calcidese, P., Carbognani, A., Cenadelli, D., Christille, J-M, Giacobbe, P., Lanteri, L., Lattanzi, M. G., Smart, R., and Sozzetti, A.
Subjects: Astrophysics - Solar and Stellar Astrophysics
Abstract: We present more than 80 new variable stars discovered during the first observing season of the APACHE survey. APACHE is a project aimed at detecting extrasolar planets transiting nearby, bright M dwarfs by using an array of small-aperture telescopes. Despite the fact that the survey is targeted to a well-defined sample of cool stars, we also reduce and analyze data for all the detected field stars. Since July 2012 dozens of different stellar fields have been monitored, leading to the detection of several variables for which we propose a classification and estimate a period, when a periodicity is evident in the data. Thanks to the SuperWASP public archive, we have also retrieved and analyzed photometric data collected by the SWASP survey, which helped us to refine the classification and the period estimation of many variables found in the APACHE database. Some of the variables present peculiarities and thus are discussed separately., Comment: accepted for publications in Journal of the American Association of Variable Star Observers (JAAVSO), Vol. 42. Typos in Table 1, column "Amplitude": from page 6 to 9 the first digit (equal to the page number) is actually an artifact and must be not considered
Published: 2014

14. The 72-Hour WEBT Microvariability Observation of Blazar S5 0716+714 in 2009

Author: Bhatta, G., Webb, J. R., Hollingsworth, H., Dhalla, S., Khanuja, A., Bachev, R., Blinov, D. A., Bottcher, M., Calle, O. J. A. Bravo, Calcidese, P., Capezzali, D., Carosati, D., Chigladze, R., Collins, A., Coloma, J. M., Efimov, Y., Gupta, A. C., Hu, S-M., Kurtanidze, O., Lamerato, A., Larionov, V. M., Lee, C. -U., Lindfors, E., Murphy, B., Nilsson, K., Ohlert, J. M., Oksanen, A., Paakkonen, P., Pollock, J. T., Rani, B., Reinthal, R., Rodriguez, D., Ros, J. A., Roustazadeh, P., Sagar, R., Sanchez, A., Shastri, P., Sillanpaa, A., Strigachev, A., Takalo, L., Vennes, S., Villata, M., Villforth, C., Wu, J., and Zhou, X.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: Context. The international whole earth blazar telescope (WEBT) consortium planned and carried out three days of intensive micro-variability observations of S5 0716+714 from February 22, 2009 to February 25, 2009. This object was chosen due to its bright apparent magnitude range, its high declination, and its very large duty cycle for micro-variations. Aims. We report here on the long continuous optical micro-variability light curve of 0716+714 obtained during the multi-site observing campaign during which the Blazar showed almost constant variability over a 0.5 magnitude range. The resulting light curve is presented here for the first time. Observations from participating observatories were corrected for instrumental differences and combined to construct the overall smoothed light curve. Methods. Thirty-six observatories in sixteen countries participated in this continuous monitoring program and twenty of them submitted data for compilation into a continuous light curve. The light curve was analyzed using several techniques including Fourier transform, Wavelet and noise analysis techniques. Those results led us to model the light curve by attributing the variations to a series of synchrotron pulses. Results. We have interpreted the observed microvariations in this extended light curve in terms of a new model consisting of individual stochastic pulses due to cells in a turbulent jet which are energized by a passing shock and cool by means of synchrotron emission. We obtained an excellent fit to the 72-hour light curve with the synchrotron pulse model.
Published: 2013
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15. Photometric transit search for planets around cool stars from the western Italian Alps: A pilot study

Author: Giacobbe, P., Damasso, M., Sozzetti, A., Toso, G., Perdoncin, M., Calcidese, P., Bernagozzi, A., Bertolini, E., Lattanzi, M. G., and Smart, R. L.
Subjects: Astrophysics - Earth and Planetary Astrophysics
Abstract: [ABRIDGED] In this study, we set out to a) demonstrate the sensitivity to <4 R_E transiting planets with periods of a few days around our program stars, and b) improve our knowledge of some astrophysical properties(e.g., activity, rotation) of our targets by combining spectroscopic information and our differential photometric measurements. We achieve a typical nightly RMS photometric precision of ~5 mmag, with little or no dependence on the instrumentation used or on the details of the adopted methods for differential photometry. The presence of correlated (red) noise in our data degrades the precision by a factor ~1.3 with respect to a pure white noise regime. Based on a detailed stellar variability analysis, a) we detected no transit-like events; b) we determined photometric rotation periods of ~0.47 days and ~0.22 days for LHS 3445 and GJ 1167A, respectively; c) these values agree with the large projected rotational velocities (~25 km/s and ~33 km/s, respectively) inferred for both stars based on the analysis of archival spectra; d) the estimated inclinations of the stellar rotation axes for LHS 3445 and GJ 1167A are consistent with those derived using a simple spot model; e) short-term, low-amplitude flaring events were recorded for LHS 3445 and LHS 2686. Finally, based on simulations of transit signals of given period and amplitude injected in the actual (nightly reduced) photometric data for our sample, we derive a relationship between transit detection probability and phase coverage. We find that, using the BLS search algorithm, even when phase coverage approaches 100%, there is a limit to the detection probability of ~90%. Around program stars with phase coverage >50% we would have had >80% chances of detecting planets with P<1 day inducing fractional transit depths >0.5%, corresponding to minimum detectable radii in the range 1.0-2.2 R_E. [ABRIDGED], Comment: 23 pages, 17 figures, 7 tables. Accepted for publication in MNRAS
Published: 2012
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16. Another look at the BL Lacertae flux and spectral variability

Author: Raiteri, C. M., Villata, M., Bruschini, L., Capetti, A., Kurtanidze, O. M., Larionov, V. M., Romano, P., Vercellone, S., Agudo, I., Aller, H. D., Aller, M. F., Arkharov, A. A., Bach, U., Berdyugin, A., Blinov, D. A., Böttcher, M., Buemi, C. S., Calcidese, P., Carosati, D., Casas, R., Chen, W. -P., Coloma, J., Diltz, C., Di Paola, A., Dolci, M., Efimova, N. V., Forné, E., Gómez, J. L., Gurwell, M. A., Hakola, A., Hovatta, T., Hsiao, H. Y., Jordan, B., Jorstad, S. G., Koptelova, E., Kurtanidze, S. O., Lähteenmäki, A., Larionova, E. G., Leto, P., Lindfors, E., Ligustri, R., Marscher, A. P., Morozova, D. A., Nikolashvili, M. G., Nilsson, K., Ros, J. A., Roustazadeh, P., Sadun, A. C., Sillanpää, A., Sainio, J., Takalo, L. O., Tornikoski, M., Trigilio, C., Troitsky, I. S., and Umana, G.
Subjects: Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: The GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT) monitored BL Lacertae in 2008-2009 at radio, near-IR, and optical frequencies. During this period, high-energy observations were performed by XMM-Newton, Swift, and Fermi. We analyse these data with particular attention to the calibration of Swift UV data, and apply a helical jet model to interpret the source broad-band variability. The GASP-WEBT observations show an optical flare in 2008 February-March, and oscillations of several tenths of mag on a few-day time scale afterwards. The radio flux is only mildly variable. The UV data from both XMM-Newton and Swift seem to confirm a UV excess that is likely caused by thermal emission from the accretion disc. The X-ray data from XMM-Newton indicate a strongly concave spectrum, as well as moderate flux variability on an hour time scale. The Swift X-ray data reveal fast (interday) flux changes, not correlated with those observed at lower energies. We compare the spectral energy distribution (SED) corresponding to the 2008 low-brightness state, which was characterised by a synchrotron dominance, to the 1997 outburst state, where the inverse-Compton emission was prevailing. A fit with an inhomogeneous helical jet model suggests that two synchrotron components are at work with their self inverse-Compton emission. Most likely, they represent the radiation from two distinct emitting regions in the jet. We show that the difference between the source SEDs in 2008 and 1997 can be explained in terms of pure geometrical variations. The outburst state occurred when the jet-emitting regions were better aligned with the line of sight, producing an increase of the Doppler beaming factor. Our analysis demonstrates that the jet geometry can play an extremely important role in the BL Lacertae flux and spectral variability., Comment: 12 pages, 10 figures, accepted for publication in A&A
Published: 2010
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17. Photometric transit search for planets around cool stars from the Western Italian Alps: a site characterization study

Author: Damasso, M., Giacobbe, P., Calcidese, P., Sozzetti, A., Lattanzi, M. G., Bernagozzi, A., Bertolini, E., and Smart, R. L.
Subjects: Astrophysics - Earth and Planetary Astrophysics
Abstract: We present the results of a site characterization study carried out at the Astronomical Observatory of the Autonomous Region of the Aosta Valley (OAVdA), in the Western Italian Alps, aimed at establishing its potential to host a photometric transit search for small-size planets around a statistically significant sample of nearby cool M dwarfs. [abridged] we gauged site-dependent observing conditions such as night-sky brightness, photometric precision, and seeing properties. Public meteorological data were also used in order to help in the determination of the actual number of useful observing nights per year. The measured zenithal $V$-band night-sky brightness is typical of that of very good, very dark observing sites. The extinction registered at $V$ band is not dissimilar from that of other sites. The median seeing over the period of in situ observations is found to be $\sim1.7^{\prime\prime}$. Given the limited duration of the observations, we did not probe any possible seeing seasonal patterns, or the details of its possible dependence on other meteorological parameters, such as wind speed and direction. Moreover, our data show that the seeing at the observatory was reasonably stable during most of the nights. The fraction of fully clear nights per year amounts to 39\%, while the total of useful nights increases to 57\% assuming a (conservative) cloud cover of not more than 50\% of the night. Based on the analysis of photometric data collected over the period May-August 2009 for three stellar fields centered on the transiting planet hosts WASP-3, HAT-P-7, and Gliese 436, we achieve seeing-independent best-case photometric precision $\sigma_\mathrm{ph}\lesssim3$ mmag (rms) in several nights for bright stars ($R\lesssim 11$ mag). A median performance $\sigma_\mathrm{ph}\sim6$ mmag during the observing period is obtained for stars with $R\lesssim13$ mag. [abridged], Comment: 42 Pages, 18 figures, 2 tables. Accepted for publication in PASP
Published: 2010
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18. Two new variable stars observed in the field of the extrasolar planet host star WASP-3

Author: Damasso, M., Carbognani, A., Calcidese, P., Giacobbe, P., Bernagozzi, A., Bertolini, E., Lattanzi, M. G., Smart, R., and Sozzetti, A.
Subjects: Astrophysics - Earth and Planetary Astrophysics
Abstract: We report the discovery of two new short-period variable stars in the Lyra constellation, GSC2.3 N208000326 and GSC2.3 N20B000251, observed at the Astronomical Observatory of Autonomous Region of the Aosta Valley. Photometric measurements collected during several days are presented and discussed. One star appears to be a delta Scuti pulsating star (P=0.07848018+/-0.00000006 days; pulsation amplitudes V=0.055 mag and R=0.045; average (V-R)=0.378+/-0.009, probable spectral type F2). Th identity of the second star (P=0.402714+/-0.000008 days) resulted more difficult to be understood. We propose that this object should be classified as an eclipsing binary system where 0.065 and 0.055 are, respectively, the depths of the primary and secondary minimum in the light curve, as observed with a non standard R filter., Comment: 13 pages, published on the Open European Journal on Variable Stars (paper # 0122)
Published: 2010

19. Multiwavelength observations of 3C 454.3. III. Eighteen months of AGILE monitoring of the 'Crazy Diamond'

Author: Vercellone, S., D'Ammando, F., Vittorini, V., Donnarumma, I., Pucella, G., Tavani, M., Ferrari, A., Raiteri, C. M., Villata, M., Romano, P., Krimm, H., Tiengo, A., Chen, A. W., Giovannini, G., Venturi, T., Giroletti, M., Kovalev, Y. Y., Sokolovsky, K., Pushkarev, A. B., Lister, M. L., Argan, A., Barbiellini, G., Bulgarelli, A., Caraveo, P., Cattaneo, P. W., Cocco, V., Costa, E., Del Monte, E., De Paris, G., Di Cocco, G., Evangelista, Y., Feroci, M., Fiorini, M., Fornari, F., Froysland, T., Fuschino, F., Galli, M., Gianotti, F., Labanti, C., Lapshov, I., Lazzarotto, F., Lipari, P., Longo, F., Giuliani, A., Marisaldi, M., Mereghetti, S., Morselli, A., Pellizzoni, A., Pacciani, L., Perotti, F., Piano, G., Picozza, P., Pilia, M., Prest, M., Rapisarda, M., Rappoldi, A., Sabatini, S., Soffitta, P., Striani, E., Trifoglio, M., Trois, A., Vallazza, E., Zambra, A., Zanello, D., Pittori, C., Verrecchia, F., Santolamazza, P., Giommi, P., Colafrancesco, S., Salotti, L., Agudo, I., Aller, H. D., Aller, M. F., Arkharov, A. A., Bach, U., Bachev, R., Beltrame, P., Benitez, E., Boettcher, M., Buemi, C. S., Calcidese, P., Capezzali, D., Carosati, D., Chen, W. P., Da Rio, D., Di Paola, A., Dolci, M., Dultzin, D., Forne, E., Gomez, J. L., Gurwell, M. A., Hagen-Thorn, V. A., Halkola, A., Heidt, J., Hiriart, D., Hovatta, T., Hsiao, H. Y., Jorstad, S. G., Kimeridze, G., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E., Kurtanidze, O., Lahteenmaki, A., Larionov, V. M., Leto, P., Ligustri, R., Lindfors, E., Lopez, J. M., Marscher, A. P., Mujica, R., Nikolashvili, M., and Nilsson, K.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We report on 18 months of multiwavelength observations of the blazar 3C 454.3 (Crazy Diamond) carried out in July 2007-January 2009. We show the results of the AGILE campaigns which took place on May-June 2008, July-August 2008, and October 2008-January 2009. During the May 2008-January 2009 period, the source average flux was highly variable, from an average gamma-ray flux F(E>100MeV) > 200E-8 ph/cm2/s in May-June 2008, to F(E>100MeV)~80E-8 ph/cm2/s in October 2008-January 2009. The average gamma-ray spectrum between 100 MeV and 1 GeV can be fit by a simple power law (Gamma_GRID ~ 2.0 to 2.2). Only 3-sigma upper limits can be derived in the 20-60 keV energy band with Super-AGILE. During July-August 2007 and May-June 2008, RXTE measured a flux of F(3-20 keV)= 8.4E-11 erg/cm2/s, and F(3-20 keV)=4.5E-11 erg/cm2/s, respectively and a constant photon index Gamma_PCA=1.65. Swift/XRT observations were carried out during all AGILE campaigns, obtaining a F(2-10 keV)=(0.9-7.5)E-11 erg/cm2/s and a photon index Gamma_XRT=1.33-2.04. BAT measured an average flux of ~5 mCrab. GASP-WEBT monitored 3C 454.3 during the whole 2007-2008 period from the radio to the optical. A correlation analysis between the optical and the gamma-ray fluxes shows a time lag of tau=-0.4 days. An analysis of 15 GHz and 43 GHz VLBI core radio flux observations shows an increasing trend of the core radio flux, anti- correlated with the higher frequency data. The modeling SEDs, and the behavior of the long-term light curves in different energy bands, allow us to compare the jet properties during different emission states, and to study the geometrical properties of the jet on a time-span longer than one year., Comment: Accepted for publication in ApJ. Adapted Abstract. 17 pages, 19 Figures, 5 Tables
Published: 2010
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20. A Photometric Transit Search for Planets around Cool Stars from the Italian Alps: Results from a Feasibility Study

Author: Damasso, M., Calcidese, P., Bernagozzi, A., Bertolini, E., Giacobbe, P., Lattanzi, M. G., Smart, R., and Sozzetti, A.
Subjects: Astrophysics - Earth and Planetary Astrophysics
Abstract: A feasibility study was carried out at the Astronomical Observatory of the Autonomous Region of the Aosta Valley demonstrating that it is a well-poised site to conduct an upcoming observing campaign aimed at detecting small-size (R
Published: 2009

