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1. Multiple myeloma: response to treatment and survival of patients according to the interim analysis of the Russian observational, retrospective-prospective, multicenter cohort study (MULTISPECT)

Author

Vadim V. Ptushkin, Michail A. Kunst, Tatiana A. Mitina, Tatiana S. Konstantinova, Natalia N. Rachkova, Tatiana V. Shelekhova, Ilya V. Elykomov, Galina B. Kuchma, Kiriena O. Farizova, Olga Yu. Vinogradova, Eugene A. Nikitin, and Evgeny D. Pashanov

Subjects
multiple myeloma overall survival, progression-free survival, autologous hematopoietic stem cell transplantation, allogeneic hematopoietic stem cell transplantation, complete remission, partial remission, stabilization or progression, Medicine
Abstract

Aim. The primary objective of the interim analysis of the MULTISPECT study was to evaluate the short-term efficacy of the treatment and long-term outcomes in cohorts of primary and pretreated patients with multiple myeloma (MM) receiving treatment in actual clinical practice in various regions of the Russian Federation. Secondary objectives were a description of the main characteristics of patients; analysis of the most commonly used therapy regimens of the 1st and later lines and the sequence of their changes; evaluation of the response to therapy. Additional objectives included evaluation of the effect of the new COVID-19 coronavirus infection on the course of MM in patients. Materials and methods. The study is an observational retrospective-prospective multicenter cohort study. For its implementation, a structured database of patients with MM was used, provided by hematologists of the centers affiliated for the study. Results. The study included 1,294 patients (cohort 1 806, cohort 2 488). In both cohorts, patients aged 6069 years were in the majority. 3 lines of therapy (L1, L2, L3) were used for cohort 1; in cohort 2, the 4th line of therapy was also used in 2 patients. The therapy regimens were analyzed for 290 (22.41%) of all patients in the study. Responses to therapy were analyzed for 214 patients of cohort 1 and 109 patients of cohort 2. Autologous and allogeneic hematopoietic stem cell transplantations were carried out for a limited proportion of patients in both cohorts. At the end of the study and upon presentation of its results, the status of patients was the following: 96% of patients in cohort 1 and 89% in cohort 2 were alive. The therapy regimens in both cohorts were characterized by variability. The most commonly used regimens in each of the lines of therapy have been identified. The most used therapy regimen in patients with MM of both cohorts was the VCD-regime. Rd-regime in cohort 1 and RD-regime in cohort 2 were the second most frequent used regimens. In patients of both cohorts, the therapy regimens including Bortezomib were most often used. Conclusion. The variety of therapy regimens used to treat MM in actual clinical practice may be due to the factors of availability of new medicines and updated recommendations for the treatment of the disease. Further, in the context of this study, a more detailed analysis of the efficacy of certain therapy regimens in the 1st and later lines on progression free survival and overall survival of MM patients should be carried out.

Published
2022
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2. The efficacy and safety of eculizumab biosimilar in patients with paroxysmal nocturnal hemoglobinuria. Results of a phase III randomized open-label comparative clinical trial

Author

Aleksandr D. Kulagin, Bulat A. Bakirov, Igor L. Davydkin, Ilya V. Elykomov, Tatiana S. Konstantinova, Aleksandr V. Korobkin, Marina V. Kosinova, Vadim I. Mazurov, Natalia V. Minaeva, Andrei V. Proidakov, Vadim V. Ptushkin, Yuri V. Shatokhin, Yulia N. Lin'kova, Arina V. Zinkina-Orikhan, and Maria A. Morozova

Subjects
eculizumab, biosimilar, complement system, paroxysmal nocturnal hemoglobinuria, hemolysis, Medicine
Abstract

Aim. To establish the equivalent efficacy and comparable safety profile of biosimilar Acveris and referent eculizumab product Soliris used for the treatment of paroxysmal nocturnal hemoglobinuria (PNH). Materials and methods. Were included in the phase III multicenter 28 PNH patients, open-label clinical trial. Participants were randomized (1:1) into 2 treatment groups: investigational product (Acveris, n=14) and referent product (Soliris, n=14). Patients received eculizumab as the intravenous infusion 600 mg once a week during the first 4 weeks, 900 mg at week 5 and then 900 mg every 14 days (2 days) up to week 27 of the study. The efficacy, pharmacokinetics, pharmacodynamics, safety and immunogenicity of the compared products were analyzed after the end of 27 weeks of the study. The primary efficacy endpoint was the area under the curve LDH concentrationtime (AUCLDH) throughout the study period weeks 527. Results. The difference between the mean AUCLDH values between the Acveris and Soliris groups was 5380.0 [-38 773.87; 49 533.87] U/ldays. The 95% CI limits for the difference in mean AUCLDH values between the groups fit the preset 95% CI [-146 500.9146 500.9] U/ldays and establish the equivalent efficacy of the biosimilar and referent product according to the primary efficacy endpoint. The safety profile of both Acveris and Soliris was expected and comparable according to the proportion of patients with adverse events. The formation of binding antibodies to eculizumab was not detected in both the groups. Conclusion. The study established the equivalent efficacy of biosimilar product Acveris and referent eculizumab product with the evidence of effective suppression of intravascular hemolysis in PNH patients along with a comparable favorable safety profile.

Published
2021
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3. Lisaftoclax (APG-2575) Safety and Activity As Monotherapy or Combined with Acalabrutinib or Rituximab in Patients (pts) with Treatment-Naïve, Relapsed or Refractory Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma (R/R CLL/SLL): Initial Data from a Phase 2 Global Study

Author

Matthew S. Davids, Asher Chanan-Khan, Boyd Mudenda, Larysa Nogaieva, Iryna Kriachok, Hanna Usenko, Vladimir Ivanov, Olena Kyselova, Tetiana Perekhrestenko, Ivan Muzhychuk, Alexander Myasnikov, Zvenyslava Maslyak, Andrew Proidakov, Olga Uspenskaya, Elena Borisenkova, Paula Marlton, Tanya Siddiqi, Allison Winter, Tamila Lysa, Bulat Bakirov, Lei Fu, Zi Chen, Min Yu, Mingyu Li, Laura Glass, Mohammad Ahmad, Olena Karpenko, Iurii Osipov, Asit De, Ben Paudyal, Hengbang Wang, Robert Winkler, Nashat Gabrail, Vinod Ganju, Tatiana S. Konstantinova, Olga S. Samoylova, Dajun Yang, and Yifan Zhai

Subjects
Immunology, Cell Biology, Hematology, Biochemistry
Published
2022

4. The connection between the parsec-scale radio jet and γ-ray flares in the blazar 1156+295

Author

Emilia Järvelä, Vladimir A. Hagen-Thorn, Merja Tornikoski, Nicholas R. MacDonald, Elena G. Larionova, Esko Valtaoja, Dmitry A. Blinov, N. V. Efimova, Ivan S. Troitsky, Mark Gurwell, Alan P. Marscher, N. Lavonen, E. N. Kopatskaya, Iván Agudo, José L. Gómez, L. V. Larionova, Brian W. Taylor, Elizaveta Rastorgueva-Foi, Kaj Wiik, Margo F. Aller, Ian M. McHardy, Tatiana S. Konstantinova, Sol N. Molina, V. Ramakrishnan, Joni Tammi, D. A. Morozova, Carolina Casadio, Anne Lähteenmäki, Manasvita Joshi, E. Nieppola, Svetlana G. Jorstad, Valeri M. Larionov, Jonathan León-Tavares, Anne Lähteenmäki Group, Department of Radio Science and Engineering, Aalto-yliopisto, and Aalto University

Subjects
gamma-rays: galaxies, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, education, ta221, galaxies: active, jets [galaxies], ta1171, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Radio spectrum, quasars: individual: 1156+295, Astrophysical jet, 0103 physical sciences, ta216, Blazar, 010303 astronomy & astrophysics, Very Long Baseline Array, radio continuum: galaxies, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Jet (fluid), ta115, Superluminal motion, ta213, ta114, 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysics, galaxies: jets, Light curve, galaxies [radio continuum], galaxies [gamma-rays], Space and Planetary Science, active [galaxies], individual: 1156+295 [quasars], Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The blazar 1156+295 was active at gamma-ray energies, exhibiting three prominent flares during the year 2010. Here, we present results using the combination of broadband (X-ray through mm single dish) monitoring data and radio band imaging data at 43 GHz on the connection of gamma-ray events to the ejections of superluminal components and other changes in the jet of 1156+295. The kinematics of the jet over the interval 2007.0-2012.5 using 43 GHz Very Long Baseline Array observations, reveal the presence of four moving and one stationary component in the inner region of the blazar jet. The propagation of the third and fourth components in the jet corresponds closely in time to the active phase of the source in gamma rays. We briefly discuss the implications of the structural changes in the jet for the mechanism of gamma-ray production during bright flares. To localise the gamma-ray emission site in the blazar, we performed the correlation analysis between the 43 GHz radio core and the gamma-ray light curve. The time lag obtained from the correlation constrains the gamma-ray emitting region in the parsec-scale jet., Comment: 11 pages, 7 figures and 3 tables. Accepted for publication in MNRAS. Online-only Table 1 is available as ancillary file with this submission

Published
2014

5. Correlation Analysis of Delays between Variations of Gamma-Ray and Optical Light Curves of Blazars

Author

L. V. Larionova, Arkady A. Arkharov, Michael P. Malmrose, Dmitry A. Blinov, Brian Taylor, Tatiana S. Konstantinova, Vladimir A. Hagen-Thorn, Svetlana G. Jorstad, Alan P. Marscher, Valeri M. Larionov, E. N. Kopatskaya, Elena G. Larionova, Carolina Casadio, Karen E. Williamson, Manasvita Joshi, Ian M. McHardy, José L. Gómez, Sol N. Molina, I. S. Troitsky, Iván Agudo, and Daria A. Morozova

