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17 results on '"Testa, Vincenzo"'

1. Chasing the Break: Tracing the Full Evolution of a Black Hole X-Ray Binary Jet with Multiwavelength Spectral Modeling

Author

Echiburú-Trujillo, Constanza, primary, Tetarenko, Alexandra J., additional, Haggard, Daryl, additional, Russell, Thomas D., additional, Koljonen, Karri I. I., additional, Bahramian, Arash, additional, Wang, Jingyi, additional, Bremer, Michael, additional, Bright, Joe, additional, Casella, Piergiorgio, additional, Russell, David M., additional, Altamirano, Diego, additional, Baglio, M. Cristina, additional, Belloni, Tomaso, additional, Ceccobello, Chiara, additional, Corbel, Stephane, additional, Diaz Trigo, Maria, additional, Maitra, Dipankar, additional, Gabuya, Aldrin, additional, Gallo, Elena, additional, Heinz, Sebastian, additional, Homan, Jeroen, additional, Kara, Erin, additional, Körding, Elmar, additional, Lewis, Fraser, additional, Lucchini, Matteo, additional, Markoff, Sera, additional, Migliari, Simone, additional, Miller-Jones, James C. A., additional, Rodriguez, Jerome, additional, Saikia, Payaswini, additional, Sarazin, Craig L., additional, Shahbaz, Tariq, additional, Sivakoff, Gregory, additional, Soria, Roberto, additional, Testa, Vincenzo, additional, Tetarenko, Bailey E., additional, and Tudose, Valeriu, additional

Published
2024
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3. A Multiwavelength Study of GRS 1716-249 in Outburst: Constraints on Its System Parameters

Author

Saikia, Payaswini, primary, Russell, David M., additional, Baglio, M. C., additional, Bramich, D. M., additional, Casella, Piergiorgio, additional, Trigo, Maria Diaz, additional, Gandhi, Poshak, additional, Jiang, Jiachen, additional, Maccarone, Thomas, additional, Soria, Roberto, additional, Al Noori, Hind, additional, Al Yazeedi, Aisha, additional, Alabarta, Kevin, additional, Belloni, Tomaso, additional, Bel, Marion Cadolle, additional, Ceccobello, Chiara, additional, Corbel, Stéphane, additional, Fender, Rob, additional, Gallo, Elena, additional, Homan, Jeroen, additional, Koljonen, Karri, additional, Lewis, Fraser, additional, Markoff, Sera B., additional, Miller-Jones, James C. A., additional, Rodriguez, Jerome, additional, Russell, Thomas D., additional, Shahbaz, Tariq, additional, Sivakoff, Gregory R., additional, Testa, Vincenzo, additional, and Tetarenko, Alexandra J., additional

Published
2022
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4. A Wildly Flickering Jet in the Black Hole X-Ray Binary MAXI J1535–571

Author

Cristina Baglio, Maria, primary, Russell, David M., additional, Casella, Piergiorgio, additional, Al Noori, Hind, additional, Al Yazeedi, Aisha, additional, Belloni, Tomaso, additional, Buckley, David A. H., additional, Cadolle Bel, Marion, additional, Ceccobello, Chiara, additional, Corbel, Stephane, additional, Coti Zelati, Francesco, additional, Díaz Trigo, Maria, additional, Fender, Rob P., additional, Gallo, Elena, additional, Gandhi, Poshak, additional, Homan, Jeroen, additional, Koljonen, Karri I. I., additional, Lewis, Fraser, additional, Maccarone, Thomas J., additional, Malzac, Julien, additional, Markoff, Sera, additional, Miller-Jones, James C. A., additional, O’Brien, Kieran, additional, Russell, Thomas D., additional, Saikia, Payaswini, additional, Shahbaz, Tariq, additional, Sivakoff, Greg R., additional, Soria, Roberto, additional, Testa, Vincenzo, additional, Tetarenko, Alexandra J., additional, van den Ancker, Mario E., additional, and Vincentelli, Federico M., additional

Published
2018
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5. Variable Stars and Stellar Populations in Andromeda XXVII. IV. An Off-centered, Disrupted Galaxy

Author

Cusano, Felice, primary, Garofalo, Alessia, additional, Clementini, Gisella, additional, Cignoni, Michele, additional, Muraveva, Tatiana, additional, Tessicini, Gianni, additional, Testa, Vincenzo, additional, Paris, Diego, additional, Federici, Luciana, additional, Marconi, Marcella, additional, Ripepi, Vincenzo, additional, and Musella, Ilaria, additional

Published
2017
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8. DWARF SPHEROIDAL SATELLITES OF M31. I. VARIABLE STARS AND STELLAR POPULATIONS IN ANDROMEDA XIX

Author

Cusano, Felice, primary, Clementini, Gisella, additional, Garofalo, Alessia, additional, Cignoni, Michele, additional, Federici, Luciana, additional, Marconi, Marcella, additional, Musella, Ilaria, additional, Ripepi, Vincenzo, additional, Boutsia, Konstantina, additional, Fumana, Marco, additional, Gallozzi, Stefano, additional, and Testa, Vincenzo, additional