21. WEBT multiwavelength monitoring and XMM-Newton observations of BL Lacertae in 2007-2008. Unveiling different emission components

Author: Raiteri, C. M., Villata, M., Capetti, A., Aller, M. F., Bach, U., Calcidese, P., Gurwell, M. A., Larionov, V. M., Ohlert, J., Nilsson, K., and Strigachev, A.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: In 2007-2008 we carried out a new multiwavelength campaign of the Whole Earth Blazar Telescope (WEBT) on BL Lacertae, involving three pointings by the XMM-Newton satellite, to study its emission properties. The source was monitored in the optical-to-radio bands by 37 telescopes. The brightness level was relatively low. Some episodes of very fast variability were detected in the optical bands. The X-ray spectra are well fitted by a power law with photon index of about 2 and photoelectric absorption exceeding the Galactic value. However, when taking into account the presence of a molecular cloud on the line of sight, the data are best fitted by a double power law, implying a concave X-ray spectrum. The spectral energy distributions (SEDs) built with simultaneous radio-to-X-ray data at the epochs of the XMM-Newton observations suggest that the peak of the synchrotron emission lies in the near-IR band, and show a prominent UV excess, besides a slight soft-X-ray excess. A comparison with the SEDs corresponding to previous observations with X-ray satellites shows that the X-ray spectrum is extremely variable. We ascribe the UV excess to thermal emission from the accretion disc, and the other broad-band spectral features to the presence of two synchrotron components, with their related SSC emission. We fit the thermal emission with a black body law and the non-thermal components by means of a helical jet model. The fit indicates a disc temperature greater than 20000 K and a luminosity greater than 6 x 10^44 erg/s., Comment: 11 pages, 7 figures, accepted for publication in A&A
Published: 2009
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22. Extreme photometric and polarimetric variability of blazar S4 0954+65 at its maximum optical and γ-ray brightness levels

Author: Raiteri, C M, primary, Villata, M, additional, Carnerero, M I, additional, Savchenko, S S, additional, Kurtanidze, S O, additional, Vlasyuk, V V, additional, Marchini, A, additional, Matsumoto, K, additional, Lorey, C, additional, Joner, M D, additional, Gazeas, K, additional, Carosati, D, additional, Mirzaqulov, D O, additional, Acosta Pulido, J A, additional, Agudo, I, additional, Bachev, R, additional, Benítez, E, additional, Borman, G A, additional, Calcidese, P, additional, Chen, W P, additional, Damljanovic, G, additional, Ehgamberdiev, S A, additional, Elsässer, D, additional, Feige, M, additional, Frasca, A, additional, Gaur, H, additional, Grishina, T S, additional, Gupta, A C, additional, Hiriart, D, additional, Holland, M, additional, Horst, B, additional, Ibryamov, S, additional, Ivanidze, R Z, additional, Jensen, J, additional, Jithesh, V, additional, Jovanovic, M D, additional, Kiehlmann, S, additional, Kimeridze, G N, additional, Kishore, S, additional, Kopatskaya, E N, additional, Kurtanidze, O M, additional, Larionova, E G, additional, Lin, H C, additional, Mannheim, K, additional, Marinelli, C, additional, Moreira Reyes, J, additional, Morozova, D A, additional, Nikolashvili, M G, additional, Reinhart, D, additional, Romanov, F D, additional, Semkov, E, additional, Seufert, J, additional, Shishkina, E V, additional, Sigua, L A, additional, Skalidis, R, additional, Spiridonova, O I, additional, Stojanovic, M, additional, Strigachev, A, additional, Troitskaya, Y V, additional, Troitskiy, I S, additional, Tsai, A, additional, Vasilyev, A A, additional, Vince, O, additional, Vrontaki, K, additional, Wani, K, additional, Watts, D, additional, and Zhovtan, A V, additional
Published: 2023
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23. An International Parallax Campaign to Measure Distance to the Moon and Mars

Author: Cenadelli, D., Zeni, M., Bernagozzi, A., Calcidese, P., Ferreira, L., Hoang, C., and Rijsdijk, C.
Abstract: Trigonometric parallax is a powerful method to work out the distance of celestial bodies, and it was used in the past to measure the distance of the Moon, Venus, Mars and nearby stars. We set up an observation campaign for high school and undergraduate students with the purpose to measure both the Moon's and Mars' parallax. To have a large enough baseline (or basis), we took simultaneous pictures of these celestial bodies from Italy and South Africa. Then, we estimated the apparent shift relative to background stars and, via trigonometry, we worked out the distances of the Moon and Mars. Reliable results were found. (Contains 7 figures and 8 footnotes.)
Published: 2009
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24. Blazar spectral variability as explained by a twisted inhomogeneous jet

Author: Raiteri, C. M., Villata, M., Acosta-Pulido, J. A., Agudo, I., Arkharov, A. A., Bachev, R., Baida, G. V., Benítez, E., Borman, G. A., Boschin, W., Bozhilov, V., Butuzova, M. S., Calcidese, P., Carnerero, M. I., Carosati, D., Casadio, C., Castro-Segura, N., Chen, W.-P., Damljanovic, G., DʼAmmando, F., Di Paola, A., Echevarría, J., Efimova, N. V., Ehgamberdiev, Sh. A., Espinosa, C., Fuentes, A., Giunta, A., Gómez, J. L., Grishina, T. S., Gurwell, M. A., Hiriart, D., Jermak, H., Jordan, B., Jorstad, S. G., Joshi, M., Kopatskaya, E. N., Kuratov, K., Kurtanidze, O. M., Kurtanidze, S. O., Lähteenmäki, A., Larionov, V. M., Larionova, E. G., Larionova, L. V., Lázaro, C., Lin, C. S., Malmrose, M. P., Marscher, A. P., Matsumoto, K., McBreen, B., Michel, R., Mihov, B., Minev, M., Mirzaqulov, D. O., Mokrushina, A. A., Molina, S. N., Moody, J. W., Morozova, D. A., Nazarov, S. V., Nikolashvili, M. G., Ohlert, J. M., Okhmat, D. N., Ovcharov, E., Pinna, F., Polakis, T. A., Protasio, C., Pursimo, T., Redondo-Lorenzo, F. J., Rizzi, N., Rodriguez-Coira, G., Sadakane, K., Sadun, A. C., Samal, M. R., Savchenko, S. S., Semkov, E., Skiff, B. A., Slavcheva-Mihova, L., Smith, P. S., Steele, I. A., Strigachev, A., Tammi, J., Thum, C., Tornikoski, M., Troitskaya, Yu. V., Troitsky, I. S., Vasilyev, A. A., and Vince, O.
Published: 2017
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25. Multiwavelength behaviour of the blazar 3C 279: decade-long study from γ-ray to radio

Author: Larionov, V M, primary, Jorstad, S G, additional, Marscher, A P, additional, Villata, M, additional, Raiteri, C M, additional, Smith, P S, additional, Agudo, I, additional, Savchenko, S S, additional, Morozova, D A, additional, Acosta-Pulido, J A, additional, Aller, M F, additional, Aller, H D, additional, Andreeva, T S, additional, Arkharov, A A, additional, Bachev, R, additional, Bonnoli, G, additional, Borman, G A, additional, Bozhilov, V, additional, Calcidese, P, additional, Carnerero, M I, additional, Carosati, D, additional, Casadio, C, additional, Chen, W-P, additional, Damljanovic, G, additional, Dementyev, A V, additional, Di Paola, A, additional, Frasca, A, additional, Fuentes, A, additional, Gómez, J L, additional, Gónzalez-Morales, P, additional, Giunta, A, additional, Grishina, T S, additional, Gurwell, M A, additional, Hagen-Thorn, V A, additional, Hovatta, T, additional, Ibryamov, S, additional, Joshi, M, additional, Kiehlmann, S, additional, Kim, J-Y, additional, Kimeridze, G N, additional, Kopatskaya, E N, additional, Kovalev, Yu A, additional, Kovalev, Y Y, additional, Kurtanidze, O M, additional, Kurtanidze, S O, additional, Lähteenmäki, A, additional, Lázaro, C, additional, Larionova, L V, additional, Larionova, E G, additional, Leto, G, additional, Marchini, A, additional, Matsumoto, K, additional, Mihov, B, additional, Minev, M, additional, Mingaliev, M G, additional, Mirzaqulov, D, additional, Muñoz Dimitrova, R V, additional, Myserlis, I, additional, Nikiforova, A A, additional, Nikolashvili, M G, additional, Nizhelsky, N A, additional, Ovcharov, E, additional, Pressburger, L D, additional, Rakhimov, I A, additional, Righini, S, additional, Rizzi, N, additional, Sadakane, K, additional, Sadun, A C, additional, Samal, M R, additional, Sanchez, R Z, additional, Semkov, E, additional, Sergeev, S G, additional, Sigua, L A, additional, Slavcheva-Mihova, L, additional, Sola, P, additional, Sotnikova, Yu V, additional, Strigachev, A, additional, Thum, C, additional, Traianou, E, additional, Troitskaya, Yu V, additional, Troitsky, I S, additional, Tsybulev, P G, additional, Vasilyev, A A, additional, Vince, O, additional, Weaver, Z R, additional, Williamson, K E, additional, and Zhekanis, G V, additional
Published: 2020
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26. Photometric rotation periods for 107 M dwarfs from the APACHE survey

Author: Giacobbe, P, primary, Benedetto, M, additional, Damasso, M, additional, Sozzetti, A, additional, Christille, J M, additional, Lattanzi, M G, additional, Calcidese, P, additional, Carbognani, A, additional, Barbato, D, additional, Pinamonti, M, additional, Poggio, E, additional, Lanza, A F, additional, Bernagozzi, A, additional, Cenadelli, D, additional, Lanteri, L, additional, and Bertolini, E, additional
Published: 2019
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27. The beamed jet and quasar core of the distant blazar 4C 71.07

Author: Raiteri, C M, primary, Villata, M, additional, Carnerero, M I, additional, Acosta-Pulido, J A, additional, Mirzaqulov, D O, additional, Larionov, V M, additional, Romano, P, additional, Vercellone, S, additional, Agudo, I, additional, Arkharov, A A, additional, Bach, U, additional, Bachev, R, additional, Baitieri, S, additional, Borman, G A, additional, Boschin, W, additional, Bozhilov, V, additional, Butuzova, M S, additional, Calcidese, P, additional, Carosati, D, additional, Casadio, C, additional, Chen, W-P, additional, Damljanovic, G, additional, Di Paola, A, additional, Doroshenko, V T, additional, Efimova, N V, additional, Ehgamberdiev, Sh A, additional, Giroletti, M, additional, Gómez, J L, additional, Grishina, T S, additional, Ibryamov, S, additional, Jermak, H, additional, Jorstad, S G, additional, Kimeridze, G N, additional, Klimanov, S A, additional, Kopatskaya, E N, additional, Kurtanidze, O M, additional, Kurtanidze, S O, additional, Lähteenmäki, A, additional, Larionova, E G, additional, Marscher, A P, additional, Mihov, B, additional, Minev, M, additional, Molina, S N, additional, Moody, J W, additional, Morozova, D A, additional, Nazarov, S V, additional, Nikiforova, A A, additional, Nikolashvili, M G, additional, Ovcharov, E, additional, Peneva, S, additional, Righini, S, additional, Rizzi, N, additional, Sadun, A C, additional, Samal, M R, additional, Savchenko, S S, additional, Semkov, E, additional, Sigua, L A, additional, Slavcheva-Mihova, L, additional, Steele, I A, additional, Strigachev, A, additional, Tornikoski, M, additional, Troitskaya, Yu V, additional, Troitsky, I S, additional, and Vince, O, additional
Published: 2019
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28. The flat-spectrum radio quasar 3C 345 from the high to the low emission state

Author: Berton, M., primary, Liao, N. H., additional, La Mura, G., additional, Järvelä, E., additional, Congiu, E., additional, Foschini, L., additional, Frezzato, M., additional, Ramakrishnan, V., additional, Fan, X. L., additional, Lähteenmäki, A., additional, Pursimo, T., additional, Abate, V., additional, Bai, J. M., additional, Calcidese, P., additional, Ciroi, S., additional, Chen, L., additional, Cracco, V., additional, Li, S. K., additional, Tornikoski, M., additional, and Rafanelli, P., additional
Published: 2018
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29. Multi-wavelength Observations of the Flaring Gamma-ray Blazar 3C 66A in 2008 October