Subjects
Physics, galaxies:active, galaxies: jets, quasars: general, BL Lacertae objects: general, Photon, 010308 nuclear & particles physics, Gamma ray, Astronomy, Astronomy and Astrophysics, Quasar, Astrophysics, Light curve, 01 natural sciences, Correlation, Spitzer Space Telescope, 0103 physical sciences, Blazar, 010303 astronomy & astrophysics, Fermi Gamma-ray Space Telescope
Abstract

We have been performing multi-wavelength monitoring of a sample of γ -ray blazars since the launch of the Fermi Gamma-ray Space Telescope in 2008. We present γ -ray and optical light curves for several quasars and BL Lac objects from the sample to illustrate different patterns of variability. We investigate correlations between γ -ray and R-band light curves and, if these are statistically significant, determine delays between variations at the two wavebands. Such time delays can reveal the relative locations of the emitting regions in AGN jets and the origin of the high-energy photons. We present preliminary results of this analysis. Of the 29 blazars with sufficient time coverage, 17 display a significant, singular, correlated time lag when tested over the entire 7-year period. Of these sources, the six that exhibit a consistent time lag across a majority of epochs of high activity have lags of 0 ± 7 days; the 11 without consistency across epochs of high activity generally display longer mean lags, with γ -ray leading optical. Eleven sources display no significant singular correlation over either the entire 7-year period or across shorter intervals. No significant difference is apparent between the BL Lac objects and FSRQs. Even after 7 years of monitoring, our correlation analysis remains plagued with uncertainties due to insufficient data.

Published
2016
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6. Iron in spleen and liver: Some cases of normal tissues and tissues from patients with hematological malignancies

Author

Michael I. Oshtrakh, Alexander V. Vinogradov, Israel Felner, Tatiana S. Konstantinova, Vladimir A. Semionkin, and I. V. Alenkina

Subjects
Pathology, medicine.medical_specialty, Materials science, Normal tissue, Myeloid leukemia, Spleen, medicine.disease, Iron storage, medicine.anatomical_structure, Liver tissue, Iron content, medicine, Mantle cell lymphoma, Myelofibrosis
Abstract

Iron deposits in spleen and liver tissues obtained from several healthy people and patients with mantle cell lymphoma, acute myeloid leukemia and primary myelofibrosis were studied using Mossbauer spectroscopy and magnetization measurements. The results obtained demonstrated differences in the iron content in tissues as well as some variations in the ferrihydrite-like iron core structure in the iron storage proteins in these tissues. The presence of tiny amount of magnetite and paramagnetic component in spleen and liver tissue was also detected in different quantities in the studied tissues.

Published
2016

7. PROBING THE INNER JET OF THE QUASAR PKS 1510–089 WITH MULTI-WAVEBAND MONITORING DURING STRONG GAMMA-RAY ACTIVITY

Author

Talvikki Hovatta, Tatiana S. Konstantinova, Ivan Agudo, Vladimir A. Hagen-Thorn, Daria A. Melnichuk, Svetlana G. Jorstad, Evgenia N. Kopatskaya, Merja Tornikoski, Brian Taylor, Gary D. Schmidt, José L. Gómez, L. V. Larionova, Elena G. Larionova, Dmitry A. Blinov, Anne Lähteenmäki, Omar M. Kurtanidze, Maria G. Nikolashvili, Lorand A. Sigua, Francesca D. D'Arcangelo, Givi N. Kimeridze, Emily Manne-Nicholas, Mark Gurwell, Paul S. Smith, Alice Olmstead, Hugh D. Aller, Mar Roca-Sogorb, Ivan S. Troitsky, Ian M. McHardy, Valeri M. Larionov, Dipesh Bhattarai, Margo F. Aller, and Alan P. Marscher

Subjects
Physics, Jet (fluid), Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Linear polarization, Astrophysics::High Energy Astrophysical Phenomena, Compton scattering, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Quasar, Optical polarization, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, law.invention, Space and Planetary Science, law, 0103 physical sciences, 010303 astronomy & astrophysics, Very Long Baseline Array, Astrophysics - Cosmology and Nongalactic Astrophysics, Flare
Abstract

We present results from monitoring the multi-waveband flux, linear polarization, and parsec-scale structure of the quasar PKS 1510-089, concentrating on eight major gamma-ray flares that occurred during the interval 2009.0-2009.5. The gamma-ray peaks were essentially simultaneous with maxima at optical wavelengths, although the flux ratio of the two wavebands varied by an order of magnitude. The optical polarization vector rotated by 720 degrees during a 5-day period encompassing six of these flares. This culminated in a very bright, roughly 1 day, optical and gamma-ray flare as a bright knot of emission passed through the highest-intensity, stationary feature (the "core") seen in 43 GHz Very Long Baseline Array images. The knot continued to propagate down the jet at an apparent speed of 22c and emit strongly at gamma-ray energies as a months-long X-ray/radio outburst intensified. We interpret these events as the result of the knot following a spiral path through a mainly toroidal magnetic field pattern in the acceleration and collimation zone of the jet, after which it passes through a standing shock in the 43 GHz core and then continues downstream. In this picture, the rapid gamma-ray flares result from scattering of infrared seed photons from a relatively slow sheath of the jet as well as from optical synchrotron radiation in the faster spine. The 2006-2009.7 radio and X-ray flux variations are correlated at very high significance; we conclude that the X-rays are mainly from inverse Compton scattering of infrared seed photons by 20-40 MeV electrons., Comment: 10 pages of text + 5 figures, to be published in Astrophysical Journal Letters in 2010

Published
2010

8. Polarization of radiation from Supernova 2005cs and possible physical mechanisms of its generation

Author

Valeri M. Larionov, E. N. Kopatskaya, Tatiana S. Konstantinova, and Yu. N. Gnedin

Subjects
Physics, Brightness, Linear polarization, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Polarimetry, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Polarization (waves), Position angle, law.invention, Telescope, Supernova, Space and Planetary Science, Observatory, law, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

We present R-band polarimetry and photometry for Supernova 2005cs. The polarimetric observations were performed with the AZT-8 telescope at the Crimean Astrophysical Observatory (Ukraine) using the ST-7 photometer-polarimeter of the Sobolev Astronomical Institute. A record (for supernovae) linear polarization, p = 8%, was detected; the position angle underwent a jump by ≲90° during the evolution of the supernova brightness. Possible generation mechanisms of the polarized radiation at the photospheric stage of evolution of the supernova are briefly analyzed.

Published
2007

9. The outburst of the Blazar S4 0954+658 in 2011 March–April

Author

Elena G. Larionova, S. G. Jorstad, V. A. Hagen-Thorn, Merja Tornikoski, A. E. Volvach, L. N. Volvach, E. I. Hagen-Thorn, Ivan S. Troitsky, L. V. Larionova, Manasvita Joshi, D. Blinov, I. Agudo, J. L. Gomez, Carolina Casadio, Anne Lähteenmäki, Sol N. Molina, Tatiana S. Konstantinova, E. N. Kopatskaya, D. A. Morozova, N. V. Efimova, Valeri M. Larionov, Joni Tammi, I. M. McHardy, E. Rastorgueva-Foi, Alan P. Marscher, Anne Lähteenmäki Group, Department of Radio Science and Engineering, Aalto-yliopisto, and Aalto University

Subjects
Physics, Brightness, polarization, Superluminal motion, education, jets [galaxies], Astronomy and Astrophysics, Optical polarization, Astrophysics, Position angle, Space and Planetary Science, active [galaxies], individual: S4 0954+658 [BL Lacertae objects], Blazar, Ejecta, Very Long Baseline Array, Fermi Gamma-ray Space Telescope
Abstract

We present the results of optical (R band) photometric and polarimetric monitoring and Very Long Baseline Array (VLBA) imaging of the blazar S4 0954+658, along with Fermi and gamma;-ray data during a multi-waveband outburst in 2011 March-April. After a faint state with a brightness level R ~17.6 mag registered in the first half of January 2011, the optical brightness of the source started to rise and reached ~14.8 mag during the middle of March, showing flare-like behavior. The most spectacular case of intranight variability was observed during the night of 2011 March 9, when the blazar brightened by ~0.7 mag within ~7 hours. During the rise of the flux the position angle of optical polarization rotated smoothly over more than 300$\deg$. At the same time, within 1$\sigma$ uncertainty a new superluminal knot appeared with an apparent speed of 19.0$\pm$0.3 c. We have very strong evidence for association of this knot with the multi-waveband outburst in 2011 March-April. We also analyze the multi-frequency behavior of S4 0954+658 during a number of minor outbursts from August 2008 to April 2012. We find some evidence of connections between at least two more superluminal ejecta and near-simultaneous optical flares.