Author: Abdo, A. A., Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bonamente, Emanuele, Borgland, A. W., Bouvier, A., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carrigan, S., Casandjian, J. M., Cavazzuti, E., Cecchi, Claudia, Çelik, Ö., Charles, E., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen Tanugi, J., Conrad, J., Costamante, L., Cutini, S., Davis, D. S., Dermer, C. D., Palma, F. d., Digel, S. W., Couto, E. d., Drell, P. S., Dubois, R., Dumora, D., Favuzzi, C., Fegan, S. J., Fortin, P., Frailis, M., Fuhrmann, L., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guillemot, L., Guiriec, S., Hadasch, D., Hayashida, M., Hays, E., Horan, D., Hughes, R. E., Itoh, R., Jóhannesson, G., Johnson, A. S., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Knödlseder, J., Kuss, M., Lande, J., Latronico, L., Lee, S., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Makeev, A., Mazziotta, M. N., Mcenery, J. E., Mehault, J., Michelson, P. F., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Naumann Godo, M., Nestoras, I., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Ozaki, M., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce Rollins, M., Piron, F., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Reyes, L. C., Ripken, J., Ritz, S., Romani, R. W., Roth, M., Sadrozinski, H. F., Sanchez, D., Sander, A., Scargle, J. D., Sgrò, C., Shaw, M. S., Smith, P. D., Spandre, G., Spinelli, P., Strickman, M. S., Suson, D. J., Takahashi, H., Tanaka, T., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tosti, Gino, Tramacere, A., Usher, T. L., Vandenbroucke, J., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, K. S., Yang, Z., Ylinen, T., Ziegler, M., Acciari, V. A., Aliu, E., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Böttcher, M., Boltuch, D., Bradbury, S. M., Buckley, J. H., Bugaev, V., Byrum, K., Cannon, A., Cesarini, A., Christiansen, J. L., Ciupik, L., Cui, W., I. d., La, Dickherber, R., Errando, M., Falcone, A., Finley, J. P., Finnegan, G., Fortson, L., Furniss, A., Galante, N., Gall, D., Gillanders, G. H., Godambe, S., Grube, J., Guenette, R., Gyuk, G., Hanna, D., Holder, J., Hui, C. M., Humensky, T. B., Imran, A., Kaaret, P., Karlsson, N., Kertzman, M., Kieda, D., Konopelko, A., Krawczynski, H., Krennrich, F., Lang, M. J., Lebohec, S., Maier, G., Mcarthur, S., Mccann, A., Mccutcheon, M., Moriarty, P., Mukherjee, R., Ong, R. A., Otte, A. N., Pandel, D., Perkins, J. S., Pichel, A., Pohl, M., Quinn, J., Ragan, K., Reynolds, P. T., Roache, E., Rose, H. J., Schroedter, M., Sembroski, G. H., Senturk, G. D., Smith, A. W., Steele, D., Swordy, S. P., Tešić, G., Theiling, M., Thibadeau, S., Varlotta, A., Vassiliev, V. V., Vincent, S., Wakely, S. P., Ward, J. E., Weekes, T. C., Weinstein, A., Weisgarber, T., Williams, D. A., Wissel, S., Wood, M., Villata, M., Raiteri, C. M., Gurwell, M. A., Larionov, V. M., Kurtanidze, O. M., Aller, M. F., Lähteenmäki, A., Chen, W. P., Berduygin, A., Agudo, I., Aller, H. D., Arkharov, A. A., Bach, U., Bachev, R., Beltrame, P., Benítez, E., Buemi, C. S., Dashti, J., Calcidese, P., Capezzali, D., Carosati, D., Rio, D. D., Paola, A. D., Diltz, C., Dolci, M., Dultzin, D., Forné, E., Gómez, J. L., Hagen Thorn, V. A., Halkola, A., Heidt, J., Hiriart, D., Hovatta, T., Hsiao, H., Jorstad, S. G., Kimeridze, G. N., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E., Leto, P., Ligustri, R., Lindfors, E., Lopez, J. M., Marscher, A. P., Mommert, M., Mujica, R., Nikolashvili, M. G., Nilsson, K., Palma, N., Pasanen, M., Roca Sogorb, M., Ros, J. A., Roustazadeh, P., Sadun, A. C., Saino, J., Sigua, L. A., Sillanää, A., Sorcia, M., Takalo, L. O., Tornikoski, M., Trigilio, C., Turchetti, R., Umana, G., Belloni, T., Blake, C. H., Bloom, J. S., Angelakis, E., Fumagalli, M., Hauser, M., Prochaska, J. X., Riquelme, D., Sievers, A., Starr, D. L., Tagliaferri, G., Ungerechts, H., Wagner, S., Zensus, J. A., Collaboration, F. L., Collaboration, V., Consortium, G., Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Théorique et Astroparticules (LPTA), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'étude spatiale des rayonnements (CESR), Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Fermi-LAT, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Abdo, A. A., Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bonamente, E., Borgland, A. W., Bouvier, A., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carrigan, S., Casandjian, J. M., Cavazzuti, E., Cecchi, C., Çelik, Ö., Charles, E., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen Tanugi, J., Conrad, J., Costamante, L., Cutini, S., Davis, D. S., Dermer, C. D., de Palma, F., Digel, S. W., do Couto, e. Silva E., Drell, P. S., Dubois, R., Dumora, D., Favuzzi, C., Fegan, S. J., Fortin, P., Frailis, M., Fuhrmann, L., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guillemot, L., Guiriec, S., Hadasch, D., Hayashida, M., Hays, E., Horan, D., Hughes, R. E., Itoh, R., Jóhannesson, G., Johnson, A. S., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Knödlseder, J., Kuss, M., Lande, J., Latronico, L., Lee, S. H., Longo, Francesco, Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Makeev, A., Mazziotta, M. N., Mcenery, J. E., Mehault, J., Michelson, P. F., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Naumann Godo, M., Nestoras, I., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Ozaki, M., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce Rollins, M., Piron, F., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Reyes, L. C., Ripken, J., Ritz, S., Romani, R. W., Roth, M., Sadrozinski, H. F. W., Sanchez, D., Sander, A., Scargle, J. D., Sgrò, C., Shaw, M. S., Smith, P. D., Spandre, G., Spinelli, P., Strickman, M. S., Suson, D. J., Takahashi, H., Tanaka, T., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Usher, T. L., Vandenbroucke, J., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, K. S., Yang, Z., Ylinen, T., Ziegler, M., Acciari, V. A., Aliu, E., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Böttcher, M., Boltuch, D., Bradbury, S. M., Buckley, J. H., Bugaev, V., Byrum, K., Cannon, A., Cesarini, A., Christiansen, J. L., Ciupik, L., Cui, W., de la Calle Perez, I., Dickherber, R., Errando, M., Falcone, A., Finley, J. P., Finnegan, G., Fortson, L., Furniss, A., Galante, N., Gall, D., Gillanders, G. H., Godambe, S., Grube, J., Guenette, R., Gyuk, G., Hanna, D., Holder, J., Hui, C. M., Humensky, T. B., Imran, A., Kaaret, P., Karlsson, N., Kertzman, M., Kieda, D., Konopelko, A., Krawczynski, H., Krennrich, F., Lang, M. J., Lebohec, S., Maier, G., Mcarthur, S., Mccann, A., Mccutcheon, M., Moriarty, P., Mukherjee, R., Ong, R. A., Otte, A. N., Pandel, D., Perkins, J. S., Pichel, A., Pohl, M., Quinn, J., Ragan, K., Reynolds, P. T., Roache, E., Rose, H. J., Schroedter, M., Sembroski, G. H., Senturk G., Demet, Smith, A. W., Steele, D., Swordy, S. P., Tešić, G., Theiling, M., Thibadeau, S., Varlotta, A., Vassiliev, V. V., Vincent, S., Wakely, S. P., Ward, J. E., Weekes, T. C., Weinstein, A., Weisgarber, T., Williams, D. A., Wissel, S., Wood, M., Villata, M., Raiteri, C. M., Gurwell, M. A., Larionov, V. M., Kurtanidze, O. M., Aller, M. F., Lähteenmäki, A., Chen, W. P., Berduygin, A., Agudo, I., Aller, H. D., Arkharov, A. A., Bach, U., Bachev, R., Beltrame, P., Benítez, E., Buemi, C. S., Dashti, J., Calcidese, P., Capezzali, D., Carosati, D., Da Rio, D., Di Paola, A., Diltz, C., Dolci, M., Dultzin, D., Forné, E., Gómez, J. L., Hagen Thorn, V. A., Halkola, A., Heidt, J., Hiriart, D., Hovatta, T., Hsiao, H. Y., Jorstad, S. G., Kimeridze, G. N., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E., Leto, P., Ligustri, R., Lindfors, E., Lopez, J. M., Marscher, A. P., Mommert, M., Mujica, R., Nikolashvili, M. G., Nilsson, K., Palma, N., Pasanen, M., Roca Sogorb, M., Ros, J. A., Roustazadeh, P., Sadun, A. C., Saino, J., Sigua, L. A., Sillanää, A., Sorcia, M., Takalo, L. O., Tornikoski, M., Trigilio, C., Turchetti, R., Umana, G., Belloni, T., Blake, C. H., Bloom, J. S., Angelakis, E., Fumagalli, M., Hauser, M., Prochaska, J. X., Riquelme, D., Sievers, A., Starr, D. L., Tagliaferri, G., Ungerechts, H., Wagner, S., Zensus, J. A., Abdo, A, Ackermann, M, Ajello, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, R, Bonamente, E, Borgland, A, Bouvier, A, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, G, Cameron, R, Caraveo, P, Carrigan, S, Casandjian, J, Cavazzuti, E, Cecchi, C, Celik, O, Charles, E, Chekhtman, A, Cheung, C, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Costamante, L, Cutini, S, Davis, D, Dermer, C, De Palma, F, Digel, S, Do Couto E Silva, E, Drell, P, Dubois, R, Dumora, D, Favuzzi, C, Fegan, S, Fortin, P, Frailis, M, Fuhrmann, L, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, I, Grove, J, Guillemot, L, Guiriec, S, Hadasch, D, Hayashida, M, Hays, E, Horan, D, Hughes, R, Itoh, R, Johannesson, G, Johnson, A, Johnson, T, Johnson, W, Kamae, T, Katagiri, H, Kataoka, J, Knodlseder, J, Kuss, M, Lande, J, Latronico, L, Lee, S, Longo, F, Loparco, F, Lott, B, Lovellette, M, Lubrano, P, Makeev, A, Mazziotta, M, Mcenery, J, Mehault, J, Michelson, P, Mizuno, T, Moiseev, A, Monte, C, Monzani, M, Morselli, A, Moskalenko, I, Murgia, S, Nakamori, T, Naumann-Godo, M, Nestoras, I, Nolan, P, Norris, J, Nuss, E, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, J, Ozaki, M, Paneque, D, Panetta, J, Parent, D, Pelassa, V, Pepe, M, Pesce-Rollins, M, Piron, F, Porter, T, Raino, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Reyes, L, Ripken, J, Ritz, S, Romani, R, Roth, M, Sadrozinski, H, Sanchez, D, Sander, A, Scargle, J, Sgro, C, Shaw, M, Smith, P, Spandre, G, Spinelli, P, Strickman, M, Suson, D, Takahashi, H, Tanaka, T, Thayer, J, Thompson, D, Tibaldo, L, Torres, D, Tosti, G, Tramacere, A, Usher, T, Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, A, Wang, P, Winer, B, Wood, K, Yang, Z, Ylinen, T, Ziegler, M, Acciari, V, Aliu, E, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Bottcher, M, Boltuch, D, Bradbury, S, Buckley, J, Bugaev, V, Byrum, K, Cannon, A, Cesarini, A, Christiansen, J, Ciupik, L, Cui, W, De La Calle Perez, I, Dickherber, R, Errando, M, Falcone, A, Finley, J, Finnegan, G, Fortson, L, Furniss, A, Galante, N, Gall, D, Gillanders, G, Godambe, S, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Holder, J, Hui, C, Humensky, T, Imran, A, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, M, Lebohec, S, Maier, G, Mcarthur, S, Mccann, A, Mccutcheon, M, Moriarty, P, Mukherjee, R, Ong, R, Otte, A, Pandel, D, Perkins, J, Pichel, A, Pohl, M, Quinn, J, Ragan, K, Reynolds, P, Roache, E, Rose, H, Schroedter, M, Sembroski, G, Senturk, G, Smith, A, Steele, D, Swordy, S, Tesic, G, Theiling, M, Thibadeau, S, Varlotta, A, Vassiliev, V, Vincent, S, Wakely, S, Ward, J, Weekes, T, Weinstein, A, Weisgarber, T, Williams, D, Wissel, S, Wood, M, Villata, M, Raiteri, C, Gurwell, M, Larionov, V, Kurtanidze, O, Aller, M, Lahteenmaki, A, Chen, W, Berduygin, A, Agudo, I, Aller, H, Arkharov, A, Bach, U, Bachev, R, Beltrame, P, Benitez, E, Buemi, C, Dashti, J, Calcidese, P, Capezzali, D, Carosati, D, Da Rio, D, Di Paola, A, Diltz, C, Dolci, M, Dultzin, D, Forne, E, Gomez, J, Hagen-Thorn, V, Halkola, A, Heidt, J, Hiriart, D, Hovatta, T, Hsiao, H, Jorstad, S, Kimeridze, G, Konstantinova, T, Kopatskaya, E, Koptelova, E, Leto, P, Ligustri, R, Lindfors, E, Lopez, J, Marscher, A, Mommert, M, Mujica, R, Nikolashvili, M, Nilsson, K, Palma, N, Pasanen, M, Roca-Sogorb, M, Ros, J, Roustazadeh, P, Sadun, A, Saino, J, Sigua, L, Sillanaa, A, Sorcia, M, Takalo, L, Tornikoski, M, Trigilio, C, Turchetti, R, Umana, G, Belloni, T, Blake, C, Bloom, J, Angelakis, E, Fumagalli, M, Hauser, M, Prochaska, J, Riquelme, D, Sievers, A, Starr, D, Tagliaferri, G, Ungerechts, H, Wagner, S, Zensus, J, Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)
Subjects: individual: 3C 66A [BL Lacertae objects], Ciencias Físicas, spectral energy-distribution, Astrophysics, BL Lacertae objects: individual (3C 66A), bright blazars, 01 natural sciences, law.invention, purl.org/becyt/ford/1 [https], bl lacertae objects, Astronomi, astrofysik och kosmologi, law, Astronomy, Astrophysics and Cosmology, 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), radio-sources, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], epoch vlbi survey, 95.45.+i, 96.60.qe,95.55.Ka, Gamma ray, veritas observations, large-area telescope, Wavelength, Gamma rays: galaxie, active [galaxies], galaxies [gamma rays], Spectral energy distribution, BL Lacertae objects: individual: 3C 66A, Astrophysics - High Energy Astrophysical Phenomena, CIENCIAS NATURALES Y EXACTAS, BL Lac object, individual (3C 66A) [BL Lacertae objects], [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, FOS: Physical sciences, Telescope, 0103 physical sciences, gamma rays: galaxies, Blazar, tev blazars, 010308 nuclear & particles physics, Scattering, background-radiation, Astronomy and Astrophysics, purl.org/becyt/ford/1.3 [https], Astronomía, Space and Planetary Science, active galactic nuclei, ddc:520, Fermi Gamma-ray Space Telescope
Abstract: 著者人数：328名, Accepted: 2010-10-29, 資料番号: SA1002650000
Published: 2011
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30. Blazar spectral variability as explained by a twisted inhomogeneous jet

Author: Raiteri C., Villata M., Acosta-Pulido J., Agudo I., Arkharov A., Bachev R., Baida G., Benítez E., Borman G., Boschin W., Bozhilov V., Butuzova M., Calcidese P., Carnerero M., Carosati D., Casadio C., Castro-Segura N., Chen W., Damljanovic G., D'Ammando F., Di Paola A., Echevarría J., Efimova N., Ehgamberdiev S., Espinosa C., Fuentes A., Giunta A., Gómez J., Grishina T., Gurwell M., Hiriart D., Jermak H., Jordan B., Jorstad S., Joshi M., Kopatskaya E., Kuratov K., Kurtanidze O., Kurtanidze S., Lähteenmäki A., Larionov V., Larionova E., Larionova L., Lázaro C., Lin C., Malmrose M., Marscher A., Matsumoto K., McBreen B., Michel R., Mihov B., Minev M., Mirzaqulov D., Mokrushina A., Molina S., Moody J., Morozova D., Nazarov S., Nikolashvili M., Ohlert J., Okhmat D., Ovcharov E., Pinna F., Polakis T., Protasio C., Pursimo T., Redondo-Lorenzo F., Rizzi N., Rodriguez-Coira G., Sadakane K., Sadun A., Samal M., Savchenko S., Semkov E., Skiff B., Slavcheva-Mihova L., Smith P., and Steele I.
Subjects: Astrophysics::High Energy Astrophysical Phenomena
Abstract: © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Blazars are active galactic nuclei, which are powerful sources of radiation whose central engine is located in the core of the host galaxy. Blazar emission is dominated by non-thermal radiation from a jet that moves relativistically towards us, and therefore undergoes Doppler beaming. This beaming causes flux enhancement and contraction of the variability timescales, so that most blazars appear as luminous sources characterized by noticeable and fast changes in brightness at all frequencies. The mechanism that produces this unpredictable variability is under debate, but proposed mechanisms include injection, acceleration and cooling of particles, with possible intervention of shock waves or turbulence. Changes in the viewing angle of the observed emitting knots or jet regions have also been suggested as an explanation of flaring events and can also explain specific properties of blazar emission, such as intra-day variability, quasi-periodicity and the delay of radio flux variations relative to optical changes. Such a geometric interpretation, however, is not universally accepted because alternative explanations based on changes in physical conditions - such as the size and speed of the emitting zone, the magnetic field, the number of emitting particles and their energy distribution - can explain snapshots of the spectral behaviour of blazars in many cases. Here we report the results of optical-to-radio-wavelength monitoring of the blazar CTA 102 and show that the observed long-term trends of the flux and spectral variability are best explained by an inhomogeneous, curved jet that undergoes changes in orientation over time. We propose that magnetohydrodynamic instabilities or rotation of the twisted jet cause different jet regions to change their orientation and hence their relative Doppler factors. In particular, the extreme optical outburst of 2016-2017 (brightness increase of six magnitudes) occurred when the corresponding emitting region had a small viewing angle. The agreement between observations and theoretical predictions can be seen as further validation of the relativistic beaming theory.
Published: 2017

31. Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009

Author: Ahnen, M. L., primary, Ansoldi, S., additional, Antonelli, L. A., additional, Antoranz, P., additional, Babic, A., additional, Banerjee, B., additional, Bangale, P., additional, Barres de Almeida, U., additional, Barrio, J. A., additional, Becerra González, J., additional, Bednarek, W., additional, Bernardini, E., additional, Berti, A., additional, Biasuzzi, B., additional, Biland, A., additional, Blanch, O., additional, Bonnefoy, S., additional, Bonnoli, G., additional, Borracci, F., additional, Bretz, T., additional, Buson, S., additional, Carosi, A., additional, Chatterjee, A., additional, Clavero, R., additional, Colin, P., additional, Colombo, E., additional, Contreras, J. L., additional, Cortina, J., additional, Covino, S., additional, Da Vela, P., additional, Dazzi, F., additional, De Angelis, A., additional, De Lotto, B., additional, de Oña Wilhelmi, E., additional, Di Pierro, F., additional, Doert, M., additional, Domínguez, A., additional, Dominis Prester, D., additional, Dorner, D., additional, Doro, M., additional, Einecke, S., additional, Eisenacher Glawion, D., additional, Elsaesser, D., additional, Engelkemeier, M., additional, Fallah Ramazani, V., additional, Fernández-Barral, A., additional, Fidalgo, D., additional, Fonseca, M. V., additional, Font, L., additional, Frantzen, K., additional, Fruck, C., additional, Galindo, D., additional, García López, R. J., additional, Garczarczyk, M., additional, Garrido Terrats, D., additional, Gaug, M., additional, Giammaria, P., additional, Godinović, N., additional, González Muñoz, A., additional, Gora, D., additional, Guberman, D., additional, Hadasch, D., additional, Hahn, A., additional, Hanabata, Y., additional, Hayashida, M., additional, Herrera, J., additional, Hose, J., additional, Hrupec, D., additional, Hughes, G., additional, Idec, W., additional, Kodani, K., additional, Konno, Y., additional, Kubo, H., additional, Kushida, J., additional, La Barbera, A., additional, Lelas, D., additional, Lindfors, E., additional, Lombardi, S., additional, Longo, F., additional, López, M., additional, López-Coto, R., additional, Majumdar, P., additional, Makariev, M., additional, Mallot, K., additional, Maneva, G., additional, Manganaro, M., additional, Mannheim, K., additional, Maraschi, L., additional, Marcote, B., additional, Mariotti, M., additional, Martínez, M., additional, Mazin, D., additional, Menzel, U., additional, Miranda, J. M., additional, Mirzoyan, R., additional, Moralejo, A., additional, Moretti, E., additional, Nakajima, D., additional, Neustroev, V., additional, Niedzwiecki, A., additional, Nievas Rosillo, M., additional, Nilsson, K., additional, Nishijima, K., additional, Noda, K., additional, Nogués, L., additional, Overkemping, A., additional, Paiano, S., additional, Palacio, J., additional, Palatiello, M., additional, Paneque, D., additional, Paoletti, R., additional, Paredes, J. M., additional, Paredes-Fortuny, X., additional, Pedaletti, G., additional, Peresano, M., additional, Perri, L., additional, Persic, M., additional, Poutanen, J., additional, Prada Moroni, P. G., additional, Prandini, E., additional, Puljak, I., additional, Reichardt, I., additional, Rhode, W., additional, Ribó, M., additional, Rico, J., additional, Rodriguez Garcia, J., additional, Saito, T., additional, Satalecka, K., additional, Schröder, S., additional, Schultz, C., additional, Schweizer, T., additional, Shore, S. N., additional, Sillanpää, A., additional, Sitarek, J., additional, Snidaric, I., additional, Sobczynska, D., additional, Stamerra, A., additional, Steinbring, T., additional, Strzys, M., additional, Surić, T., additional, Takalo, L., additional, Tavecchio, F., additional, Temnikov, P., additional, Terzić, T., additional, Tescaro, D., additional, Teshima, M., additional, Thaele, J., additional, Torres, D. F., additional, Toyama, T., additional, Treves, A., additional, Vanzo, G., additional, Verguilov, V., additional, Vovk, I., additional, Ward, J. E., additional, Will, M., additional, Wu, M. H., additional, Zanin, R., additional, Abeysekara, A. U., additional, Archambault, S., additional, Archer, A., additional, Benbow, W., additional, Bird, R., additional, Buchovecky, M., additional, Buckley, J. H., additional, Bugaev, V., additional, Connolly, M. P., additional, Cui, W., additional, Dickinson, H. J., additional, Falcone, A., additional, Feng, Q., additional, Finley, J. P., additional, Fleischhack, H., additional, Flinders, A., additional, Fortson, L., additional, Gillanders, G. H., additional, Griffin, S., additional, Grube, J., additional, Hütten, M., additional, Hanna, D., additional, Holder, J., additional, Humensky, T. B., additional, Kaaret, P., additional, Kar, P., additional, Kelley-Hoskins, N., additional, Kertzman, M., additional, Kieda, D., additional, Krause, M., additional, Krennrich, F., additional, Lang, M. J., additional, Maier, G., additional, McCann, A., additional, Moriarty, P., additional, Mukherjee, R., additional, Nieto, D., additional, O’Brien, S., additional, Ong, R. A., additional, Otte, N., additional, Park, N., additional, Perkins, J., additional, Pichel, A., additional, Pohl, M., additional, Popkow, A., additional, Pueschel, E., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Richards, G. T., additional, Roache, E., additional, Rovero, A. C., additional, Rulten, C., additional, Sadeh, I., additional, Santander, M., additional, Sembroski, G. H., additional, Shahinyan, K., additional, Telezhinsky, I., additional, Tucci, J. V., additional, Tyler, J., additional, Wakely, S. P., additional, Weinstein, A., additional, Wilcox, P., additional, Wilhelm, A., additional, Williams, D. A., additional, Zitzer, B., additional, Razzaque, S., additional, Villata, M., additional, Raiteri, C. M., additional, Aller, H. D., additional, Aller, M. F., additional, Larionov, V. M., additional, Arkharov, A. A., additional, Blinov, D. A., additional, Efimova, N. V., additional, Grishina, T. S., additional, Hagen-Thorn, V. A., additional, Kopatskaya, E. N., additional, Larionova, L. V., additional, Larionova, E. G., additional, Morozova, D. A., additional, Troitsky, I. S., additional, Ligustri, R., additional, Calcidese, P., additional, Berdyugin, A., additional, Kurtanidze, O. M., additional, Nikolashvili, M. G., additional, Kimeridze, G. N., additional, Sigua, L. A., additional, Kurtanidze, S. O., additional, Chigladze, R. A., additional, Chen, W. P., additional, Koptelova, E., additional, Sakamoto, T., additional, Sadun, A. C., additional, Moody, J. W., additional, Pace, C., additional, Pearson, R., additional, Yatsu, Y., additional, Mori, Y., additional, Carraminyana, A., additional, Carrasco, L., additional, de la Fuente, E., additional, Norris, J. P., additional, Smith, P. S., additional, Wehrle, A., additional, Gurwell, M. A., additional, Zook, A., additional, Pagani, C., additional, Perri, M., additional, Capalbi, M., additional, Cesarini, A., additional, Krimm, H. A., additional, Kovalev, Y. Y., additional, Kovalev, Yu. A., additional, Ros, E., additional, Pushkarev, A. B., additional, Lister, M. L., additional, Sokolovsky, K. V., additional, Kadler, M., additional, Piner, G., additional, Lähteenmäki, A., additional, Tornikoski, M., additional, Angelakis, E., additional, Krichbaum, T. P., additional, Nestoras, I., additional, Fuhrmann, L., additional, Zensus, J. A., additional, Cassaro, P., additional, Orlati, A., additional, Maccaferri, G., additional, Leto, P., additional, Giroletti, M., additional, Richards, J. L., additional, Max-Moerbeck, W., additional, and Readhead, A. C. S., additional
Published: 2017
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32. Multi-wavelength observations of the flaring gamma-ray blazar 3C 66A in 2008 October