Published
2014

10. Comprehensive Monitoring of Gamma-ray Bright Blazars. I. Statistical Study of Optical, X-ray, and Gamma-ray Spectral Slopes

Author

José L. Gómez, Karen E. Williamson, Manasvita Joshi, Daria A. Morozova, Vladimir A. Hagen-Thorn, Dmitry A. Blinov, Brian Taylor, Ivan Agudo, Sol N. Molina, Svetlana G. Jorstad, Carolina Casadio, Tatiana S. Konstantinova, Elena G. Larionova, Gary D. Schmidt, Alan P. Marscher, L. V. Larionova, Evgenia N. Kopatskaya, Arkady A. Arkharov, Ivan S. Troitsky, Michael P. Malmrose, Paul S. Smith, Valeri M. Larionov, Ian M. McHardy, and N. V. Efimova

Subjects
Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Swift Gamma-Ray Burst Mission, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Quasar, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Light curve, 01 natural sciences, Astrophysics - Astrophysics of Galaxies, Galaxy, Spectral line, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Blazar, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Fermi Gamma-ray Space Telescope
Abstract

We present $\gamma$-ray, X-ray, ultraviolet, optical, and near-infrared light curves of 33 $\gamma$-ray bright blazars over four years that we have been monitoring since 2008 August with multiple optical, ground-based telescopes and the Swift satellite, and augmented by data from the Fermi Gamma-ray Space Telescope and other publicly available data from Swift. The sample consists of 21 flat-spectrum radio quasars (FSRQs) and 12 BL Lac objects (BL Lacs). We identify quiescent and active states of the sources based on their $\gamma$-ray behavior. We derive $\gamma$-ray, X-ray, and optical spectral indices, $\alpha_\gamma$, $\alpha_X$, and $\alpha_o$, respectively ($F_\nu\propto\nu^\alpha$), and construct spectral energy distributions (SEDs) during quiescent and active states. We analyze the relationships between different spectral indices, blazar classes, and activity states. We find (i) significantly steeper $\gamma$-ray spectra of FSRQs than for BL Lacs during quiescent states, but a flattening of the spectra for FSRQs during active states while the BL Lacs show no significant change; (ii) a small difference of $\alpha_X$ within each class between states, with BL Lac X-ray spectra significantly steeper than in FSRQs; (iii) a highly peaked distribution of X-ray spectral slopes of FSRQs at $\sim-$0.60, but a very broad distribution of $\alpha_X$ of BL Lacs during active states; (iv) flattening of the optical spectra of FSRQs during quiescent states, but no statistically significant change of $\alpha_o$ of BL Lacs between states; and (v) a positive correlation between optical and $\gamma$-ray spectral slopes of BL Lacs, with similar values of the slopes. We discuss the findings with respect to the relative prominence of different components of high-energy and optical emission as the flux state changes., Comment: 40 pages, 28 figures, 10 Tables. Additional figures at http://www.bu.edu/blazars/VLBAproject.html. Accepted by ApJ

Published
2014

11. The awakening of BL Lacertae: observations by Fermi, Swift, and the GASP-WEBT

Author

V. T. Doroshenko, A. Berdyugin, M. I. Carnerero, Filippo D'Ammando, Stoyanka Peneva, Evgeni Semkov, D. O. Mirzaqulov, D. Carosati, A. C. Sadun, Elina Lindfors, M. J. Arévalo, J. Phipps, Dmitry A. Blinov, Rumen Bachev, Evgeni Ovcharov, S. G. Sergeev, Givi N. Kimeridze, K. A. Stoyanov, Svetlana G. Jorstad, Valeri M. Larionov, Neelam Panwar, Y. Metodieva, Y. Jadhav, R. Ligustri, Meenakshi Kohli, V. Kadenius, Alan P. Marscher, Antoniya Valcheva, N. Smith, I. M. McHardy, Sh. A. Ehgamberdiev, Sunay Ibryamov, Elena G. Larionova, Paul S. Smith, A. Sillanpää, R. Reinthal, C. M. Raiteri, A. Strigachev, Tatiana S. Konstantinova, Iván Agudo, M. G. Nikolashvili, V. Bozhilov, N. G. Pulatova, S. V. Nazarov, Carolina Casadio, Helmut Wiesemeyer, David Hiriart, G. A. Borman, Ivan S. Troitsky, R. D. Schwartz, Ekaterina Koptelova, Markus Böttcher, M. Villata, Kari Nilsson, E. N. Kopatskaya, Wen Ping Chen, B. McBreen, J. A. Ros, L. V. Larionova, Lorand A. Sigua, J. A. Acosta-Pulido, Ann E. Wehrle, Mark Gurwell, S. A. Klimanov, Manasvita Joshi, M. Pasanen, Erika Benítez, D. N. Okhmat, L. O. Takalo, N. V. Efimova, Brian W. Taylor, Omar M. Kurtanidze, Clemens Thum, Sol N. Molina, D. A. Morozova, Pedro A. Gonzalez-Morales, Yu. S. Efimov, José L. Gómez, Raiteri CM, Villata M, DAmmando F, Larionov VM, Gurwell MA, Mirzaqulov DO, Smith PS, Acosta-Pulido JA, Agudo I, Arevalo MJ, Bachev R, Benitez E, Berdyugin A, Blinov DA, Borman GA, Bottcher M, Bozhilov V, Carnerero MI, Carosati D, Casadio C, Chen WP, Doroshenko VT, Efimova YS, Efimova NV, Ehgamberdiev SA, Gomez JL, Gonzalez-Morales PA, Hiriart D, Ibryamov S, Jadhav Y, Jorstad SG, Joshi M, Kadenius V, Klimanov SA, Kohli M, Konstantinova TS, Kopatskaya EN, Koptelova E, Kimeridze G, Kurtanidze OM, Larionova EG, Larionova LV, Ligustri R, Lindfors E, Marscher AP, McBreen B, McHardy IM, Metodieva Y, Molina SN, Morozova DA, Nazarov SV, Nikolashvili MG, Nilsson K, Okhmat DN, Ovcharov E, Panwar N, Pasanen M, Peneva S, Phipps J, Pulatova NG, Reinthal R, Ros JA, Sadun AC, Schwartz RD, Semkov E, Sergeev SG, Sigua LA, Sillanpaa A, Smith N, Stoyanov K, Strigachev A, Takalo LO, Taylor B, Thum C, Troitsky IS, Valcheva A, Wehrle AE, and Wiesemeyer H

Subjects
Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Cosmology and Nongalactic Astrophysics (astro-ph.CO), ta115, Astrophysics::High Energy Astrophysical Phenomena, Astronomy, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Polarization (waves), law.invention, Telescope, Wavelength, Space and Planetary Science, Observatory, law, Degree of polarization, galaxies: active, BL Lacertae objects: general, BL Lacertae objects: individual: BL Lacertae, galaxies: jets, Blazar, Astrophysics - High Energy Astrophysical Phenomena, BL Lac object, Fermi Gamma-ray Space Telescope, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Since the launch of the Fermi satellite, BL Lacertae has been moderately active at gamma-rays and optical frequencies until May 2011, when the source started a series of strong flares. The exceptional optical sampling achieved by the GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT) in collaboration with the Steward Observatory allows us to perform a detailed comparison with the daily gamma-ray observations by Fermi. Discrete correlation analysis between the optical and gamma-ray emission reveals correlation with a time lag of 0 +- 1 d, which suggests cospatiality of the corresponding jet emitting regions. A better definition of the time lag is hindered by the daily gaps in the sampling of the extremely fast flux variations. In general, optical flares present more structure and develop on longer time scales than corresponding gamma-ray flares. Observations at X-rays and at millimetre wavelengths reveal a common trend, which suggests that the region producing the mm and X-ray radiation is located downstream from the optical and gamma-ray-emitting zone in the jet. The mean optical degree of polarisation slightly decreases over the considered period and in general it is higher when the flux is lower. The optical electric vector polarisation angle (EVPA) shows a preferred orientation of about 15 deg, nearly aligned with the radio core EVPA and mean jet direction. Oscillations around it increase during the 2011-2012 outburst. We investigate the effects of a geometrical interpretation of the long-term flux variability on the polarisation. A helical magnetic field model predicts an evolution of the mean polarisation that is in reasonable agreement with the observations. These can be fully explained by introducing slight variations in the compression factor in a transverse shock waves model., 17 pages, 17 figures, 1 table, accepted for publication in MNRAS

Published
2013

12. The Outburst of the Blazar S5 0716+71 in 2011 October: Shock in a Helical Jet

Author

Dmitry A. Blinov, Alan P. Marscher, Tatiana S. Konstantinova, Valeri M. Larionov, Daria A. Morozova, E. N. Kopatskaya, Vladimir A. Hagen-Thorn, L. V. Larionova, Elena G. Larionova, Svetlana G. Jorstad, and Ivan S. Troitsky

Subjects
Shock wave, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Superluminal motion, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Linear polarization, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Quasar, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Space and Planetary Science, Blazar, Astrophysics - High Energy Astrophysical Phenomena, Very Long Baseline Array, Fermi Gamma-ray Space Telescope, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present the results of optical (R band) photometric and polarimetric monitoring and Very Long Baseline Array (VLBA) imaging of the blazar S5 0716+714 along with Fermi gamma-ray data during a multi-waveband outburst in 2011 October. We analyze total and polarized intensity images of the blazar obtained with the VLBA at 43 GHz during and after the outburst. Monotonic rotation of the linear polarization vector at a rate of >50 degrees per night coincided with a sharp maximum in gamma-ray and optical flux. At the same time, within the uncertainties, a new superluminal knot appeared, with an apparent speed of ~21c. The general multi-frequency behavior of the outburst can be explained within the framework of a shock wave propagating along a helical path in the blazar's jet., 7 pages, 9 figures, accepted for publication in The Astrophysical Journal; minor corrections in the Acknowledgments

Published
2013

13. Analyzing polarization swings in 3C 279

Author

Valeri M. Larionov, Kari Nilsson, A. N. Burenkov, V. E. Zhdanova, L. V. Larionova, I. Korobtsev, I. M. McHardy, Alan P. Marscher, Elena G. Larionova, T. Krajci, M. G. Nikolashvili, N. G. Bochkarev, Iván Agudo, Frank K. Schinzel, Elina Lindfors, Sol N. Molina, S. G. Jorstad, J. A. Zensus, L. O. Takalo, Brian W. Taylor, Jochen Heidt, E. N. Kopatskaya, Sebastian Kiehlmann, S. V. Nazarov, D. A. Morozova, R. Reinthal, G. A. Borman, A. C. Sadun, N. G. Pulatova, E. López, O. I. Spiridonova, Omar M. Kurtanidze, Kirill Sokolovsky, Dmitry A. Blinov, Vladimir A. Hagen-Thorn, Givi N. Kimeridze, David Hiriart, Lorand A. Sigua, Manasvita Joshi, Erika Benítez, José L. Gómez, S. G. Sergeev, A. A. Arkharov, Yuri Y. Kovalev, Carolina Casadio, N. V. Efimova, Yasushi Fukazawa, A. Berdyugin, Tuomas Savolainen, Tatiana S. Konstantinova, V. T. Doroshenko, Sofia O. Kurtanidze, M. Sorcia, Ivan S. Troitsky, L. S. Ugolkova, and Ryosuke Itoh