Author: Abdo, A, Ackermann, M, Ajello, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, R, Bonamente, E, Borgland, A, Bouvier, A, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, G, Cameron, R, Caraveo, P, Carrigan, S, Casandjian, J, Cavazzuti, E, Cecchi, C, Celik, O, Charles, E, Chekhtman, A, Cheung, C, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Costamante, L, Cutini, S, Davis, D, Dermer, C, De Palma, F, Digel, S, Do Couto E Silva, E, Drell, P, Dubois, R, Dumora, D, Favuzzi, C, Fegan, S, Fortin, P, Frailis, M, Fuhrmann, L, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, I, Grove, J, Guillemot, L, Guiriec, S, Hadasch, D, Hayashida, M, Hays, E, Horan, D, Hughes, R, Itoh, R, Johannesson, G, Johnson, A, Johnson, T, Johnson, W, Kamae, T, Katagiri, H, Kataoka, J, Knodlseder, J, Kuss, M, Lande, J, Latronico, L, Lee, S, Longo, F, Loparco, F, Lott, B, Lovellette, M, Lubrano, P, Makeev, A, Mazziotta, M, Mcenery, J, Mehault, J, Michelson, P, Mizuno, T, Moiseev, A, Monte, C, Monzani, M, Morselli, A, Moskalenko, I, Murgia, S, Nakamori, T, Naumann-Godo, M, Nestoras, I, Nolan, P, Norris, J, Nuss, E, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, J, Ozaki, M, Paneque, D, Panetta, J, Parent, D, Pelassa, V, Pepe, M, Pesce-Rollins, M, Piron, F, Porter, T, Raino, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Reyes, L, Ripken, J, Ritz, S, Romani, R, Roth, M, Sadrozinski, H, Sanchez, D, Sander, A, Scargle, J, Sgro, C, Shaw, M, Smith, P, Spandre, G, Spinelli, P, Strickman, M, Suson, D, Takahashi, H, Tanaka, T, Thayer, J, Thompson, D, Tibaldo, L, Torres, D, Tosti, G, Tramacere, A, Usher, T, Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, A, Wang, P, Winer, B, Wood, K, Yang, Z, Ylinen, T, Ziegler, M, Acciari, V, Aliu, E, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Bottcher, M, Boltuch, D, Bradbury, S, Buckley, J, Bugaev, V, Byrum, K, Cannon, A, Cesarini, A, Christiansen, J, Ciupik, L, Cui, W, De La Calle Perez, I, Dickherber, R, Errando, M, Falcone, A, Finley, J, Finnegan, G, Fortson, L, Furniss, A, Galante, N, Gall, D, Gillanders, G, Godambe, S, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Holder, J, Hui, C, Humensky, T, Imran, A, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, M, Lebohec, S, Maier, G, Mcarthur, S, Mccann, A, Mccutcheon, M, Moriarty, P, Mukherjee, R, Ong, R, Otte, A, Pandel, D, Perkins, J, Pichel, A, Pohl, M, Quinn, J, Ragan, K, Reynolds, P, Roache, E, Rose, H, Schroedter, M, Sembroski, G, Senturk, G, Smith, A, Steele, D, Swordy, S, Tesic, G, Theiling, M, Thibadeau, S, Varlotta, A, Vassiliev, V, Vincent, S, Wakely, S, Ward, J, Weekes, T, Weinstein, A, Weisgarber, T, Williams, D, Wissel, S, Wood, M, Villata, M, Raiteri, C, Gurwell, M, Larionov, V, Kurtanidze, O, Aller, M, Lahteenmaki, A, Chen, W, Berduygin, A, Agudo, I, Aller, H, Arkharov, A, Bach, U, Bachev, R, Beltrame, P, Benitez, E, Buemi, C, Dashti, J, Calcidese, P, Capezzali, D, Carosati, D, Da Rio, D, Di Paola, A, Diltz, C, Dolci, M, Dultzin, D, Forne, E, Gomez, J, Hagen-Thorn, V, Halkola, A, Heidt, J, Hiriart, D, Hovatta, T, Hsiao, H, Jorstad, S, Kimeridze, G, Konstantinova, T, Kopatskaya, E, Koptelova, E, Leto, P, Ligustri, R, Lindfors, E, Lopez, J, Marscher, A, Mommert, M, Mujica, R, Nikolashvili, M, Nilsson, K, Palma, N, Pasanen, M, Roca-Sogorb, M, Ros, J, Roustazadeh, P, Sadun, A, Saino, J, Sigua, L, Sillanaa, A, Sorcia, M, Takalo, L, Tornikoski, M, Trigilio, C, Turchetti, R, Umana, G, Belloni, T, Blake, C, Bloom, J, Angelakis, E, Fumagalli, M, Hauser, M, Prochaska, J, Riquelme, D, Sievers, A, Starr, D, Tagliaferri, G, Ungerechts, H, Wagner, S, Zensus, J, Abdo A. A., Ackermann M., Ajello M., Baldini L., Ballet J., Barbiellini G., Bastieri D., Bechtol K., Bellazzini R., Berenji B., Blandford R. D., Bonamente E., Borgland A. W., Bouvier A., Bregeon J., Brez A., Brigida M., Bruel P., Buehler R., Buson S., Caliandro G. A., Cameron R. A., Caraveo P. A., Carrigan S., Casandjian J. M., Cavazzuti E., Cecchi C., Celik O., Charles E., Chekhtman A., Cheung C. C., Chiang J., Ciprini S., Claus R., Cohen-Tanugi J., Conrad J., Costamante L., Cutini S., Davis D. S., Dermer C. D., De Palma F., Digel S. W., Do Couto E Silva E., Drell P. S., Dubois R., Dumora D., Favuzzi C., Fegan S. J., Fortin P., Frailis M., Fuhrmann L., Fukazawa Y., Funk S., Fusco P., Gargano F., Gasparrini D., Gehrels N., Germani S., Giglietto N., Giommi P., Giordano F., Giroletti M., Glanzman T., Godfrey G., Grenier I. A., Grove J. E., Guillemot L., Guiriec S., Hadasch D., Hayashida M., Hays E., Horan D., Hughes R. E., Itoh R., Johannesson G., Johnson A. S., Johnson T. J., Johnson W. N., Kamae T., Katagiri H., Kataoka J., Knodlseder J., Kuss M., Lande J., Latronico L., Lee S. -H., Longo F., Loparco F., Lott B., Lovellette M. N., Lubrano P., Makeev A., Mazziotta M. N., McEnery J. E., Mehault J., Michelson P. F., Mizuno T., Moiseev A. A., Monte C., Monzani M. E., Morselli A., Moskalenko I. V., Murgia S., Nakamori T., Naumann-Godo M., Nestoras I., Nolan P. L., Norris J. P., Nuss E., Ohsugi T., Okumura A., Omodei N., Orlando E., Ormes J. F., Ozaki M., Paneque D., Panetta J. H., Parent D., Pelassa V., Pepe M., Pesce-Rollins M., Piron F., Porter T. A., Raino S., Rando R., Razzano M., Reimer A., Reimer O., Reyes L. C., Ripken J., Ritz S., Romani R. W., Roth M., Sadrozinski H. F. -W., Sanchez D., Sander A., Scargle J. D., Sgro C., Shaw M. S., Smith P. D., Spandre G., Spinelli P., Strickman M. S., Suson D. J., Takahashi H., Tanaka T., Thayer J. B., Thayer J. G., Thompson D. J., Tibaldo L., Torres D. F., Tosti G., Tramacere A., Usher T. L., Vandenbroucke J., Vasileiou V., Vilchez N., Vitale V., Waite A. P., Wang P., Winer B. L., Wood K. S., Yang Z., Ylinen T., Ziegler M., Acciari V. A., Aliu E., Arlen T., Aune T., Beilicke M., Benbow W., Bottcher M., Boltuch D., Bradbury S. M., Buckley J. H., Bugaev V., Byrum K., Cannon A., Cesarini A., Christiansen J. L., Ciupik L., Cui W., De La Calle Perez I., Dickherber R., Errando M., Falcone A., Finley J. P., Finnegan G., Fortson L., Furniss A., Galante N., Gall D., Gillanders G. H., Godambe S., Grube J., Guenette R., Gyuk G., Hanna D., Holder J., Hui C. M., Humensky T. B., Imran A., Kaaret P., Karlsson N., Kertzman M., Kieda D., Konopelko A., Krawczynski H., Krennrich F., Lang M. J., LeBohec S., Maier G., McArthur S., McCann A., McCutcheon M., Moriarty P., Mukherjee R., Ong R. A., Otte A. N., Pandel D., Perkins J. S., Pichel A., Pohl M., Quinn J., Ragan K., Reynolds P. T., Roache E., Rose H. J., Schroedter M., Sembroski G. H., Senturk G. D., Smith A. W., Steele D., Swordy S. P., Tesic G., Theiling M., Thibadeau S., Varlotta A., Vassiliev V. V., Vincent S., Wakely S. P., Ward J. E., Weekes T. C., Weinstein A., Weisgarber T., Williams D. A., Wissel S., Wood M., Villata M., Raiteri C. M., Gurwell M. A., Larionov V. M., Kurtanidze O. M., Aller M. F., Lahteenmaki A., Chen W. P., Berduygin A., Agudo I., Aller H. D., Arkharov A. A., Bach U., Bachev R., Beltrame P., Benitez E., Buemi C. S., Dashti J., Calcidese P., Capezzali D., Carosati D., Da Rio D., Di Paola A., Diltz C., Dolci M., Dultzin D., Forne E., Gomez J. L., Hagen-Thorn V. A., Halkola A., Heidt J., Hiriart D., Hovatta T., Hsiao H. -Y., Jorstad S. G., Kimeridze G. N., Konstantinova T. S., Kopatskaya E. N., Koptelova E., Leto P., Ligustri R., Lindfors E., Lopez J. M., Marscher A. P., Mommert M., Mujica R., Nikolashvili M. G., Nilsson K., Palma N., Pasanen M., Roca-Sogorb M., Ros J. A., Roustazadeh P., Sadun A. C., Saino J., Sigua L. A., Sillanaa A., Sorcia M., Takalo L. O., Tornikoski M., Trigilio C., Turchetti R., Umana G., Belloni T., Blake C. H., Bloom J. S., Angelakis E., Fumagalli M., Hauser M., Prochaska J. X., Riquelme D., Sievers A., Starr D. L., Tagliaferri G., Ungerechts H., Wagner S., Zensus J. A., Abdo, A, Ackermann, M, Ajello, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, R, Bonamente, E, Borgland, A, Bouvier, A, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, G, Cameron, R, Caraveo, P, Carrigan, S, Casandjian, J, Cavazzuti, E, Cecchi, C, Celik, O, Charles, E, Chekhtman, A, Cheung, C, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Costamante, L, Cutini, S, Davis, D, Dermer, C, De Palma, F, Digel, S, Do Couto E Silva, E, Drell, P, Dubois, R, Dumora, D, Favuzzi, C, Fegan, S, Fortin, P, Frailis, M, Fuhrmann, L, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, I, Grove, J, Guillemot, L, Guiriec, S, Hadasch, D, Hayashida, M, Hays, E, Horan, D, Hughes, R, Itoh, R, Johannesson, G, Johnson, A, Johnson, T, Johnson, W, Kamae, T, Katagiri, H, Kataoka, J, Knodlseder, J, Kuss, M, Lande, J, Latronico, L, Lee, S, Longo, F, Loparco, F, Lott, B, Lovellette, M, Lubrano, P, Makeev, A, Mazziotta, M, Mcenery, J, Mehault, J, Michelson, P, Mizuno, T, Moiseev, A, Monte, C, Monzani, M, Morselli, A, Moskalenko, I, Murgia, S, Nakamori, T, Naumann-Godo, M, Nestoras, I, Nolan, P, Norris, J, Nuss, E, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, J, Ozaki, M, Paneque, D, Panetta, J, Parent, D, Pelassa, V, Pepe, M, Pesce-Rollins, M, Piron, F, Porter, T, Raino, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Reyes, L, Ripken, J, Ritz, S, Romani, R, Roth, M, Sadrozinski, H, Sanchez, D, Sander, A, Scargle, J, Sgro, C, Shaw, M, Smith, P, Spandre, G, Spinelli, P, Strickman, M, Suson, D, Takahashi, H, Tanaka, T, Thayer, J, Thompson, D, Tibaldo, L, Torres, D, Tosti, G, Tramacere, A, Usher, T, Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, A, Wang, P, Winer, B, Wood, K, Yang, Z, Ylinen, T, Ziegler, M, Acciari, V, Aliu, E, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Bottcher, M, Boltuch, D, Bradbury, S, Buckley, J, Bugaev, V, Byrum, K, Cannon, A, Cesarini, A, Christiansen, J, Ciupik, L, Cui, W, De La Calle Perez, I, Dickherber, R, Errando, M, Falcone, A, Finley, J, Finnegan, G, Fortson, L, Furniss, A, Galante, N, Gall, D, Gillanders, G, Godambe, S, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Holder, J, Hui, C, Humensky, T, Imran, A, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, M, Lebohec, S, Maier, G, Mcarthur, S, Mccann, A, Mccutcheon, M, Moriarty, P, Mukherjee, R, Ong, R, Otte, A, Pandel, D, Perkins, J, Pichel, A, Pohl, M, Quinn, J, Ragan, K, Reynolds, P, Roache, E, Rose, H, Schroedter, M, Sembroski, G, Senturk, G, Smith, A, Steele, D, Swordy, S, Tesic, G, Theiling, M, Thibadeau, S, Varlotta, A, Vassiliev, V, Vincent, S, Wakely, S, Ward, J, Weekes, T, Weinstein, A, Weisgarber, T, Williams, D, Wissel, S, Wood, M, Villata, M, Raiteri, C, Gurwell, M, Larionov, V, Kurtanidze, O, Aller, M, Lahteenmaki, A, Chen, W, Berduygin, A, Agudo, I, Aller, H, Arkharov, A, Bach, U, Bachev, R, Beltrame, P, Benitez, E, Buemi, C, Dashti, J, Calcidese, P, Capezzali, D, Carosati, D, Da Rio, D, Di Paola, A, Diltz, C, Dolci, M, Dultzin, D, Forne, E, Gomez, J, Hagen-Thorn, V, Halkola, A, Heidt, J, Hiriart, D, Hovatta, T, Hsiao, H, Jorstad, S, Kimeridze, G, Konstantinova, T, Kopatskaya, E, Koptelova, E, Leto, P, Ligustri, R, Lindfors, E, Lopez, J, Marscher, A, Mommert, M, Mujica, R, Nikolashvili, M, Nilsson, K, Palma, N, Pasanen, M, Roca-Sogorb, M, Ros, J, Roustazadeh, P, Sadun, A, Saino, J, Sigua, L, Sillanaa, A, Sorcia, M, Takalo, L, Tornikoski, M, Trigilio, C, Turchetti, R, Umana, G, Belloni, T, Blake, C, Bloom, J, Angelakis, E, Fumagalli, M, Hauser, M, Prochaska, J, Riquelme, D, Sievers, A, Starr, D, Tagliaferri, G, Ungerechts, H, Wagner, S, Zensus, J, Abdo A. A., Ackermann M., Ajello M., Baldini L., Ballet J., Barbiellini G., Bastieri D., Bechtol K., Bellazzini R., Berenji B., Blandford R. D., Bonamente E., Borgland A. W., Bouvier A., Bregeon J., Brez A., Brigida M., Bruel P., Buehler R., Buson S., Caliandro G. A., Cameron R. A., Caraveo P. A., Carrigan S., Casandjian J. M., Cavazzuti E., Cecchi C., Celik O., Charles E., Chekhtman A., Cheung C. C., Chiang J., Ciprini S., Claus R., Cohen-Tanugi J., Conrad J., Costamante L., Cutini S., Davis D. S., Dermer C. D., De Palma F., Digel S. W., Do Couto E Silva E., Drell P. S., Dubois R., Dumora D., Favuzzi C., Fegan S. J., Fortin P., Frailis M., Fuhrmann L., Fukazawa Y., Funk S., Fusco P., Gargano F., Gasparrini D., Gehrels N., Germani S., Giglietto N., Giommi P., Giordano F., Giroletti M., Glanzman T., Godfrey G., Grenier I. A., Grove J. E., Guillemot L., Guiriec S., Hadasch D., Hayashida M., Hays E., Horan D., Hughes R. E., Itoh R., Johannesson G., Johnson A. S., Johnson T. J., Johnson W. N., Kamae T., Katagiri H., Kataoka J., Knodlseder J., Kuss M., Lande J., Latronico L., Lee S. -H., Longo F., Loparco F., Lott B., Lovellette M. N., Lubrano P., Makeev A., Mazziotta M. N., McEnery J. E., Mehault J., Michelson P. F., Mizuno T., Moiseev A. A., Monte C., Monzani M. E., Morselli A., Moskalenko I. V., Murgia S., Nakamori T., Naumann-Godo M., Nestoras I., Nolan P. L., Norris J. P., Nuss E., Ohsugi T., Okumura A., Omodei N., Orlando E., Ormes J. F., Ozaki M., Paneque D., Panetta J. H., Parent D., Pelassa V., Pepe M., Pesce-Rollins M., Piron F., Porter T. A., Raino S., Rando R., Razzano M., Reimer A., Reimer O., Reyes L. C., Ripken J., Ritz S., Romani R. W., Roth M., Sadrozinski H. F. -W., Sanchez D., Sander A., Scargle J. D., Sgro C., Shaw M. S., Smith P. D., Spandre G., Spinelli P., Strickman M. S., Suson D. J., Takahashi H., Tanaka T., Thayer J. B., Thayer J. G., Thompson D. J., Tibaldo L., Torres D. F., Tosti G., Tramacere A., Usher T. L., Vandenbroucke J., Vasileiou V., Vilchez N., Vitale V., Waite A. P., Wang P., Winer B. L., Wood K. S., Yang Z., Ylinen T., Ziegler M., Acciari V. A., Aliu E., Arlen T., Aune T., Beilicke M., Benbow W., Bottcher M., Boltuch D., Bradbury S. M., Buckley J. H., Bugaev V., Byrum K., Cannon A., Cesarini A., Christiansen J. L., Ciupik L., Cui W., De La Calle Perez I., Dickherber R., Errando M., Falcone A., Finley J. P., Finnegan G., Fortson L., Furniss A., Galante N., Gall D., Gillanders G. H., Godambe S., Grube J., Guenette R., Gyuk G., Hanna D., Holder J., Hui C. M., Humensky T. B., Imran A., Kaaret P., Karlsson N., Kertzman M., Kieda D., Konopelko A., Krawczynski H., Krennrich F., Lang M. J., LeBohec S., Maier G., McArthur S., McCann A., McCutcheon M., Moriarty P., Mukherjee R., Ong R. A., Otte A. N., Pandel D., Perkins J. S., Pichel A., Pohl M., Quinn J., Ragan K., Reynolds P. T., Roache E., Rose H. J., Schroedter M., Sembroski G. H., Senturk G. D., Smith A. W., Steele D., Swordy S. P., Tesic G., Theiling M., Thibadeau S., Varlotta A., Vassiliev V. V., Vincent S., Wakely S. P., Ward J. E., Weekes T. C., Weinstein A., Weisgarber T., Williams D. A., Wissel S., Wood M., Villata M., Raiteri C. M., Gurwell M. A., Larionov V. M., Kurtanidze O. M., Aller M. F., Lahteenmaki A., Chen W. P., Berduygin A., Agudo I., Aller H. D., Arkharov A. A., Bach U., Bachev R., Beltrame P., Benitez E., Buemi C. S., Dashti J., Calcidese P., Capezzali D., Carosati D., Da Rio D., Di Paola A., Diltz C., Dolci M., Dultzin D., Forne E., Gomez J. L., Hagen-Thorn V. A., Halkola A., Heidt J., Hiriart D., Hovatta T., Hsiao H. -Y., Jorstad S. G., Kimeridze G. N., Konstantinova T. S., Kopatskaya E. N., Koptelova E., Leto P., Ligustri R., Lindfors E., Lopez J. M., Marscher A. P., Mommert M., Mujica R., Nikolashvili M. G., Nilsson K., Palma N., Pasanen M., Roca-Sogorb M., Ros J. A., Roustazadeh P., Sadun A. C., Saino J., Sigua L. A., Sillanaa A., Sorcia M., Takalo L. O., Tornikoski M., Trigilio C., Turchetti R., Umana G., Belloni T., Blake C. H., Bloom J. S., Angelakis E., Fumagalli M., Hauser M., Prochaska J. X., Riquelme D., Sievers A., Starr D. L., Tagliaferri G., Ungerechts H., Wagner S., and Zensus J. A.
Abstract: The BL Lacertae object 3C 66A was detected in a flaring state by the Fe r m i Large Area Telescope (LAT) and VERITAS in 2008 October. In addition to these gamma-ray observations, F-GAMMA, GASP-WEBT, PAIRITEL, MDM, ATOM, Swift, and Chandra provided radio to X-ray coverage. The available light curves show variability and, in particular, correlated flares are observed in the optical and Fermi-LAT gamma-ray band. The resulting spectral energy distribution can be well fitted using standard leptonic models with and without an external radiation field for inverse Compton scattering. It is found, however, that only the model with an external radiation field can accommodate the intra-night variability observed at optical wavelengths. © 2011. The American Astronomical Society.
Published: 2011

33. Photometric rotation periods for 107 M dwarfs from the APACHE survey.

Author: Giacobbe, P, Benedetto, M, Damasso, M, Sozzetti, A, Christille, J M, Lattanzi, M G, Calcidese, P, Carbognani, A, Barbato, D, Pinamonti, M, Poggio, E, Lanza, A F, Bernagozzi, A, Cenadelli, D, Lanteri, L, and Bertolini, E
Subjects: ROTATIONAL motion, ASTRONOMICAL transits, STELLAR rotation, STELLAR mass
Abstract: We present rotation period measurements for 107 M dwarfs in the mass range |$0.15\!-\!0.70 \, \mathrm{M}_\odot$| observed within the context of the APACHE photometric survey. We measure rotation periods in the range 0.5–190 d, with the distribution peaking at ∼30 d. We revise the stellar masses and radii for our sample of rotators by exploiting the Gaia DR2 data. For |${\sim}20{{\ \rm per\ cent}}$| of the sample, we compare the photometric rotation periods with those derived from different spectroscopic indicators, finding good correspondence in most cases. We compare our rotation periods distribution to the one obtained by the Kepler survey in the same mass range, and to that derived by the MEarth survey for stars in the mass range |$0.07\!-\!0.25 \, \mathrm{M}_\odot$|⁠. The APACHE and Kepler periods distributions are in good agreement, confirming the reliability of our results, while the APACHE distribution is consistent with the MEarth result only for the older/slow rotators, and in the overlapping mass range of the two surveys. Combining the APACHE/ Kepler distribution with the MEarth distribution, we highlight that the rotation period increases with decreasing stellar mass, in agreement with previous work. Our findings also suggest that the spin-down time scale, from fast to slow rotators, changes crossing the fully convective limit at |${\approx}0.3 \, \mathrm{M}_\odot$| for M dwarfs. The catalogue of 107 rotating M dwarfs presented here is particularly timely, as the stars are prime targets for the potential identification of transiting small planets with TESS and amenable to high-precision mass determination and further atmospheric characterization measurements. [ABSTRACT FROM AUTHOR]
Published: 2020
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34. Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013–2017.