Subjects
Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Brightness, ta115, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Stochastic process, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Optical polarization, Quasar, Polarization (waves), Position angle, Computational physics, Amplitude, Astrophysics - High Energy Astrophysical Phenomena, Electric vector, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Quasar 3C 279 is known to exhibit episodes of optical polarization angle rotation. We present new, well-sampled optical polarization data for 3C 279 and introduce a method to distinguish between random and deterministic electric vector position angle (EVPA) variations. We observe EVPA rotations in both directions with different amplitudes and find that the EVPA variation shows characteristics of both random and deterministic cases. Our analysis indicates that the EVPA variation is likely dominated by a random process in the low brightness state of the jet and by a deterministic process in the flaring state., Comment: 6 pages, 2 figures, 4 tables, proceeding to appear on EPJ Web of Conferences "The Innermost Regions of Relativistic Jets and their Magnetic Fields (Granada, Spain,10-14 June 2013)"

Published
2013
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14. The Structure and Emission Model of the Relativistic Jet in the Quasar 3C 279 Inferred from Radio to High-energy gamma-Ray Observations in 2008-2010

Author

Mauro Dolci, Koji S. Kawabata, Werner Collmar, M. Hayashida, R. Buehler, S. Ciprini, Krzysztof Nalewajko, Svetlana G. Jorstad, Paolo Leto, E. Lindfors, E. Forné, Yasushi Fukazawa, Walter Max-Moerbeck, Patrick Ogle, Jean-Pierre Macquart, B. Jordan, Alan P. Marscher, N. Gehrels, Merja Tornikoski, Mahito Sasada, R. Itoh, Elena G. Larionova, M. F. Aller, A. A. Arkharov, David Hiriart, Carla Buemi, N. V. Efimova, Yasunobu Uchiyama, G. M. Madejski, Tatiana S. Konstantinova, Mark Gurwell, J. L. Richards, S. N. Molina, Makoto Uemura, Joni Tammi, G. Tosti, Ann E. Wehrle, Susumu Sato, A. Lamerato, E. Cavazzuti, Manasvita Joshi, James Chiang, K. Blumenthal, D. Carosati, Roger Blandford, Hugh D. Aller, T. Sakamoto, Erika Benítez, Dmitry A. Blinov, Douglas C.-J. Bock, A. C. S. Readhead, E. N. Kopatskaya, Givi N. Kimeridze, A. Sillanpää, S. Larsson, Omar M. Kurtanidze, Anne Lähteenmäki, Andrea Rossi, Wen Ping Chen, Ekaterina Koptelova, Valeri M. Larionov, José L. Gómez, I. S. Troitsky, R. Reinthal, Masayuki Yamanaka, D. A. Morozova, C. M. Raiteri, M. Boettcher, K. Nilsson, Jochen Greiner, A. Di Paola, M. Kino, L. V. Larionova, Lukasz Stawarz, M. Sikora, Takaaki Tanaka, Anna Szostek, I. M. McHardy, M. Villata, M. G. Nikolashvili, T. Kruehler, Andrei Berdyugin, Uwe Bach, Corrado Trigilio, I. Agudo, A. Reimer, G. Umana, L. O. Takalo, Brian W. Taylor, Jochen Heidt, K. Sakimoto, P. Roustazadeh, and Lorand A. Sigua

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), galaxies: active, galaxies: jets, gamma rays: galaxies, quasars: individual: 3C 279, radiation mechanisms: non-thermal, X-rays: galaxies, Astrophysics::High Energy Astrophysical Phenomena, jets [galaxies], FOS: Physical sciences, Astrophysics, 01 natural sciences, Spectral line, law.invention, Spitzer Space Telescope, law, 0103 physical sciences, individual (3C 279) [quasars], 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, Gamma ray, Astronomy and Astrophysics, Optical polarization, Quasar, non-thermal [radiation mechanisms], Synchrotron, galaxies [X-rays], Space and Planetary Science, active [galaxies], galaxies [gamma rays], Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, Fermi Gamma-ray Space Telescope, Flare
Abstract

著者人数: 93名, Accepted: 2012-05-30, 資料番号: SA1004165000

Published
2012

15. Variability of the blazar 4C 38.41 (B3 1633+382) from GHz frequencies to GeV energies

Author

Neelam Panwar, M. J. Arévalo, Clemens Thum, Antoniya Valcheva, Mark Gurwell, Elena G. Larionova, R. D. Schwartz, S. N. Molina, Evgeni Ovcharov, M. Pasanen, J. Leon-Tavares, J. A. Ros, A. Di Paola, L. V. Larionova, Svetlana G. Jorstad, H. C. Lin, K. Blumenthal, A. Sillanpää, Tatiana S. Konstantinova, D. O. Mirzaqulov, D. A. Morozova, R. Reinthal, Jochen Heidt, Carolina Casadio, Anne Lähteenmäki, Ekaterina Koptelova, Sh. A. Ehgamberdiev, David Hiriart, Merja Tornikoski, J. A. Acosta-Pulido, D. Carosati, Mauro Dolci, G. M. Richter, Ann E. Wehrle, A. I. Gonzále, I. Agudo, T. M. Carleton, José L. Gómez, I. M. McHardy, Alan P. Marscher, I. S. Troitsky, I. Puerto-Gimenez, M. G. Nikolashvili, E. N. Kopatskaya, Paolo Leto, Corrado Trigilio, G. Umana, N. Smith, T. Sakamoto, Kari Nilsson, Omar M. Kurtanidze, Wen Ping Chen, Sofia O. Kurtanidze, Raúl Mújica, A. Bueno, Filippo D'Ammando, C. M. Raiteri, L. O. Takalo, Valeri M. Larionov, Brian W. Taylor, M. I. Carnerero, Sh. Holikov, A. A. Arkharov, N. V. Efimova, Joni Tammi, Manasvita Joshi, Paul S. Smith, M. Villata, Andrei Berdyugin, Erika Benítez, U. Bach, Dmitry A. Blinov, Hugh D. Aller, V. A. Hagen-Thorn, M. F. Aller, Elina Lindfors, Carla Buemi, Anne Lähteenmäki Group, Aalto-yliopisto, Aalto University, Raiteri CM, Villata M, Smith PS, Larionov VM, Acosta-Pulido JA, Aller MF, DAmmando F, Gurwell MA, Jorstad SG, Joshi M, Kurtanidze OM, Lahteenmaki A, Mirzaqulov DO, Agudo I, Aller HD, Arevalo MJ, Arkharov AA, Bach U, Benitez E, Berdyugin A, Blinov DA, Blumenthal K, Buemi CS, Bueno A, Carleton TM, Carnerero MI, Carosati D, Casadio C, Chen WP, Di Paola A, Dolci M, Efimova NV, Ehgamberdiev SA, Gomez JL, Gonzalez AI, Hagen-Thorn VA, Heidt J, Hiriart D, Holikov S, Konstantinova TS, Kopatskaya EN, Koptelova E, Kurtanidze SO, Larionova EG, Larionova LV, Leon-Tavares J, Leto P, Lin HC, Lindfors E, Marscher AP, McHardy IM, Molina SN, Morozova DA, Mujica R, Nikolashvili MG, Nilsson K, Ovcharov EP, Panwar N, Pasanen M, Puerto-Gimenez I, Reinthal R, Richter GM, Ros JA, Sakamoto T, Schwartz RD, Sillanpaa A, Smith N, Takalo LO, Tammi J, Taylor B, Thum C, Tornikoski M, Trigilio C, Troitsky IS, Umana G, Valcheva AT, and Wehrle AE

Subjects
Brightness, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::High Energy Astrophysical Phenomena, education, jets [galaxies], Flux, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, individual: 4C 38.41 [quasars], 0103 physical sciences, Blazar, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Jet (fluid), Line-of-sight, general [quasars], 010308 nuclear & particles physics, Astronomy and Astrophysics, Viewing angle, Light curve, galaxies: active – quasars: general – quasars: individual: 4C 38.41 – galaxies: jets, 13. Climate action, Space and Planetary Science, active [galaxies], Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, Fermi Gamma-ray Space Telescope
Abstract

The quasar-type blazar 4C 38.41 (B3 1633+382) experienced a large outburst in 2011, which was detected throughout the entire electromagnetic spectrum. We present the results of low-energy multifrequency monitoring by the GASP project of the WEBT consortium and collaborators, as well as those of spectropolarimetric/spectrophotometric monitoring at the Steward Observatory. We also analyse high-energy observations of the Swift and Fermi satellites. In the optical-UV band, several results indicate that there is a contribution from a QSO-like emission component, in addition to both variable and polarised jet emission. The unpolarised emission component is likely thermal radiation from the accretion disc that dilutes the jet polarisation. We estimate its brightness to be R(QSO) ~ 17.85 - 18 and derive the intrinsic jet polarisation degree. We find no clear correlation between the optical and radio light curves, while the correlation between the optical and \gamma-ray flux apparently fades in time, likely because of an increasing optical to \gamma-ray flux ratio. As suggested for other blazars, the long-term variability of 4C 38.41 can be interpreted in terms of an inhomogeneous bent jet, where different emitting regions can change their alignment with respect to the line of sight, leading to variations in the Doppler factor \delta. Under the hypothesis that in the period 2008-2011 all the \gamma-ray and optical variability on a one-week timescale were due to changes in \delta, this would range between ~ 7 and ~ 21. If the variability were caused by changes in the viewing angle \theta\ only, then \theta\ would go from ~ 2.6 degr to ~ 5 degr. Variations in the viewing angle would also account for the dependence of the polarisation degree on the source brightness in the framework of a shock-in-jet model., Comment: 19 pages, 23 figures, in press for Astronomy and Astrophysics