Author: D'Ammando, F, Raiteri, C M, Villata, M, Acosta-Pulido, J A, Agudo, I, Arkharov, A A, Bachev, R, Baida, G V, Benítez, E, Borman, G A, Boschin, W, Bozhilov, V, Butuzova, M S, Calcidese, P, Carnerero, M I, Carosati, D, Casadio, C, Castro-Segura, N, Chen, W-P, and Damljanovic, G
Subjects: APARTMENT buildings, QUASARS, GEOMETRIC modeling, RADIOS, BEHAVIOR, FLUX (Energy)
Abstract: We present a multiwavelength study of the flat-spectrum radio quasar CTA 102 during 2013–2017. We use radio-to-optical data obtained by the Whole Earth Blazar Telescope, 15 GHz data from the Owens Valley Radio Observatory, 91 and 103 GHz data from the Atacama Large Millimeter Array, near-infrared data from the Rapid Eye Monitor telescope, as well as data from the Swift (optical-UV and X-rays) and Fermi (γ-rays) satellites to study flux and spectral variability and the correlation between flux changes at different wavelengths. Unprecedented γ-ray flaring activity was observed during 2016 November–2017 February, with four major outbursts. A peak flux of (2158 ± 63) × 10−8 ph cm−2 s−1, corresponding to a luminosity of (2.2 ± 0.1) × 1050 erg s−1, was reached on 2016 December 28. These four γ-ray outbursts have corresponding events in the near-infrared, optical, and UV bands, with the peaks observed at the same time. A general agreement between X-ray and γ-ray activity is found. The γ-ray flux variations show a general, strong correlation with the optical ones with no time lag between the two bands and a comparable variability amplitude. This γ-ray/optical relationship is in agreement with the geometrical model that has successfully explained the low-energy flux and spectral behaviour, suggesting that the long-term flux variations are mainly due to changes in the Doppler factor produced by variations of the viewing angle of the emitting regions. The difference in behaviour between radio and higher energy emission would be ascribed to different viewing angles of the jet regions producing their emission. [ABSTRACT FROM AUTHOR]
Published: 2019
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35. The WEBT campaign on the BL Lac object PG 1553+113 in 2013. An analysis of the enigmatic synchrotron emission

Author: Raiteri, C. M., Stamerra, A., Villata, M., Larionov, V. M., Acosta-Pulido, J. A., Arévalo, M. J., Arkharov, A. A., Bachev, R., Benítez, E., Bozhilov, V. V., Borman, G. A., Buemi, C. S., Calcidese, P., Carnerero, M. I., Carosati, D., Chigladze, R. A., Damljanovic, G., Di Paola, A., Doroshenko, V. T., Efimova, N. V., Ehgamberdiev, Sh. A., Giroletti, M., González-Morales, P. A., Grinon-Marin, A. B., Grishina, T. S., Hiriart, D., Ibryamov, S., Klimanov, S. A., Kopatskaya, E. N., Kurtanidze, O. M., Kurtanidze, S. O., Kurtenkov, A. A., Larionova, L. V., Larionova, E. G., Lázaro, C., Lähteenmäki, A., Leto, P., Markovic, G., Mirzaqulov, D. O., Mokrushina, A. A., Morozova, D. A., Mújica, R., Nazarov, S. V., Nikolashvili, M. G., Ohlert, J. M., Ovcharov, E. P., Paiano, S., Pastor Yabar, A., Prandini, E., Ramakrishnan, V., Sadun, A. C., Semkov, E., Sigua, L. A., Strigachev, A., Tammi, J., Tornikoski, M., Trigilio, C., Troitskaya, Yu. V., Troitsky, I. S., Umana, G., Velasco, S., Vince, O., Raiteri, C. M., Stamerra, A., Villata, M., Larionov, V. M., Acosta-Pulido, J. A., Arévalo, M. J., Arkharov, A. A., Bachev, R., Benítez, E., Bozhilov, V. V., Borman, G. A., Buemi, C. S., Calcidese, P., Carnerero, M. I., Carosati, D., Chigladze, R. A., Damljanovic, G., Di Paola, A., Doroshenko, V. T., Efimova, N. V., Ehgamberdiev, Sh. A., Giroletti, M., González-Morales, P. A., Grinon-Marin, A. B., Grishina, T. S., Hiriart, D., Ibryamov, S., Klimanov, S. A., Kopatskaya, E. N., Kurtanidze, O. M., Kurtanidze, S. O., Kurtenkov, A. A., Larionova, L. V., Larionova, E. G., Lázaro, C., Lähteenmäki, A., Leto, P., Markovic, G., Mirzaqulov, D. O., Mokrushina, A. A., Morozova, D. A., Mújica, R., Nazarov, S. V., Nikolashvili, M. G., Ohlert, J. M., Ovcharov, E. P., Paiano, S., Pastor Yabar, A., Prandini, E., Ramakrishnan, V., Sadun, A. C., Semkov, E., Sigua, L. A., Strigachev, A., Tammi, J., Tornikoski, M., Trigilio, C., Troitskaya, Yu. V., Troitsky, I. S., Umana, G., Velasco, S., and Vince, O.
Abstract: A multifrequency campaign on the BL Lac object PG 1553+113 was organized by the Whole Earth Blazar Telescope (WEBT) in 2013 April-August, involving 19 optical, two near-IR, and three radio telescopes. The aim was to study the source behaviour at low energies during and around the high-energy observations by the Major Atmospheric Gamma-ray Imaging Cherenkov telescopes in April-July. We also analyse the UV and X-ray data acquired by the Swift and XMM-Newton satellites in the same period. The WEBT and satellite observations allow us to detail the synchrotron emission bump in the source spectral energy distribution (SED). In the optical, we found a general bluer-when-brighter trend. The X-ray spectrum remained stable during 2013, but a comparison with previous observations suggests that it becomes harder when the X-ray flux increases. The long XMM-Newton exposure reveals a curved X-ray spectrum. In the SED, the XMM-Newton data show a hard near-UV spectrum, while Swift data display a softer shape that is confirmed by previous Hubble Space Telescope/Cosmic Origins Spectrograph and International Ultraviolet Explorer observations. Polynomial fits to the optical-X-ray SED show that the synchrotron peak likely lies in the 4-30eV energy range, with a general shift towards higher frequencies for increasing X-ray brightness. However, the UV and X-ray spectra do not connect smoothly. Possible interpretations include: (i) orientation effects, (ii) additional absorption, (iii) multiple emission components, and (iv) a peculiar energy distribution of relativistic electrons. We discuss the first possibility in terms of an inhomogeneous helical jet model
Published: 2017

36. MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER (vol 726, pg 43, 2011)

Author: Abdo, Aa, Ackermann, M, Ajello, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, Rd, Bonamente, E, Borgland, Aw, Bouvier, A, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, Ga, Cameron, Ra, Caraveo, Pa, Carrigan, S, Casandjian, Jm, Cavazzuti, E, Cecchi, C, Celik, O, Charles, E, Chekhtman, A, Cheung, Cc, Chiang, J, Ciprini, S, Claus, R, Cohen Tanugi, J, Conrad, J, Costamante, L, Cutini, S, Davis, Ds, Dermer, Cd, de Palma, F, Digel, Sw, Silva, Ede, Drell, Ps, Dubois, R, Dumora, D, Favuzzi, Cecilia, Fegan, Sj, Fortin, P, Frailis, M, Fuhrmann, L, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, Nicola, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, Ia, Grove, Je, Guillemot, L, Guiriec, S, Hadasch, D, Hayashida, M, Hays, E, Horan, D, Hughes, Re, Itoh, R, Johannesson, G, Johnson, As, Johnson, Tj, Johnson, Wn, Kamae, T, Katagiri, H, Kataoka, J, Knodlseder, J, Kuss, M, Lande, J, Latronico, L, Lee, Sh, Longo, F, Loparco, F, Lott, B, Lovellette, Mn, Lubrano, P, Makeev, A, Mazziotta, Mn, Mcenery, Je, Mehault, J, Michelson, Pf, Mizuno, T, Moiseev, Aa, Monte, C, Monzani, Me, Morselli, A, Moskalenko, Iv, Murgia, S, Nakamori, T, Naumann Godo, M, Nestoras, I, Nolan, Pl, Norris, Jp, Nuss, E, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, Jf, Ozaki, M, Paneque, D, Panetta, Jh, Parent, D, Pelassa, V, Pepe, M, Pesce Rollins, M, Piron, F, Porter, Ta, Raino, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Reyes, Lc, Ripken, J, Ritz, S, Romani, Rw, Roth, M, Sadrozinski, Hfw, Sanchez, D, Sander, A, Scargle, Jd, Sgro, C, Shaw, Ms, Smith, Pd, Spandre, G, Spinelli, P, Strickman, Ms, Suson, Dj, Takahashi, H, Tanaka, T, Thayer, Jb, Thayer, Jg, Thompson, Dj, Tibaldo, L, Torres, Df, Tosti, G, Tramacere, A, Usher, Tl, Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, Ap, Wang, P, Winer, Bl, Wood, Ks, Yang, Z, Ylinen, T, Ziegler, M, Acciari, Va, Aliu, E, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Bottcher, M, Boltuch, D, Bradbury, Sm, Buckley, Jh, Bugaev, V, Byrum, K, Cannon, A, Cesarini, A, Christiansen, Jl, Ciupik, L, Cui, W, Perez, Id, Dickherber, R, Errando, M, Falcone, A, Finley, Jp, Finnegan, G, Fortson, L, Furniss, A, Galante, N, Gall, D, Gillanders, Gh, Godambe, S, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Holder, J, Hui, Cm, Humensky, Tb, Imran, A, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, Mj, Lebohec, S, Maier, G, Mcarthur, S, Mccann, A, Mccutcheon, M, Moriarty, P, Mukherjee, R, Ong, Ra, Otte, An, Pandel, D, Perkins, Js, Pichel, A, Pohl, M, Quinn, J, Ragan, K, Reynolds, Pt, Roache, E, Rose, Hj, Schroedter, M, Sembroski, Gh, Senturk, Gd, Smith, Aw, Steele, D, Swordy, Sp, Tesic, G, Theiling, M, Thibadeau, S, Varlotta, A, Vassiliev, Vv, Vincent, S, Wakely, Sp, Ward, Je, Weekes, Tc, Weinstein, A, Weisgarber, T, Williams, Da, Wissel, S, Wood, M, Villata, M, Raiteri, Cm, Gurwell, Ma, Larionov, Vm, Kurtanidze, Om, Aller, Mf, Lahteenmaki, A, Chen, Wp, Berduygin, A, Agudo, I, Aller, Hd, Arkharov, Aa, Bach, U, Bachev, R, Beltrame, P, Benitez, E, Buemi, Cs, Dashti, J, Calcidese, P, Capezzali, D, Carosati, D, Da Rio, D, Di Paola, A, Diltz, C, Dolci, M, Dultzin, D, Forne, E, Gomez, Jl, Hagen Thorn VA, Halkola, A, Heidt, J, Hiriart, D, Hovatta, T, Hsiao, Hy, Jorstad, Sg, Kimeridze, Gn, Konstantinova, Ts, Kopatskaya, En, Koptelova, E, Leto, P, Ligustri, R, Lindfors, E, Lopez, Jm, Marscher, Ap, Mommert, M, Mujica, R, Nikolashvili, Mg, Nilsson, K, Palma, N, Pasanen, M, Roca Sogorb, M, Ros, Ja, Roustazadeh, P, Sadun, Ac, Saino, J, Sigua, La, Sillanaa, A, Sorcia, M, Takalo, Lo, Tornikoski, M, Trigilio, C, Turchetti, R, Umana, G, Belloni, T, Blake, Ch, Bloom, Js, Angelakis, E, Fumagalli, M, Hauser, M, Prochaska, Jx, Riquelme, D, Sievers, A, Starr, Dl, Tagliaferri, G, Ungerechts, H, Wagner, S, Zensus, Ja, Abdo, A. A., Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bonamente, E., Borgland, A. W., Bouvier, A., Bregeon, J., Brez, A., Brigida, M., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carrigan, S., Casandjian, J. M., Cavazzuti, E., Cecchi, C., Celik, Oe., Charles, E., Chekhtman, A., Cheung, C. C., Chiang, J., Ciprini, S., Claus, R., Cohen-Tanugi, J., Conrad, J., Costamante, L., Cutini, S., Davis, D. S., Dermer, C. D., de Palma, F., Digel, S. W., do Couto e Silva, E., Drell, P. S., Dubois, R., Dumora, D., Favuzzi, C., Fegan, S. J., Fortin, P., Frailis, M., Fuhrmann, L., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Grove, J. E., Guillemot, L., Guiriec, S., Hadasch, D., Hayashida, M., Hays, E., Horan, D., Hughes, R. E., Itoh, R., Johannesson, G., Johnson, A. S., Johnson, T. J., Johnson, W. N., Kamae, T., Katagiri, H., Kataoka, J., Knoedlseder, J., Kuss, M., Lande, J., Latronico, L., Lee, S. -H., Longo, F., Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Makeev, A., Mazziotta, M. N., Mcenery, J. E., Mehault, J., Michelson, P. F., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Naumann-Godo, M., Nestoras, I., Nolan, P. L., Norris, J. P., Nuss, E., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E, Ormes, J. F., Ozaki, M., Paneque, D., Panetta, J. H., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Piron, F., Porter, T. A., Raino, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Reyes, L. C., Ripken, J., Ritz, S., Romani, R. W., Roth, M., Sadrozinski, H. F. -W., Sanchez, D., Sander, A., Scargle, J. D., Sgro, C., Shaw, M. S., Smith, P. D., Spandre, G., Spinelli, P., Strickman, M. S., Suson, D. J., Takahashi, H., Tanaka, T., Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L., Torres, D. F., Tosti, G., Tramacere, A., Usher, T. L., Vandenbroucke, J., Vasileiou, V., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, K. S., Yang, Z., Ylinen, T., Ziegler, M., Acciari, V. A., Aliu, E., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Boettcher, M., Boltuch, D., Bradbury, S. M., Buckley, J. H., Bugaev, V., Byrum, K., Cannon, A., Cesarini, A., Christiansen, J. L., Ciupik, L., Cui, W., de la Calle Perez, I., Dickherber, R., Errando, M., Falcone, A., Finley, J. P., Finnegan, G., Fortson, L., Furniss, A., Galante, N., Gall, D., Gillanders, G. H., Godambe, S., Grube, J., Guenette, R., Gyuk, G., Hanna, D., Holder, J., Hui, C. M., Humensky, T. B., Imran, A., Kaaret, P., Karlsson, N., Kertzman, M., Kieda, D., Konopelko, A., Krawczynski, H., Krennrich, F., Lang, M. J., Lebohec, S., Maier, G., Mcarthur, S., Mccann, A., Mccutcheon, M., Moriarty, P., Mukherjee, R., Ong, R. A., Otte, A. N., Pandel, D., Perkins, J. S., Pichel, A., Pohl, M., Quinn, J., Ragan, K., Reynolds, P. T., Roache, E., Rose, H. J., Schroedter, M., Sembroski, G. H., Senturk G., Demet, Smith, A. W., Steele, D., Swordy, S. P., Tesic, G., Theiling, M., Thibadeau, S., Varlotta, A., Vassiliev, V. V., Vincent, S., Wakely, S. P., Ward, J. E., Weekes, T. C., Weinstein, A., Weisgarber, T., Williams, D. A., Wissel, S., Wood, M., Villata, M., Raiteri, C. M., Gurwell, M. A., Larionov, V. M., Kurtanidze, O. M., Aller, M. F., Laehteenmaeki, A., Chen, W. P., Berduygin, A., Agudo, I., Aller, H. D., Arkharov, A. A., Bach, U., Bachev, R., Beltrame, P., Benitez, E., Buemi, C. S., Dashti, J., Calcidese, P., Capezzali, D., Carosati, D., Da Rio, D., Di Paola, A., Diltz, C., Dolci, M., Dultzin, D., Forne, E., Gomez, J. L., Hagen-Thorn, V. A., Halkola, A., Heidt, J., Hiriart, D., Hovatta, T., Hsiao, H. -Y., Jorstad, S. G., Kimeridze, G. N., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E., Leto, P., Ligustri, R., Lindfors, E., Lopez, J. M., Marscher, A. P., Mommert, M., Mujica, R., Nikolashvili, M. G., Nilsson, K., Palma, N., Pasanen, M., Roca-Sogorb, M., Ros, J. A., Roustazadeh, P., Sadun, A. C., Saino, J., Sigua, L. A., Sillanaa, A., Sorcia, M., Takalo, L. O., Tornikoski, M., Trigilio, C., Turchetti, R., Umana, G., Belloni, T., Blake, C. H., Bloom, J. S., Angelakis, E., Fumagalli, M., Hauser, M., Prochaska, J. X., Riquelme, D., Sievers, A., Starr, D. L., Tagliaferri, G., Ungerechts, H., Wagner, S., and Zensus, J. A.
Published: 2011

37. New Variable Stars Discovered by the APACHE Survey. II. Results After the Second Observing Season

Author: Mario Damasso, Gioannini, L., Bernagozzi, A., Bertolini, E., Calcidese, P., Carbognani, Albino, Cenadelli, D., Christille, J. -M, Paolo Giacobbe, Luciano Lanteri, Mario Gilberto Lattanzi, Richard Smart, Alessandro Sozzetti, and ITA
Abstract: Routinely operating since July 2012, the APACHE survey has celebrated its second birthday. While the main goal of the project is the detection of transiting planets around a large sample of bright, nearby M dwarfs in the northern hemisphere, the APACHE large photometric database, consisting of hundreds of different fields, represents a relevant resource to search for and provide a first characterization of new variable stars. We celebrate here the conclusion of the second year of observations by reporting the discovery of 14 new variables.
Published: 2015

38. The 72-h WEBT microvariability observation of blazar S5 0716 + 714 in 2009

Author: Bhatta G., Webb J., Hollingsworth H., Dhalla S., Khanuja A., Bachev R., Blinov D., Bottcher M., Bravo Calle O., Calcidese P., Capezzali D., Carosati D., Chigladze R., Collins A., Coloma J., Efimov Y., Gupta A., Hu S., Kurtanidze O., Lamerato A., Larionov V., Lee C., Lindfors E., Murphy B., Nilsson K., Ohlert J., Oksanen A., Pääkkönen P., Pollock J., Rani B., Reinthal R., Rodriguez D., Ros J., Roustazadeh P., Sagar R., Sanchez A., Shastri P., Sillanpää A., Strigachev A., Takalo L., Vennes S., Villata M., Villforth C., Wu J., and Zhou X.
Subjects: individual: S5 0716+714 [Quasars], individual: S5 0716+714 [BL Lacertae objects]
Abstract: Context. The international Whole Earth Blazar Telescope (WEBT) consortium planned and carried out three days of intensive micro-variability observations of S5 0716 + 714 from February 22, 2009 to February 25, 2009. This object was chosen due to its bright apparent magnitude range, its high declination, and its very large duty cycle for micro-variations. Aims. We report here on the long continuous optical micro-variability light curve of 0716+714 obtained during the multi-site observing campaign during which the Blazar showed almost constant variability over a 0.5 mag range. The resulting light curve is presented here for the first time. Observations from participating observatories were corrected for instrumental differences and combined to construct the overall smoothed light curve. Methods. Thirty-six observatories in sixteen countries participated in this continuous monitoring program and twenty of them submitted data for compilation into a continuous light curve. The light curve was analyzed using several techniques including Fourier transform, Wavelet and noise analysis techniques. Those results led us to model the light curve by attributing the variations to a series of synchrotron pulses. Results. We have interpreted the observed microvariations in this extended light curve in terms of a new model consisting of individual stochastic pulses due to cells in a turbulent jet which are energized by a passing shock and cool by means of synchrotron emission. We obtained an excellent fit to the 72-hour light curve with the synchrotron pulse model. © ESO, 2013.
Published: 2013

39. VSX J071108.7+695227: a Newly Discovered Short-period Eclipsing Binary

Author: Damasso, Mario, Cenadelli, D., Calcidese, P., Luca Borsato, Valentina GRANATA, and Valerio Nascimbeni
Published: 2012

40. ERRATUM: MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER (vol 726, pg 43, 2011)

Author: Abdo, Aa, Ackermann, M, Ajello, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, Denis, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, Rd, Bonamente, E, Borgland, Aw, Bouvier, A, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Buehler, R, Buson, Sara, Caliandro, Ga, Cameron, Ra, Caraveo, Pa, Carrigan, S, Casandjian, Jm, Cavazzuti, E, Cecchi, C, Celik, O, Charles, E, Chekhtman, A, Cheung, Cc, Chiang, J, Ciprini, S, Claus, R, COHEN TANUGI, J, Conrad, J, Costamante, L, Cutini, S, Davis, Ds, Dermer, Cd, DE PALMA, F, Digel, Sw, Silva, Ede, Drell, Ps, Dubois, R, Dumora, D, Favuzzi, C, Fegan, Sj, Fortin, P, Frailis, M, Fuhrmann, L, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, Ia, Grove, Je, Guillemot, L, Guiriec, S, Hadasch, D, Hayashida, M, Hays, E, Horan, D, Hughes, Re, Itoh, R, Johannesson, G, Johnson, As, Johnson, Tj, Johnson, Wn, Kamae, T, Katagiri, H, Kataoka, J, Knodlseder, J, Kuss, M, Lande, J, Latronico, L, Lee, Sh, Longo, F, Loparco, F, Lott, B, Lovellette, Mn, Lubrano, P, Makeev, A, Mazziotta, Mn, Mcenery, Je, Mehault, J, Michelson, Pf, Mizuno, T, Moiseev, Aa, Monte, C, Monzani, Me, Morselli, A, Moskalenko, Iv, Murgia, S, Nakamori, T, NAUMANN GODO, M, Nestoras, I, Nolan, Pl, Norris, Jp, Nuss, E, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, Jf, Ozaki, M, Paneque, D, Panetta, Jh, Parent, D, Pelassa, V, Pepe, M, PESCE ROLLINS, M, Piron, F, Porter, Ta, Raino, S, Rando, Riccardo, Razzano, M, Reimer, A, Reimer, O, Reyes, Lc, Ripken, J, Ritz, S, Romani, Rw, Roth, M, Sadrozinski, Hfw, Sanchez, D, Sander, A, Scargle, Jd, Sgro, C, Shaw, Ms, Smith, Pd, Spandre, G, Spinelli, P, Strickman, Ms, Suson, Dj, Takahashi, H, Tanaka, T, Thayer, Jb, Thayer, Jg, Thompson, Dj, Tibaldo, Luigi, Torres, Df, Tosti, G, Tramacere, A, Usher, Tl, Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, Ap, Wang, P, Winer, Bl, Wood, Ks, Yang, Z, Ylinen, T, Ziegler, M, Acciari, Va, Aliu, E, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Bottcher, M, Boltuch, D, Bradbury, Sm, Buckley, Jh, Bugaev, V, Byrum, K, Cannon, A, Cesarini, A, Christiansen, Jl, Ciupik, L, Cui, W, Perez, Id, Dickherber, R, Errando, M, Falcone, A, Finley, Jp, Finnegan, G, Fortson, L, Furniss, A, Galante, N, Gall, D, Gillanders, Gh, Godambe, S, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Holder, J, Hui, Cm, Humensky, Tb, Imran, A, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, Mj, Lebohec, S, Maier, G, Mcarthur, S, Mccann, A, Mccutcheon, M, Moriarty, P, Mukherjee, R, Ong, Ra, Otte, An, Pandel, D, Perkins, Js, Pichel, A, Pohl, M, Quinn, J, Ragan, K, Reynolds, Pt, Roache, E, Rose, Hj, Schroedter, M, Sembroski, Gh, Senturk, Gd, Smith, Aw, Steele, D, Swordy, Sp, Tesic, G, Theiling, M, Thibadeau, S, Varlotta, A, Vassiliev, Vv, Vincent, S, Wakely, Sp, Ward, Je, Weekes, Tc, Weinstein, A, Weisgarber, T, Williams, Da, Wissel, S, Wood, M, Villata, M, Raiteri, Cm, Gurwell, Ma, Larionov, Vm, Kurtanidze, Om, Aller, Mf, Lahteenmaki, A, Chen, Wp, Berduygin, A, Agudo, I, Aller, Hd, Arkharov, Aa, Bach, U, Bachev, R, Beltrame, P, Benitez, E, Buemi, Cs, Dashti, J, Calcidese, P, Capezzali, D, Carosati, D, DA RIO, D, DI PAOLA, A, Diltz, C, Dolci, M, Dultzin, D, Forne, E, Gomez, Jl, HAGEN THORN VA, Halkola, A, Heidt, J, Hiriart, D, Hovatta, T, Hsiao, Hy, Jorstad, Sg, Kimeridze, Gn, Konstantinova, Ts, Kopatskaya, En, Koptelova, E, Leto, P, Ligustri, R, Lindfors, E, Lopez, Jm, Marscher, Ap, Mommert, M, Mujica, R, Nikolashvili, Mg, Nilsson, K, Palma, N, Pasanen, M, ROCA SOGORB, M, Ros, Ja, Roustazadeh, P, Sadun, Ac, Saino, J, Sigua, La, Sillanaa, A, Sorcia, M, Takalo, Lo, Tornikoski, M, Trigilio, C, Turchetti, R, Umana, G, Belloni, T, Blake, Ch, Bloom, Js, Angelakis, E, Fumagalli, M, Hauser, M, Prochaska, Jx, Riquelme, D, Sievers, A, Starr, Dl, Tagliaferri, G, Ungerechts, H, Wagner, S, and Zensus, Ja
Published: 2011

41. The long-lasting activity of . GASP-WEBT and satellite observations in 2008-2010

Author: Raiteri, C, Villata, M, Aller, M, Gurwell, M, Kurtanidze, O, Lahteenmaki, A, Larionov, V, Romano, P, Vercellone, S, Agudo, I, Aller, H, Arkharov, A, Bach, U, Ben#236, Tez, E, Berdyugin, A, Blinov, D, Borisova, E, Bottcher, M, Bravo Calle, O, Buemi, C, Calcidese, P, Carosati, D, Casas, R, Chen, W, Efimova, N, G#242, Mez, J, Gusbar, C, Hawkins, K, Heidt, J, Hiriart, D, Hsiao, H, Jordan, B, Jorstad, S, Joshi, M, Kimeridze, G, Koptelova, E, Konstantinova, T, Kopatskaya, E, Kurtanidze, S, Larionova, E, Larionova, L, Leto, P, Li, Y, Ligustri, R, Lindfors, E, Lister, M, Marscher, A, Molina, S, Morozova, D, Nieppola, E, Nikolashvili, M, Nilsson, K, Palma, N, Pasanen, M, Reinthal, R, Roberts, V, Ros, J, Roustazadeh, P, Sadun, A, Sakamoto, T, Schwartz, R, Sigua, L, Sillanpaa, A, Takalo, L, Tammi, J, Taylor, B, Tornikoski, M, Trigilio, Corrado, Troitsky, I, Umana, G, Volvach, A, and Yuldasheva, T.
Published: 2011

42. Erratum: 'Multi-wavelength Observations of the Flaring Gamma-ray Blazar 3C 66A in 2008 October'

Author: Abdo, A. A., Ackermann, M, Ajello, M, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, R. D., Bonamente, E, Borgland, A. W., Bouvier, A, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Carrigan, S, Casandjian, J. M., Cavazzuti, E, Cecchi, C, Çelik, Ö, Charles, E, Chekhtman, A, Cheung, C. C., Chiang, J, Ciprini, S, Claus, R, Cohen Tanugi, J, Conrad, J, Costamante, L, Cutini, S, Davis, D. S., Dermer, C. D., de Palma, F, Digel, S. W., do Couto e, Silva E., Drell, P. S., Dubois, R, Dumora, D, Favuzzi, C, Fegan, S. J., Fortin, P, Frailis, M, Fuhrmann, L, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, I. A., Grove, J. E., Guillemot, L, Guiriec, S, Hadasch, D, Hayashida, M, Hays, E, Horan, D, Hughes, R. E., Itoh, R, Jòhannesson, G, Johnson, A. S., Johnson, T. J., Johnson, W. N., Kamae, T, Katagiri, H, Kataoka, J, Knödlseder, J, Kuss, M, Lande, J, Latronico, L, Lee, S. H., Longo, F, Loparco, F, Lott, B, Lovellette, M. N., Lubrano, P, Makeev, A, Mazziotta, M. N., Mcenery, J. E., Mehault, J, Michelson, P. F., Mizuno, T, Moiseev, A. A., Monte, C, Monzani, M. E., Morselli, A, Moskalenko, I. V., Murgia, S, Nakamori, T, Naumann Godo, M, Nestoras, I, Nolan, P. L., Norris, J. P., Nuss, E, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, J. F., Ozaki, M, Paneque, D, Panetta, J. H., Parent, D, Pelassa, V, Pepe, M, Pesce Rollins, M, Piron, F, Porter, T. A., Rainò, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Reyes, L. C., Ripken, J, Ritz, S, Romani, R. W., Roth, M, Sadrozinski, H. F. W., Sanchez, D, Sander, A, Scargle, J. D., Sgrò, C, Shaw, M. S., Smith, P. D., Spandre, G, Spinelli, P, Strickman, M. S., Suson, D. J., Takahashi, H, Tanaka, T, Thayer, J. B., Thayer, J. G., Thompson, D. J., Tibaldo, L, Torres, D. F., Tosti, G, Tramacere, A, Usher, T. L., Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, A. P., Wang, P, Winer, B. L., Wood, K. S., Yang, Z, Ylinen, T, Ziegler, M, The Fermi LAT Collaboration, Acciari, V. A., Aliu, E, Arlen, T, Aune, T, Beilicke, M, Benbow, W, Böttcher, M, Boltuch, D, Bradbury, S. M., Buckley, J. H., Bugaev, V, Byrum, K, Cannon, A, Cesarini, A, Christiansen, J. L., Ciupik, L, Cui, W, de la Calle Perez, I, Dickherber, R, Errando, M, Falcone, A, Finley, J. P., Finnegan, G, Fortson, L, Furniss, A, Galante, N, Gall, D, Gillanders, G. H., Godambe, S, Grube, J, Guenette, R, Gyuk, G, Hanna, D, Holder, J, Hui, C. M., Humensky, T. B., Imran, A, Kaaret, P, Karlsson, N, Kertzman, M, Kieda, D, Konopelko, A, Krawczynski, H, Krennrich, F, Lang, M. J., Lebohec, S, Maier, G, Mcarthur, S, Mccann, A, Mccutcheon, M, Moriarty, P, Mukherjee, R, Ong, R. A., Otte, A. N., Pandel, D, Perkins, J. S., Pichel, A, Pohl, M, Quinn, J, Ragan, K, Reynolds, P. T., Roache, E, Rose, H. J., Schroedter, M, Sembroski, G. H., Demet, Senturk G., Smith, A. W., Steele, D, Swordy, S. P., Tesic, G, Theiling, M, Thibadeau, S, Varlotta, A, Vassiliev, V. V., Vincent, S, Wakely, S. P., Ward, J. E., Weekes, T. C., Weinstein, A, Weisgarber, T, Williams, D. A., Wissel, S, Wood, M, The VERITAS Collaboration, Villata, M, Raiteri, C. M., Gurwell, M. A., Larionov, V. M., Kurtanidze, O. M., Aller, M. F., Lähteenmäki, A, Chen, W. P., Berduygin, A, Agudo, I, Aller, H. D., Arkharov, A. A., Bach, U, Bachev, R, Beltrame, P, Benìtez, E, Buemi, C. S., Dashti, J, Calcidese, P, Capezzali, D, Carosati, D, Da Rio, D, Di Paola, A, Diltz, C, Dolci, M, Dultzin, D, Fornè, E, Gòmez, J. L., Hagen Thorn, V. A., Halkola, A, Heidt, J, Hiriart, D, Hovatta, T, Hsiao, H. Y., Jorstad, S. G., Kimeridze, G. N., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E, Leto, P, Ligustri, R, Lindfors, E, Lopez, J. M., Marscher, A. P., Mommert, M, Mujica, R, Nikolashvili, M. G., Nilsson, K, Palma, N, Pasanen, M, Roca Sogorb, M, Ros, J. A., Roustazadeh, P, Sadun, A. C., Saino, J, Sigua, L. A., Sillanää, A, Sorcia, M, Takalo, L. O., Tornikoski, M, Trigilio, Corrado, Turchetti, R, Umana, G, GASP WEBT Consortium The, Belloni, T, Blake, C. H., Bloom, J. S., Angelakis, E, Fumagalli, M, Hauser, M, Prochaska, J. X., Riquelme, D, Sievers, A, Starr, D. L., Tagliaferri, G, Ungerechts, H, Wagner, S, and Zensus, J. A.
Published: 2011