Published
2012

16. Erratum: 'multi-wavelength observations of the flaring gamma-ray blazar 3c 66a in 2008 october' (2011, apj, 726, 43)

Author

Luca Baldini, Reshmi Mukherjee, Carla Buemi, I. de la Calle Perez, A. Varlotta, Wystan Benbow, Mn Mazziotta, Jamie Holder, J. P. Norris, A. Morselli, A. D. Falcone, V. Vitale, Henric Krawczynski, T. A. Porter, Takaaki Tanaka, J. Bregeon, P. Kaaret, Stefano Ciprini, David Sanchez, A. Bouvier, Keith Bechtol, J. M. Lopez, Stephen Fegan, P. D. Smith, J. Grube, A. Cannon, R. Turchetti, Manel Errando, Sang Hun Lee, Igor V. Moskalenko, D. Dumora, J. Mehault, T. Aune, J. Lande, J. E. Ward, F. Gargano, D. Pandel, T. Glanzman, P. Calcidese, S. M. Bradbury, A. Berduygin, Marco Ajello, Jun Kataoka, Olaf Reimer, Paul J. Wang, Mauro Dolci, T. Ylinen, D. Capezzali, Vladimir A. Hagen-Thorn, Seth Digel, H. Y. Hsiao, S. Buson, H. F.W. Sadrozinski, V. Bugaev, R. Bellazzini, V. A. Acciari, S. P. Swordy, J. Saino, G. Tešić, Steven Ritz, F. Piron, D. Parent, Vladimir Vassiliev, Luca Latronico, Julie McEnery, Benoit Lott, Anne Lähteenmäki, A. S. Johnson, S. Cutini, A. Konopelko, Joachim Ripken, Ekaterina Koptelova, Brian L Winer, Martin Pohl, Kari Nilsson, G. Tosti, P. L. Nolan, N. Gehrels, Uwe Bach, Corrado Trigilio, Wen Ping Chen, J. M. Casandjian, Geza Gyuk, S. Rainò, K. Ragan, A. McCann, Roger W. Romani, P. Moriarty, Gernot Maier, Karen Byrum, A. Chekhtman, Michele Fumagalli, D. Boltuch, Talvikki Hovatta, A. N. Otte, D. J. Suson, G. H. Sembroski, A. A. Moiseev, M. Pepe, M. G. Nikolashvili, A. Sievers, Ivan Agudo, D. Carosati, Deborah Dultzin, R. Dickherber, C. M. Raiteri, S. P. Wakely, D. Riquelme, Daniel Gall, Cullen H. Blake, M. Schroedter, R. A. Ong, B. Berenji, S. McArthur, Raúl Mújica, M. Razzano, T. L. Usher, Ryosuke Itoh, M. J. Lang, C. C. Cheung, M. Sorcia, D. da Rio, David S. Davis, G.L. Godfrey, J. F. Ormes, E. Do Couto E Silva, Lars Fuhrmann, E. Cavazzuti, Mark Gurwell, G. Umana, P. Spinelli, L. O. Takalo, Francesco Longo, Mar Roca-Sogorb, Claudia Cecchi, Hugh D. Aller, Atsushi Okumura, S. Thibadeau, Richard Dubois, L. A. Sigua, Elina Lindfors, J. S. Perkins, Melissa Pesce-Rollins, Markus Böttcher, A. C. Sadun, N. Karlsson, G. H. Gillanders, S. Godambe, David Hiriart, L. Ciupik, J. H. Panetta, C. Diltz, Merja Tornikoski, Tyrel J. Johnson, Tsunefumi Mizuno, Jason X. Prochaska, R. A. Cameron, Omer Celik, C. M. Hui, F. Loparco, W. N. Johnson, Charles D. Dermer, N. Galante, Diego F. Torres, E. Forné, S. LeBohec, Lucy Fortson, C. Monte, Rumen Bachev, Matthew Wood, M. Pasanen, M. McCutcheon, E. Charles, Jochen Heidt, S. Carrigan, Amy Furniss, P. Bruel, A. Tramacere, G. Demet Senturk, F. de Palma, H. Ungerechts, Stephan Wagner, G. Finnegan, A. W. Smith, Stefan Funk, O. M. Kurtanidze, M. Ziegler, José L. Gómez, Gloria Spandre, J. G. Thayer, A. Halkola, D. Hadasch, James Chiang, A. Sander, M. F. Aller, J. E. Grove, P. Roustazadeh, D. Horan, Roger Blandford, Zhenwei Yang, P. T. Reynolds, Hideaki Katagiri, E. Roache, Carmelo Sgrò, Riccardo Rando, Gianpiero Tagliaferri, E. Hays, David Kieda, Yasushi Fukazawa, David A. Williams, Amanda Weinstein, N. Vilchez, R. Guenette, Hiromitsu Takahashi, J. H. Buckley, M. Kertzman, R. Ligustri, Markus Ackermann, E. Nuss, M. S. Shaw, David Paneque, E. Aliu, P. Fortin, H. J. Rose, T. Kamae, M. Roth, M. Kuss, Erika Benítez, Emmanouil Angelakis, Jürgen Knödlseder, A. W. Borgland, Nicola Omodei, P. Fusco, F. Krennrich, Valeri M. Larionov, P. Lubrano, M. Hayashida, A. A. Abdo, E. Orlando, N. Palma, J. Ballet, A. Cesarini, D. Starr, Tatiana S. Konstantinova, G. N. Kimeridze, M. Theiling, I. Nestoras, S. Vincent, J. Dashti, Josh Bloom, Jan Conrad, S. Germani, R. Buehler, R. E. Hughes, F. Giordano, Alan P. Marscher, J. P. Finley, John L. Quinn, Luis C. Reyes, Peter F. Michelson, Marcello Giroletti, Emanuele Bonamente, A. Reimer, A. Pichel, P. Giommi, J. A. Ros, D. Steele, M. Ozaki, T. C. Weekes, D. J. Thompson, M. Hauser, Johann Cohen-Tanugi, R. Claus, A. Sillanää, M. S. Strickman, P. Beltrame, Tomaso Belloni, G. A. Caliandro, L. Guillemot, A. A. Arkharov, M. Naumann-Godo, A. P. Waite, Jeffrey D. Scargle, Marco Frailis, K. S. Wood, V. Vasileiou, D. Gasparrini, T. Ohsugi, Paolo Leto, M. Brigida, A. Brez, A. Di Paola, V. Pelassa, Nicola Giglietto, I. A. Grenier, D. S. Hanna, S. G. Jorstad, T. C. Arlen, A. Imran, L. Costamante, M. N. Lovellette, Stephanie Wissel, P. A. Caraveo, Persis S. Drell, Gudlaugur Johannesson, M. Villata, Michael Mommert, Justin Vandenbroucke, T. Weisgarber, Guido Barbiellini, Takeshi Nakamori, Thomas Brian Humensky, E. N. Kopatskaya, Matthias Beilicke, L. Tibaldo, Wei Cui, A. Makeev, M. E. Monzani, C. Favuzzi, Jodi Christiansen, J. B. Thayer, J. A. Zensus, S. Murgia, Denis Bastieri, and Sylvain Guiriec

Subjects
Physics, Space and Planetary Science, Gamma ray, Astronomy, Astronomy and Astrophysics, Multi wavelength, Astrophysics, Blazar
Published
2011

17. Identification of gamma-ray emission from 3C345 and NRAO512

Author

M. Roca-Sogorb, Alan P. Marscher, I. S. Troitsky, Sofia O. Kurtanidze, C. M. Raiteri, O. J. A. Bravo Calle, Mark Gurwell, F. K. Schinzel, Ricard Casas, Tatiana S. Konstantinova, M. G. Nikolashvili, J. L. Gomez, V. V. Vlasyuk, Kirill Sokolovsky, M. Villata, T. H. Burnett, J. A. Zensus, H. Y. Hsiao, L. C. Reyes, S. G. Jorstad, Walter Max-Moerbeck, J. M. Casandjian, O. I. Spiridonova, E. N. Kopatskaya, D. Carosati, C. C. Cheung, Valeri M. Larionov, Omar M. Kurtanidze, I. Agudo, A. P. Lobanov, J. A. Ros, S. J. Fegan, L. V. Larionova, Lorand A. Sigua, D. A. Morozova, Elena G. Larionova, Givi N. Kimeridze, Ekaterina Koptelova, F. D'Ammando, Schinzel FK, Sokolovsky KV, DAmmando F, Burnett TH, Max-Moerbeck W, Cheung CC, Fegan SJ, Casandjian JM, Reyes LC, Villata M, Raiteri CM, Agudo I, Calle OJAB, Carosati D, Casas R, Gomez JL, Gurwell MA, Hsiao HY, Jorstad SG, Kimeridze G, Konstantinova TS, Kopatskaya EN, Koptelova E, Kurtanidze OM, Kurtanidze SO, Larionov VM, Larionova EG, Larionova LV, Marscher AP, Morozova DA, Nikolashvili MG, Roca-Sogorb M, Ros JA, Sigua LA, Spiridonova O, Troitsky IS, Vlasyuk VV, Lobanov AP, and Zensus JA

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, Astrophysics, 01 natural sciences, Radio spectrum, law.invention, Telescope, Observatory, law, 0103 physical sciences, Egret, 010306 general physics, Blazar, 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), biology, Gamma ray, Astronomy and Astrophysics, Quasar, biology.organism_classification, galaxies: active, quasars: individual: 3C 345, gamma rays: galaxies, quasars: individual: NRAO 512, quasars: individual: B3 1640+396, 13. Climate action, Space and Planetary Science, Astrophysics - High Energy Astrophysical Phenomena, Fermi Gamma-ray Space Telescope, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

For more than 15 years, since the days of the Energetic Gamma-Ray Experiment Telescope (EGRET) on board the Compton Gamma-Ray Observatory (CGRO; 1991-2000), it has remained an open question why the prominent blazar 3C 345 was not reliably detected at gamma-ray energies, 11 pages, 5 figures, 5 tables, accepted for publication in A&A

Published
2011
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18. AGILE detection of extreme \gamma-ray activity from the blazar PKS 1510-089 during March 2009. Multifrequency analysis

Author

A. Di Paola, Mark Gurwell, L. Fuhrmann, Jochen Heidt, C. Pittori, T. Froysland, G. De Paris, M. Pasanen, Elena Pian, Tatiana S. Konstantinova, A. Rubini, Sofia O. Kurtanidze, I. M. McHardy, F. Fuschino, L. Pacciani, Sandro Mereghetti, D. A. Morozova, A. A. Arkharov, Uwe Bach, Corrado Trigilio, I. Donnarumma, P. Lipari, A. Zambra, Geiland Porrovecchio, I. Agudo, M. F. Aller, M. Feroci, Merja Tornikoski, G. Piano, Y. Evangelista, Claudio Labanti, G. Umana, Filippo D'Ammando, Carla Buemi, H. A. Krimm, S. Colafrancesco, M. Fiorini, F. Perotti, Stefano Covino, Fulvio Gianotti, E. Del Monte, G. Pucella, A. Rappoldi, Andrei Berdyugin, D. Zanello, Svetlana G. Jorstad, P. Caraveo, B. McBreen, I. S. Troitsky, Paolo Leto, A. Argan, E. Forné, F. Boffelli, Talvikki Hovatta, Erika Benítez, A. Sillanpää, P. Picozza, Arnaud Ferrari, L. Salotti, V. Vittorini, Kari Nilsson, A. Morselli, E. Striani, L. A. Antonelli, Andrea Bulgarelli, Wen Ping Chen, B. Jordan, P. Santolamazza, G. Di Cocco, Givi N. Kimeridze, M. Rapisarda, Massimo Frutti, S. Sabatini, I. Lapshov, F. Lazzarotto, A. Pellizzoni, E. Costa, Martino Marisaldi, M. Tavani, E. Vallazza, C. M. Raiteri, A. Trois, M. Pilia, H. Y. Hsiao, Omar M. Kurtanidze, Valeri M. Larionov, M. Prest, M. Roca-Sogorb, A. W. Chen, P. W. Cattaneo, P. Soffitta, Hugh D. Aller, V. Cocco, A. Giuliani, M. Orienti, M. Villata, Mauro Dolci, M. Trifoglio, Elina Lindfors, J. L. Gomez, P. Romano, Alan P. Marscher, P. Giommi, Anne Lähteenmäki, David Hiriart, G. Barbiellini, Ekaterina Koptelova, G. Giovannini, F. Longo, S. Vercellone, L. O. Takalo, E. N. Kopatskaya, M. Galli, F. Verrecchia, D. Blinov, F., D'Ammando, C. M., Raiteri, M., Villata, P., Romano, G., Pucella, H. A., Krimm, S., Covino, M., Orienti, G., Giovannini, S., Vercellone, E., Pian, I., Donnarumma, V., Vittorini, M., Tavani, A., Argan, G., Barbiellini, F., Boffelli, A., Bulgarelli, P., Caraveo, P. W., Cattaneo, A. W., Chen, V., Cocco, E., Costa, Monte, E., Paris, G., Cocco, G., Y., Evangelista, M., Feroci, A., Ferrari, M., Fiorini, T., Froysland, M., Frutti, F., Fuschino, M., Galli, F., Gianotti, A., Giuliani, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, Longo, Francesco, M., Marisaldi, S., Mereghetti, A., Morselli, L., Pacciani, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Pilia, G., Porrovecchio, M., Prest, M., Rapisarda, A., Rappoldi, A., Rubini, S., Sabatini, P., Soffitta, E., Striani, M., Trifoglio, A., Troi, E., Vallazza, A., Zambra, D., Zanello, I., Agudo, H. D., Aller, M. F., Aller, A. A., Arkharov, U., Bach, E., Benitez, A., Berdyugin, D. A., Blinov, C. S., Buemi, W. P., Chen, Paola, A., M., Dolci, E., Forne, L., Fuhrmann, J. L., Gomez, M. A., Gurwell, B., Jordan, S. G., Jorstad, J., Heidt, D., Hiriart, T., Hovatta, H. Y., Hsiao, G., Kimeridze, T. S., Konstantinova, E. N., Kopatskaya, E., Koptelova, O. M., Kurtanidze, S. O., Kurtanidze, V. M., Larionov, A., L\ahteenm\aki, P., Leto, E., Lindfor, A. P., Marscher, B., Mcbreen, I. M., Mchardy, D. A., Morozova, K., Nilsson, M., Pasanen, M., Roca Sogorb, A., Sillanp\a\a, L. O., Takalo, M., Tornikoski, C., Trigilio, I. S., Troitsky, G., Umana, L. A., Antonelli, S., Colafrancesco, C., Pittori, P., Santolamazza, F., Verrecchia, P., Giommi, L., Salotti, Anne Lähteenmäki Group, Aalto-yliopisto, and Aalto University

Subjects
Photon, Astrophysics::High Energy Astrophysical Phenomena, education, galaxies: active, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Spectral line, law.invention, law, quasars: general, 0103 physical sciences, individual: PKS 1510-089 [quasars], Electronic band structure, Blazar, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, general [quasars], 010308 nuclear & particles physics, Gamma ray, Astronomy and Astrophysics, gamma rays: general, quasars: individual: PKS 1510-089, radiation mechanisms: non-thermal, non-thermal [radiation mechanisms], Synchrotron, Space and Planetary Science, active [galaxies], Peak level, Astrophysics - High Energy Astrophysical Phenomena, general [gamma rays], Flare
Abstract

We report on the extreme gamma-ray activity from the FSRQ PKS 1510-089 observed by AGILE in March 2009. In the same period a radio-to-optical monitoring of the source was provided by the GASP-WEBT and REM. Moreover, several Swift ToO observations were triggered, adding important information on the source behaviour from optical/UV to hard X-rays. We paid particular attention to the calibration of the Swift/UVOT data to make it suitable to the blazars spectra. Simultaneous observations from radio to gamma rays allowed us to study in detail the correlation among the emission variability at different frequencies and to investigate the mechanisms at work. In the period 9-30 March 2009, AGILE detected an average gamma-ray flux of (311+/-21)x10^-8 ph cm^-2 s^-1 for E>100 MeV, and a peak level of (702+/-131)x10^-8 ph cm^-2 s^-1 on daily integration. The gamma-ray activity occurred during a period of increasing activity from near-IR to UV, with a flaring episode detected on 26-27 March 2009, suggesting that a single mechanism is responsible for the flux enhancement observed from near-IR to UV. By contrast, Swift/XRT observations seem to show no clear correlation of the X-ray fluxes with the optical and gamma-ray ones. However, the X-ray observations show a harder photon index (1.3-1.6) with respect to most FSRQs and a hint of harder-when-brighter behaviour, indicating the possible presence of a second emission component at soft X-ray energies. Moreover, the broad band spectrum from radio-to-UV confirmed the evidence of thermal features in the optical/UV spectrum of PKS 1510-089 also during high gamma-ray state. On the other hand, during 25-26 March 2009 a flat spectrum in the optical/UV energy band was observed, suggesting an important contribution of the synchrotron emission in this part of the spectrum during the brightest gamma-ray flare, therefore a significant shift of the synchrotron peak., 13 pages, 7 figures, 3 tables. Accepted for publication in Astronomy and Astrophysics

Published
2011

19. Flaring Behavior of the Quasar 3C~454.3 across the Electromagnetic Spectrum

Author

Merja Tornikoski, Brian Taylor, Omar M. Kurtanidze, Francesca D. D'Arcangelo, Svetlana G. Jorstad, Daria A. Melnichuk, Anne Lähteenmäki, Helmut Wiesemeyer, B. Jordan, Gary D. Schmidt, Paul S. Smith, Elena G. Larionova, Alex Markowitz, Tatiana S. Konstantinova, Mar Roca-Sogorb, Evgenia N. Kopatskaya, Clemens Thum, Vladimir A. Hagen-Thorn, Ivan Agudo, Ian M. McHardy, Brian Skiff, Ivan S. Troitsky, Valeri M. Larionov, José L. Gómez, Mark Gurwell, Dmitry A. Blinov, Givi N. Kimeridze, Alan P. Marscher, L. V. Larionova, A. A. Arkharov, A. D. Falcone, and Ritaban Chatterjee

Subjects
Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Superluminal motion, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Linear polarization, Electromagnetic spectrum, Lorentz transformation, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Quasar, Astrophysics, Position angle, Light curve, symbols.namesake, Space and Planetary Science, symbols, Blazar, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We analyze the behavior of the parsec-scale jet of the quasar 3C~454.3 during pronounced flaring activity in 2005-2008. Three major disturbances propagated down the jet along different trajectories with Lorentz factors $\Gamma>$10. The disturbances show a clear connection with millimeter-wave outbursts, in 2005 May/June, 2007 July, and 2007 December. High-amplitude optical events in the $R$-band light curve precede peaks of the millimeter-wave outbursts by 15-50 days. Each optical outburst is accompanied by an increase in X-ray activity. We associate the optical outbursts with propagation of the superluminal knots and derive the location of sites of energy dissipation in the form of radiation. The most prominent and long-lasting of these, in 2005 May, occurred closer to the black hole, while the outbursts with a shorter duration in 2005 Autumn and in 2007 might be connected with the passage of a disturbance through the millimeter-wave core of the jet. The optical outbursts, which coincide with the passage of superluminal radio knots through the core, are accompanied by systematic rotation of the position angle of optical linear polarization. Such rotation appears to be a common feature during the early stages of flares in blazars. We find correlations between optical variations and those at X-ray and $\gamma$-ray energies. We conclude that the emergence of a superluminal knot from the core yields a series of optical and high-energy outbursts, and that the mm-wave core lies at the end of the jet's acceleration and collimation zone., Comment: 57 pages, 23 figures, 8 tables (submitted to ApJ)