43. The WEBT campaign on the BL Lac object PG 1553+113 in 2013. An analysis of the enigmatic synchrotron emission

Author: Raiteri, C. M., primary, Stamerra, A., additional, Villata, M., additional, Larionov, V. M., additional, Acosta-Pulido, J. A., additional, Arévalo, M. J., additional, Arkharov, A. A., additional, Bachev, R., additional, Benítez, E., additional, Bozhilov, V. V., additional, Borman, G. A., additional, Buemi, C. S., additional, Calcidese, P., additional, Carnerero, M. I., additional, Carosati, D., additional, Chigladze, R. A., additional, Damljanovic, G., additional, Di Paola, A., additional, Doroshenko, V. T., additional, Efimova, N. V., additional, Ehgamberdiev, Sh. A., additional, Giroletti, M., additional, González-Morales, P. A., additional, Grinon-Marin, A. B., additional, Grishina, T. S., additional, Hiriart, D., additional, Ibryamov, S., additional, Klimanov, S. A., additional, Kopatskaya, E. N., additional, Kurtanidze, O. M., additional, Kurtanidze, S. O., additional, Kurtenkov, A. A., additional, Larionova, L. V., additional, Larionova, E. G., additional, Lázaro, C., additional, Lähteenmäki, A., additional, Leto, P., additional, Markovic, G., additional, Mirzaqulov, D. O., additional, Mokrushina, A. A., additional, Morozova, D. A., additional, Mújica, R., additional, Nazarov, S. V., additional, Nikolashvili, M. G., additional, Ohlert, J. M., additional, Ovcharov, E. P., additional, Paiano, S., additional, Pastor Yabar, A., additional, Prandini, E., additional, Ramakrishnan, V., additional, Sadun, A. C., additional, Semkov, E., additional, Sigua, L. A., additional, Strigachev, A., additional, Tammi, J., additional, Tornikoski, M., additional, Trigilio, C., additional, Troitskaya, Yu. V., additional, Troitsky, I. S., additional, Umana, G., additional, Velasco, S., additional, and Vince, O., additional
Published: 2015
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44. The GAPS programme with HARPS-N at TNG

Author: Damasso, M., primary, Biazzo, K., additional, Bonomo, A. S., additional, Desidera, S., additional, Lanza, A. F., additional, Nascimbeni, V., additional, Esposito, M., additional, Scandariato, G., additional, Sozzetti, A., additional, Cosentino, R., additional, Gratton, R., additional, Malavolta, L., additional, Rainer, M., additional, Gandolfi, D., additional, Poretti, E., additional, Zanmar Sanchez, R., additional, Ribas, I., additional, Santos, N., additional, Affer, L., additional, Andreuzzi, G., additional, Barbieri, M., additional, Bedin, L. R., additional, Benatti, S., additional, Bernagozzi, A., additional, Bertolini, E., additional, Bonavita, M., additional, Borsa, F., additional, Borsato, L., additional, Boschin, W., additional, Calcidese, P., additional, Carbognani, A., additional, Cenadelli, D., additional, Christille, J. M., additional, Claudi, R. U., additional, Covino, E., additional, Cunial, A., additional, Giacobbe, P., additional, Granata, V., additional, Harutyunyan, A., additional, Lattanzi, M. G., additional, Leto, G., additional, Libralato, M., additional, Lodato, G., additional, Lorenzi, V., additional, Mancini, L., additional, Martinez Fiorenzano, A. F., additional, Marzari, F., additional, Masiero, S., additional, Micela, G., additional, Molinari, E., additional, Molinaro, M., additional, Munari, U., additional, Murabito, S., additional, Pagano, I., additional, Pedani, M., additional, Piotto, G., additional, Rosenberg, A., additional, Silvotti, R., additional, and Southworth, J., additional
Published: 2015
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45. Another look at the BL Lacertae flux and spectral variability. Observations by GASP-WEBT, XMM-Newton, and Swift in 2008-2009

Author: Raiteri, C, Villata, M, Bruschini, L, Capetti, A, Kurtanidze, O, Larionov, V, Romano, P, Vercellone, S, Agudo, I, Aller, H, Aller, M, Arkharov, A, Bach, U, Berdyugin, A, Blinov, D, Bottcher, M, Buemi, C, Calcidese, P, Carosati, D, Casas, R, Chen, W, Coloma, J, Diltz, C, di Paola, A, Dolci, M, Efimova, N, Forn#232, E, G#242, Mez, J, Gurwell, M, Hakola, A, Hovatta, T, Hsiao, H, Jordan, B, Jorstad, S, Koptelova, E, Kurtanidze, S, Lahteenmaki, A, Larionova, E, Leto, P, Lindfors, E, Ligustri, R, Marscher, A, Morozova, D, Nikolashvili, M, Nilsson, K, Ros, J, Roustazadeh, P, Sadun, A, Sillanpaa, A, Sainio, J, Takalo, L, Tornikoski, M, Trigilio, Corrado, Troitsky, I, and Umana, G.
Published: 2010

46. The Whole Earth Blazar Telescope Campaign on the Intermediate BL Lac Object 3C 66A in 2007-2008

Author: Böttcher, M, Fultz, K, Aller, H. D., Aller, M. F., Apodaca, J, Arkharov, A. A., Bach, U, Bache, R, Berdyugin, A, Buemi, C, Calcidese, P, Carosati, D, Charlot, P, Ciprini, S, PAOLA A., Di, Dolci, M, Efimova, N. V., Forné, SCURRATS E., Frasca, A, Gupta, A. C., HAGEN THORN, V. A., Heidt, J, Hiriart, D, Konstantinova, T. S., Kopatskaya, E. N., Lähteenmäki, A, Lanteri, L, Larionov, V. M., Lecampion, J. F., Leto, P, Lindfors, E, Mihov, E, Marilli, E, Nieppola, E, Nilsson, K, OHLERT E, OVCHAROV J. M., Pääkkönen, P, Pasanen, M, Ragozzine, B, Raiteri, C. M., Ros, J. A., Sadun, A, Sanchez, A, Semkov, E, Sorcia, M, Strigachev, A, Takalo, L, Tornikoski, M, Trigilio, Corrado, Umana, G, Valcheva, A, Villata, M, Volvach, A, J. H., Wu, Zhou, X., Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire aquitain des sciences de l'univers (OASU), Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), and Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Brightness, 010308 nuclear & particles physics, [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], galaxies: active, [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Flux, Astronomy and Astrophysics, Astrophysics, radiation mechanisms: non-thermal, gamma rays: theory, 01 natural sciences, law.invention, Telescope, Space and Planetary Science, law, 0103 physical sciences, Blazar, BL Lacertae objects: individual: 3C 66A, 010303 astronomy & astrophysics, BL Lac object
Abstract: International audience; Prompted by a high optical state in 2007 September, the Whole Earth Blazar Telescope consortium organized an intensive optical, near-IR (JHK) and radio observing campaign on the intermediate BL Lac object 3C 66A throughout the fall and winter of 2007-2008. In this paper, we present data from 28 observatories in 12 countries, covering the observing season from late 2007 July through 2008 February. The source remained in a high optical state throughout the observing period and exhibited several bright flares on timescales of ~10 days. This included an exceptional outburst around 2007 September 15-20, reaching a peak brightness at R~ 13.4. Our campaign revealed microvariability with flux changes up to |dR/dt|~ 0.02 mag hr–1. Our observations do not reveal evidence for systematic spectral variability in the overall high state covered by our campaign, in agreement with previous results. In particular, we do not find evidence for spectral hysteresis in 3C 66A for which hints were found in an earlier campaign in a somewhat lower flux state. We also did not find any evidence for spectral lags in the discrete correlation functions between different optical bands. We infer a value of the magnetic field in the emission region of B~ 19 e 2/7 B τ–6/7 h D 13/7 1 G, where eB is the magnetic field equipartition fraction, τ h is the shortest observed variability timescale in units of hours, and D 1 is the Doppler factor in units of 10. From the lack of systematic spectral variability, we can derive an upper limit on the Doppler factor, D
Published: 2009
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47. WEBT multiwavelength monitoring and XMM-Newton observations of BL Lacertae in 2007-2008

Author: RAITERI, Claudia Maria, VILLATA, Massimo, CAPETTI, Alessandro, Aller, M.F., Bach, U., Calcidese, P., Gurwell, M.A., Larionov, V.M., Ohlert, J., Nilsson, K., Strigachev, A., Agudo, I., Aller, H.D., Bachev, R., Benítez, E., Berdyugin, A., Böttcher, M., BUEMI, CARLA SIMONA, Buttiglione, S., Carosati, D., Charlot, P., Chen, W.P., Dultzin, D., Forné, E., Fuhrmann, L., Gómez, J.L., Gupta, A.C., Heidt, J., Hiriart, D., Hsiao, W.-S., Jelínek, M., Jorstad, S.G., Kimeridze, G.N., Konstantinova, T.S., Kopatskaya, E.N., Kostov, A., Kurtanidze, O.M., Lähteenmäki, A., LANTERI, Luciano, Larionova, L.V., LETO, PAOLO, Latev, G., Le Campion, J.-F., Lee, C.-U., Ligustri, R., Lindfors, E., Marscher, A.P., Mihov, B., Nikolashvili, M.G., Nikolov, Y., Ovcharov, E., Principe, D., Pursimo, T., Ragozzine, B., Robb, R.M., Ros, J.A., Sadun, A.C., Sagar, R., Semkov, E., Sigua, L.A., SMART, Richard Laurence, Sorcia, M., Takalo, L.O., Tornikoski, M., TRIGILIO, CORRADO, Uckert, K., UMANA, Grazia Maria Gloria, Valcheva, A., and Volvach, A.
Abstract: In 2007-2008 we carried out a new multiwavelength campaign of the Whole Earth Blazar Telescope (WEBT) on BL Lacertae, involving three pointings by the XMM-Newton satellite, to study its emission properties. The source was monitored in the optical-to-radio bands by 37 telescopes. The brightness level was relatively low. Some episodes of very fast variability were detected in the optical bands. The X-ray spectra are well fitted by a power law with photon index of about 2 and photoelectric absorption exceeding the Galactic value. However, when taking into account the presence of a molecular cloud on the line of sight, the data are best fitted by a double power law, implying a concave X-ray spectrum. The spectral energy distributions (SEDs) built with simultaneous radio-to-X-ray data at the epochs of the XMM-Newton observations suggest that the peak of the synchrotron emission lies in the near-IR band, and show a prominent UV excess, besides a slight soft-X-ray excess. A comparison with the SEDs corresponding to previous observations with X-ray satellites shows that the X-ray spectrum is extremely variable. We ascribe the UV excess to thermal emission from the accretion disc, and the other broad-band spectral features to the presence of two synchrotron components, with their related SSC emission. We fit the thermal emission with a black body law and the non-thermal components by means of a helical jet model. The fit indicates a disc temperature greater than 20000 K and a luminosity greater than 6 x 10^44 erg/s.
Published: 2009

48. The GASP-WEBT monitoring of 3C 454.3 during the 2008 optical-to-radio and γ-ray outburst

Author: Villata, M, Raiteri, C. M., Gurwell, M. A., Larionov, V. M., Kurtanidze, O. M., Aller, M. F., Lähteenmäki, A, Chen, W. P., Nilsson, K, Agudo, I, Aller, H. D., Arkharov, A. A., Bach, U, Bachev, R, Beltrame, P, Benítez, E, Buemi, C. S., Böttcher, M, Calcidese, P, Capezzali, D, Carosati, D, DA RIO, D, DI PAOLA, A, Dolci, M, Dultzin, D, Forné, E, Gómez, J. L., HAGEN THORN, V. A., Halkola, A, Heidt, J, Hiriart, D, Hovatta, T, Hsiao, H. Y., Jorstad, S. G., Kimeridze, G. N., Konstantinova, T. S., Kopatskaya, E. N., Koptelova, E, Leto, P, Ligustri, R, Lindfors, E, Lopez, J. M., Marscher, A. P., Mommert, M, Mujica, R, Nikolashvili, M. G., Palma, N, Pasanen, M, ROCA SOGORB, M, Ros, J. A., Roustazadeh, P, Sadun, A. C., Saino, J, Sigua, L. A., Sorcia, M, Takalo, L. O., Tornikoski, M, Trigilio, Corrado, Turchetti, R, and Umana, G.
Published: 2009

49. A new activity phase of the blazar 3C 454.3. Multifrequency observations by the WEBT and XMM-Newton in 2007-2008

Author: Raiteri, C. M., Villata, M, Larionov, V. M., Gurwell, M. A., Chen, W. P., Kurtanidze, O. M., Aller, M. F., Böttcher, M, Calcidese, P, Hroch, F, Lähteenmäki, A, Lee, C. U., Nilsson, K, Ohlert, J, Papadakis, I. E., Agudo, I, Aller, H. D., Angelakis, E, Arkharov, A. A., Bach, U, Bachev, R, Berdyugin, A, Buemi, C. S., Carosati, D, Charlot, P, Chatzopoulos, E, Forné, E, Frasca, A, Fuhrmann, L, Gómez, J. L., Gupta, A. C., HAGEN THORN, V. A., Hsiao, W. S., Jordan, B, Jorstad, S. G., Konstantinova, T. S., Kopatskaya, E. N., Krichbaum, T. P., Lanteri, L, Larionova, L. V., Latev, G, LE CAMPION, J. F., Leto, P, Lin, H. C., Marchili, N, Marilli, E, Marscher, A. P., Mcbreen, B, Mihov, B, Nesci, R, Nicastro, F, Nikolashvili, M. G., Novak, R, Ovcharov, E, Pian, E, Principe, D, Pursimo, T, Ragozzine, B, Ros, J. A., Sadun, A. C., Sagar, R, Semkov, E, Smart, R. L., Smith, N, Strigachev, A, Takalo, L. O., Tavani, M, Tornikoski, M, Trigilio, Corrado, Uckert, K, Umana, G, Valcheva, A, Vercellone, S, Volvach, A, Wiesemeyer, H., INAF - Osservatorio Astrofisico di Torino (OATo), Istituto Nazionale di Astrofisica (INAF), Shanghai Institute of Ceramics, Chinese Academy of Science (CAS), Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire aquitain des sciences de l'univers (OASU), Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), and Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Photon, [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], FOS: Physical sciences, Flux, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Radiation, 01 natural sciences, Spectral line, law.invention, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], law, 0103 physical sciences, galaxies: quasars: individual: 3C 454.3, Emission spectrum, Blazar, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, 010308 nuclear & particles physics, Astrophysics (astro-ph), Astronomy and Astrophysics, galaxies: jets, Light curve, Synchrotron, galaxies: quasars: general, 13. Climate action, Space and Planetary Science
Abstract: We present and analyse the WEBT multifrequency observations of 3C 454.3 in the 2007-2008 observing season, including XMM-Newton observations and near-IR spectroscopic monitoring, and compare the recent emission behaviour with the past one. In the optical band we observed a multi-peak outburst in July-August 2007, and other faster events in November 2007 - February 2008. During these outburst phases, several episodes of intranight variability were detected. A mm outburst was observed starting from mid 2007, whose rising phase was contemporaneous to the optical brightening. A slower flux increase also affected the higher radio frequencies, the flux enhancement disappearing below 8 GHz. The analysis of the optical-radio correlation and time delays, as well as the behaviour of the mm light curve, confirm our previous predictions, suggesting that changes in the jet orientation likely occurred in the last few years. The historical multiwavelength behaviour indicates that a significant variation in the viewing angle may have happened around year 2000. Colour analysis reveals a complex spectral behaviour, which is due to the interplay of different emission components. All the near-IR spectra show a prominent Halpha emission line, whose flux appears nearly constant. The analysis of the XMM-Newton data indicates a correlation between the UV excess and the soft-X-ray excess, which may represent the head and the tail of the big blue bump, respectively. The X-ray flux correlates with the optical flux, suggesting that in the inverse-Compton process either the seed photons are synchrotron photons at IR-optical frequencies or the relativistic electrons are those that produce the optical synchrotron emission. The X-ray radiation would thus be produced in the jet region from where the IR-optical emission comes., Comment: 10 pages, 12 figures (7 included in the text, 5 in GIF format), accepted for publication in A&A
Published: 2008
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50. A PAthway Towards the Characterization of Habitable Earths (APACHE)

Author: SOZZETTI, Alessandro, LATTANZI, Mario Gilberto, GAI, Mario, LIGORI, Sebastiano, Smart, Richard, Desidera, S., Gratton, R., Jones, H.R.A., Pinfield, D., Calcidese, P., Bernagozzi, A., and Damasso, M.
Published: 2008

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