Published
2010

20. AGILE detection of a rapid gamma-ray flare from the blazar PKS 1510-089 during the GASP-WEBT monitoring

Author

Dario Gasparrini, A. W. Chen, Alan P. Marscher, P. Giommi, C. Pittori, Filippo D'Ammando, T. Froysland, A. Argan, Andrea Bulgarelli, Enrico Costa, M. Sorcia, Carla Buemi, F. Fuschino, Svetlana G. Jorstad, Massimo Rapisarda, Marco Feroci, Arnaud Ferrari, Luigi Pacciani, Uwe Bach, Corrado Trigilio, F. Boffelli, G. De Paris, Jochen Heidt, L. A. Antonelli, Deborah Dultzin, F. Perotti, Raúl Mújica, C. M. Raiteri, Lars Fuhrmann, G. Umana, D. Zanello, A. Zambra, A. Morselli, Mark Gurwell, Paolo Soffitta, Margo F. Aller, Kari Nilsson, Marco Tavani, E. Vallazza, Wen Ping Chen, Tatiana S. Konstantinova, S. Sabatini, I. M. McHardy, Ekaterina Koptelova, A. Rappoldi, M. Fiorini, Ivan Agudo, Martino Marisaldi, José L. Gómez, V. Cocco, J. M. Lopez, Valeri M. Larionov, S. Vercellone, Elina Lindfors, A. Pellizzoni, E. Del Monte, H. Y. Hsiao, G. Pucella, F. Longo, I. Lapshov, L. Salotti, Ivan S. Troitsky, A. Giuliani, Sandro Mereghetti, Paolo Lipari, L. O. Takalo, Mar Roca-Sogorb, P. W. Cattaneo, Omar M. Kurtanidze, Brian W. Taylor, G. Di Rico, M. Trifoglio, David Hiriart, S. Colafrancesco, P. Picozza, G. Barbiellini, G. Piano, Hugh D. Aller, Fulvio Gianotti, Maura Pilia, Alessio Trois, A. A. Arkharov, B. Preger, G. Di Cocco, Givi N. Kimeridze, S. Cutini, Claudio Labanti, Erika Benítez, P. Santolamazza, I. Donnarumma, Y. Evangelista, A. Di Paola, M. Galli, E. N. Kopatskaya, P. A. Caraveo, Paolo Leto, F. Verrecchia, Michael Mommert, Francesco Lazzarotto, Andrei Berdyugin, M. Pasanen, D. A. Melnichuk, M. Prest, M. Villata, D. Blinov, V. Vittorini, DAmmando F, Pucella G, Raiteri CM, Villata M, Vittorini V, Vercellone S, Donnarumma I, Longo F, Tavani M, Argan A, Barbiellini G, Boffelli F, Bulgarelli A, Caraveo P, Cattaneo PW, Chen AW, Cocco V, Costa E, Del Monte E, De Paris G, Di Cocco G, Evangelista Y, Feroci M, Ferrari A, Fiorini M, Froysland T, Fuschino F, Galli M, Gianotti F, Giuliani A, Labanti C, Lapshov I, Lazzarotto F, Lipari P, Marisaldi M, Mereghetti S, Morselli A, Pacciani L, Pellizzoni A, Perotti F, Piano G, Picozza P, Pilia M, Prest M, Rapisarda M, Rappoldi A, Sabatini S, Soffitta P, Trifoglio M, Trois A, Vallazza E, Zambra A, Zanello D, Agudo I, Aller MF, Aller HD, Arkharov AA, Bach U, Benitez E, Berdyugin A, Blinov DA, Buemi CS, Chen WP, Di Paola A, Di Rico G, Dultzin D, Fuhrmann L, Gomez JL, Gurwell MA, Jorstad SG, Heidt J, Hiriart D, Hsiao HY, Kimeridze G, Konstantinova TS, Kopatskaya EN, Koptelova E, Kurtanidze O, Larionov VM, Leto P, Lindfors E, Lopez JM, Marscher AP, McHardy IM, Melnichuk DA, Mommert M, Mujica R, Nilsson K, Pasanen M, Roca-Sogorb M, Sorcia M, Takalo LO, Taylor B, Trigilio C, Troitsky IS, Umana G, Antonelli LA, Colafrancesco S, Cutini S, Gasparrini D, Pittori C, Preger B, Santolamazza P, Verrecchia F, Giommi P, Salotti L, F., D'Ammando, G., Pucella, C. M., Raiteri, M., Villata, V., Vittorini, S., Vercellone, I., Donnarumma, Longo, Francesco, M., Tavani, A., Argan, G., Barbiellini, F., Boffelli, A., Bulgarelli, P., Caraveo, P. W., Cattaneo, A. W., Chen, V., Cocco, E., Costa, E. D., Monte, G. D., Pari, G. D., Cocco, Y., Evangelista, M., Feroci, A., Ferrari, M., Fiorini, T., Froysland, F., Fuschino, M., Galli, F., Gianotti, A., Giuliani, C., Labanti, I., Lapshov, F., Lazzarotto, P., Lipari, M., Marisaldi, S., Mereghetti, A., Morselli, L., Pacciani, A., Pellizzoni, F., Perotti, G., Piano, P., Picozza, M., Pilia, M., Prest, M., Rapisarda, A., Rappoldi, S., Sabatini, P., Soffitta, M., Trifoglio, A., Troi, E., Vallazza, A., Zambra, D., Zanello, I., Agudo, M. F., Aller, H. D., Aller, A. A., Arkharov, U., Bach, E., Benitez, A., Berdyugin, D. A., Blinov, C. S., Buemi, W. P., Chen, A. D., Paola, G. D., Rico, D., Dultzin, L., Fuhrmann, J. L., Gomez, M. A., Gurwell, S. G., Jorstad, J., Heidt, D., Hiriart, H. Y., Hsiao, G., Kimeridze, T. S., Konstantinova, E. N., Kopatskaya, E., Koptelova, O., Kurtanidze, V. M., Larionov, P., Leto, E., Lindfor, J. M., Lopez, A. P., Marscher, I. M., Mchardy, D. A., Melnichuk, M., Mommert, R., Mujica, K., Nilsson, M., Pasanen, M., Roca Sogorb, M., Sorcia, L. O., Takalo, B., Taylor, C., Trigilio, I. S., Troitsky, G., Umana, L. A., Antonelli, S., Colafrancesco, S., Cutini, D., Gasparrini, C., Pittori, B., Preger, P., Santolamazza, F., Verrecchia, P., Giommi, and L., Salotti

Subjects
Agile, Active galactic nucleus, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Radio spectrum, gamma-ray flare, High Energy Gamma-ray Astronomy, AGILE satellite, Active Galactic Nuclei, law.invention, law, quasar, Blazar, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Gamma ray, Compton scattering, Astronomy and Astrophysics, Quasar, Space and Planetary Science, gamma-rays: observations – mechanism: non-thermal – quasars: individual (PKS 1510-089), Spectral energy distribution, Astrophysics - High Energy Astrophysical Phenomena, Flare, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We report the detection by the AGILE satellite of a rapid gamma-ray flare from the powerful gamma-ray quasar PKS 1510-089, during a pointing centered on the Galactic Center region from 1 March to 30 March 2008. This source has been continuosly monitored in the radio-to-optical bands by the GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT). Moreover, the gamma-ray flaring episode triggered three ToO observations by the Swift satellite in three consecutive days, starting from 20 March 2008. In the period 1-16 March 2008, AGILE detected gamma-ray emission from PKS 1510-089 at a significance level of 6.2-sigma with an average flux over the entire period of (84 +/- 17) x 10^{-8} photons cm^{-2} s^{-1} for photon energies above 100 MeV. After a predefined satellite re-pointing, between 17 and 21 March 2008, AGILE detected the source at a significance level of 7.3-sigma, with an average flux (E > 100 MeV) of (134 +/- 29) x 10^{-8} photons cm^{-2} s^{-1} and a peak level of (281 +/- 68) x 10^{-8} photons cm^{-2} s^{-1} with daily integration. During the observing period January-April 2008, the source also showed an intense and variable optical activity, with several flaring episodes and a significant increase of the flux was observed at millimetric frequencies. Moreover, in the X-ray band the Swift/XRT observations seem to show an harder-when-brighter behaviour of the source spectrum. The spectral energy distribution of mid-March 2008 is modelled with a homogeneous one-zone synchrotron self Compton emission plus contributions from inverse Compton scattering of external photons from both the accretion disc and the broad line region. Indeed, some features in the optical-UV spectrum seem to indicate the presence of Seyfert-like components, such as the little blue bump and the big blue bump., 10 pages, 4 figures and 2 tables, accepted for publication in A&A

Published
2009

21. Multi-frequency monitoring of gamma-ray loud blazars: I. Light curves and spectral energy distributions

Author

E. Forne, Carla Buemi, Paolo Leto, L. Lanteri, Uwe Bach, Corrado Trigilio, G. Umana, C. M. Raiteri, Valeri M. Larionov, Giuseppe Maccaferri, Andrea Orlati, Omar M. Kurtanidze, L. Fuhrmann, Mauro Dolci, E. N. Kopatskaya, J. A. Ros, G. Tosti, J. M. Coloma, Tatiana S. Konstantinova, V. A. Hagen-Thorn, M. G. Nikolashvili, M. Villata, A. Di Paola, Mansur Ibrahimov, A. A. Arkharov, and N. V. Efimova

Subjects
Physics, Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, Astrophysics (astro-ph), Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Context (language use), Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, galaxies: jets, Light curve, Spectral line, Luminosity, galaxies: quasars: general, Astrophysical jet, Space and Planetary Science, general, galaxies: BL Lacertae objects, Blazar, Astrophysics::Galaxy Astrophysics
Abstract

Context: Being dominated by non-thermal emission from aligned relativistic jets, blazars allow us to elucidate the physics of extragalactic jets, and, ltimately, how the energy is extracted from the central black hole in radio-loud active galactic nuclei. Aims: Crucial information is provided by broad-band spectral energy distributions (SEDs), their trends with luminosity and correlated multi-frequency variability. With this study we plan to obtain a database of contemporaneous radio-to-optical spectra of a sample of blazars, which are and will be observed by current and future high-energy satellites. Methods: Since December 2004 we are performing a monthly multi-frequency radio monitoring of a sample of 35 blazars at the antennas in Medicina and Noto. Contemporaneous near-IR and optical observations for all our observing epochs are organised. Results: Until June 2006 about 4000 radio measurements and 5500 near-IR and optical measurements were obtained. Most of the sources show significant variability in all observing bands. Here we present the multi-frequency data acquired during the first eighteen months of the project, and construct the SEDs for the best-sampled sources., Comment: 16 pages, 3 large figures, accepted for publication in A&A

Published
2006
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22. GRB 021004 modelled by multiple energy injections

Author

Andrea Boattini, M. N. Bremer, A. Guarnieri, Einar H. Gudmundsson, Nial R. Tanvir, Stefano Covino, A. J. Castro-Tirado, Martin Jelínek, G. Ghisellini, Corrado Bartolini, Adalberto Piccioni, T. Fathkullin, S. Klose, P. Ruiz-Lapuente, Gudlaugur Johannesson, Eliana Palazzi, Tatiana S. Konstantinova, D. Malesani, A. Campo Bagatin, A. de Ugarte Postigo, L. Wisotzki, F. Mannucci, U. Thiele, S. Guzyi, V. V. Sokolov, J. Aceituno, Mauro Stefanon, J. M. Castro Cerón, Gunnlaugur Björnsson, Vincenzo Testa, A. A. Henden, L. K. Hunt, Paul J. Tristram, Soojong Pak, A. Di Paola, Nicolás Cardiel, G. Pizzichini, D. Fugazza, S. Huferath, M. Del Principe, D. Perez-Ramirez, Y. Kurata, Elena Pian, J. Gorosabel, L. A. Antonelli, N. Masetti, A. de Ugarte Postigo, A. J. Castro-Tirado, J. Gorosabel, G. Jóhannesson, G. Björnsson, E. H. Gudmundsson, M. Bremer, S. Pak, N. Tanvir, J. M. Castro Cerón, S. Guzyi, M. Jelínek, S. Klose, D. Pérez-Ramírez, J. Aceituno, A. Campo Bagatín, S. Covino, N. Cardiel, T. Fathkullin, A. A. Henden, S. Huferath, Y. Kurata, D. Malesani, F. Mannucci, P. Ruiz-Lapuente, V. Sokolov, U. Thiele, L. Wisotzki, L. A. Antonelli, C. Bartolini, A. Boattini, A. Guarnieri, A. Piccioni, G. Pizzichini, M. del Principe, A. di Paola, D. Fugazza, G. Ghisellini, L. Hunt, T. Konstantinova, N. Masetti, E. Palazzi, E. Pian, M. Stefanon, and V. Testa and P. J. Tristram

Subjects
Astrofísica, genetic structures, Astrophysics::High Energy Astrophysical Phenomena, Extinction (astronomy), FOS: Physical sciences, Astrophysics, Collimated light, MODEL OF MULTIPLE INJECTIONS, Photometry (optics), GAMMA-RAY OBSERVATIONS, GAMMA-RAY BURSTS, Physics, Astrophysics (astro-ph), Física atmosférica, Astronomy and Astrophysics, Light curve, X-RAY OBSERVATIONS, eye diseases, Galaxy, Afterglow, Astronomía, Space and Planetary Science, Millimeter, Gamma-ray burst, OPTICAL OBSERVATIONS, hormones, hormone substitutes, and hormone antagonists
Abstract

GRB 021004 is one of the best sampled gamma-ray bursts (GRB) to date, although the nature of its light curve is still being debated. Here we present a large amount (107) of new optical, near-infrared (NIR) and millimetre observations, ranging from 2 hours to more than a year after the burst. Fitting the multiband data to a model based on multiple energy injections suggests that at least 7 refreshed shocks took place during the evolution of the afterglow, implying a total energy release (collimated within an angle of 1.8 deg) of ~ 8x10^51 erg. Analysis of the late photometry reveals that the GRB 021004 host is a low extinction (Av ~ 0.1) starburst galaxy with M_B ~ -22.0., 9 pages, 5 figures, accepted for publication in A&Ax

Published
2005

23. A TIGHT CONNECTION BETWEEN GAMMA-RAY OUTBURSTS AND PARSEC-SCALE JET ACTIVITY IN THE QUASAR 3C 454.3

Author

Dmitry A. Blinov, José L. Gómez, Vladimir A. Hagen-Thorn, Givi N. Kimeridze, Sofia O. Kurtanidze, Merja Tornikoski, Jeremy D. Maune, Ivan Agudo, Stephanie Sallum, Terri L. Scott, Dirk Grupe, Maria G. Nikolashvili, Omar M. Kurtanidze, Mark Gurwell, Tatiana S. Konstantinova, K. Blumenthal, Sigua A. Lorand, R. A. Chigladze, Karen E. Williamson, Manasvita Joshi, Ivan S. Troitsky, Carolina Casadio, Anne Lähteenmäki, Daria A. Morozova, V. Strelnitski, G. Walker, Svetlana G. Jorstad, Alan P. Marscher, Valeri M. Larionov, Brian W. Taylor, Gary D. Schmidt, Evgenia N. Kopatskaya, Ian M. McHardy, Sol N. Molina, Clemens Thum, Natatia V. Efimova, H. Richard Miller, Elena G. Larionova, Joseph R. Eggen, Arkady A. Arkharov, Paul S. Smith, Ann E. Wehrle, L. V. Larionova, Nicholas R. MacDonald, Santina Consiglio, Anne Lähteenmäki Group, Aalto-yliopisto, and Aalto University

Subjects
Astrophysics::High Energy Astrophysical Phenomena, education, jets [galaxies], FOS: Physical sciences, Astrophysics, law.invention, photometric [techniques], law, polarimetric [techniques], Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Galaxy Astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Superluminal motion, Linear polarization, individual: 3C 454.3 [quasars], Astronomy and Astrophysics, Optical polarization, Quasar, Magnetic reconnection, interferometric [techniques], CTA-102, Amplitude, Space and Planetary Science, active [galaxies], Astrophysics - High Energy Astrophysical Phenomena, Flare
Abstract

We analyze the multifrequency behavior of the quasar 3C 454.3 during three prominent \gamma-ray outbursts: 2009 Autumn, 2010 Spring, and 2010 Autumn. The data reveal a repeating pattern, including a triple flare structure, in the properties of each \gamma-ray outburst, which implies similar mechanism(s) and location for all three events. The multi-frequency behavior indicates that the lower frequency events are co-spatial with the \gamma-ray outbursts, although the \gamma-ray emission varies on the shortest timescales. We determine that the variability from UV to IR wavelengths during an outburst results from a single synchrotron component whose properties do not change significantly over the different outbursts. Despite a general increase in the degree of optical linear polarization during an outburst, the polarization drops significantly at the peak of the \gamma-ray event, which suggests that both shocks and turbulent processes are involved. We detect two disturbances (knots) with superluminal apparent speeds in the parsec-scale jet associated with the outbursts in 2009 Autumn and 2010 Autumn. The kinematic properties of the knots can explain the difference in amplitudes of the \gamma-ray events, while their millimeter-wave polarization is related to the optical polarization during the outbursts. We interpret the multi-frequency behavior within models involving either a system of standing conical shocks or magnetic reconnection events located in the parsec-scale millimeter-wave core of the jet. We argue that \gamma-ray outbursts with variability timescales as short as ~ 3 hr can occur on parsec scales if flares take place in localized regions such as turbulent cells., Comment: 80 pages, 10 Tables, 31 figures, accepted for publication in ApJ

Published
2013

24. Connection between parsec-scale radio jet and gamma-ray flares in the blazar 1156+295

Author

E. N. Kopatskaya, E. Nieppola, Jonathan León-Tavares, Alan P. Marscher, Iván Agudo, Svetlana G. Jorstad, Joni Tammi, E. Valtaoja, Merja Tornikoski, Vladimir A. Hagen-Thorn, Ian M. McHardy, Sol N. Molina, Ivan S. Troitsky, Carolina Casadio, Anne Lähteenmäki, Margo F. Aller, Nicholas R. MacDonald, José L. Gómez, V. Ramakrishnan, Elena G. Larionova, Brian W. Taylor, Tatiana S. Konstantinova, N. Lavonen, L. V. Larionova, Mark Gurwell, Manasvita Joshi, Daria A. Morozova, Elizaveta Rastorgueva-Foi, Dmitry A. Blinov, Emilia Järvelä, Valeri M. Larionov, N. V. Efimova, and K. Wiik

Subjects
Physics, Connection (fibred manifold), Jet (fluid), Scale (ratio), Gamma ray, Astrophysics, Blazar, Parsec

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