Published
2013
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9. THE GRAY NEEDLE: LARGE GRAINS IN THE HD 15115 DEBRIS DISK FROM LBT/PISCES/KsAND LBTI /LMIRcam/L′ ADAPTIVE OPTICS IMAGING

Author

Rodigas, Timothy J., primary, Hinz, Philip M., additional, Leisenring, Jarron, additional, Vaitheeswaran, Vidhya, additional, Skemer, Andrew J., additional, Skrutskie, Michael, additional, Su, Kate Y. L., additional, Bailey, Vanessa, additional, Schneider, Glenn, additional, Close, Laird, additional, Mannucci, Filippo, additional, Esposito, Simone, additional, Arcidiacono, Carmelo, additional, Pinna, Enrico, additional, Argomedo, Javier, additional, Agapito, Guido, additional, Apai, Daniel, additional, Bono, Giuseppe, additional, Boutsia, Kostantina, additional, Briguglio, Runa, additional, Brusa, Guido, additional, Busoni, Lorenzo, additional, Cresci, Giovanni, additional, Currie, Thayne, additional, Desidera, Silvano, additional, Eisner, Josh, additional, Falomo, Renato, additional, Fini, Luca, additional, Follette, Kate, additional, Fontana, Adriano, additional, Garnavich, Peter, additional, Gratton, Raffaele, additional, Green, Richard, additional, Guerra, Juan Carlos, additional, Hill, J. M., additional, Hoffmann, William F., additional, Jones, Terry J., additional, Krejny, Megan, additional, Kulesa, Craig, additional, Males, Jared, additional, Masciadri, Elena, additional, Mesa, Dino, additional, McCarthy, Don, additional, Meyer, Michael, additional, Miller, Doug, additional, Nelson, Matthew J., additional, Puglisi, Alfio, additional, Quiros-Pacheco, Fernando, additional, Riccardi, Armando, additional, Sani, Eleonora, additional, Stefanini, Paolo, additional, Testa, Vincenzo, additional, Wilson, John, additional, Woodward, Charles E., additional, and Xompero, Marco, additional

Published
2012
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10. HIDE AND SEEK BETWEEN ANDROMEDA'S HALO, DISK, AND GIANT STREAM

Author

Clementini, Gisella, primary, Contreras Ramos, Rodrigo, additional, Federici, Luciana, additional, Macario, Giulia, additional, Beccari, Giacomo, additional, Testa, Vincenzo, additional, Cignoni, Michele, additional, Marconi, Marcella, additional, Ripepi, Vincenzo, additional, Tosi, Monica, additional, Bellazzini, Michele, additional, Fusi Pecci, Flavio, additional, Diolaiti, Emiliano, additional, Cacciari, Carla, additional, Marano, Bruno, additional, Giallongo, Emanuele, additional, Ragazzoni, Roberto, additional, Di Paola, Andrea, additional, Gallozzi, Stefano, additional, and Smareglia, Riccardo, additional

Published
2011
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11. The Elongated Structure of the Hercules Dwarf Spheroidal Galaxy from Deep Large Binocular Telescope Imaging

Author

Coleman, Matthew G., primary, de Jong, Jelte T. A., additional, Martin, Nicolas F., additional, Rix, Hans-Walter, additional, Sand, David J., additional, Bell, Eric F., additional, Pogge, Richard W., additional, Thompson, David J., additional, Hippelein, H., additional, Giallongo, E., additional, Ragazzoni, R., additional, DiPaola, Andrea, additional, Farinato, Jacopo, additional, Smareglia, Riccardo, additional, Testa, Vincenzo, additional, Bechtold, Jill, additional, Hill, John M., additional, Garnavich, Peter M., additional, and Green, Richard F., additional

Published
2007
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16. A Multiwavelength Study of PSR B0628-28: The First Overluminous Rotation-powered Pulsar?

Author

Becker, Werner, Jessner, Axel, Kramer, Michael, Testa, Vincenzo, and Howaldt, Clemens

Abstract

The ROSAT source RX J0630.8-2834 was suggested by positional coincidence to be the X-ray counterpart of the pulsar PSR B0628-28. This association, however, was regarded to be unlikely on the basis of the computed energetics of the putative X-ray counterpart. In this paper we report on multiwavelength observations of PSR B0628-28 made with the ESO NTT observatory in La Silla, the Lovell telescope at Jodrell Bank, and XMM-Newton. Although the optical observations do not detect any counterpart of RX J0630.8-2834 down to a limiting magnitude of V = 26.1 mag and B = 26.3 mag, XMM-Newton observations finally confirm it to be the pulsar's X-ray counterpart by detecting X-ray pulses with the radio pulsar's spin period. The X-ray pulse profile is not sinusoidal but characterized by a two-component pulse profile, consisting of a broad peak with a second narrow pulse leading the main pulse by ~144deg. The fraction of pulsed photons is (39 +- 6)% with no strong energy dependence in the XMM-Newton bandpass. The pulsar's X-ray spectrum is well described by a power law with photon index a = 2.63img1.gif. A composite Planckian-plus-power-law spectral model yields an interesting alternative that formally describes the observed energy spectrum equally well. Inferred from best fits are a blackbody temperature of ~1.7 x 106 K and a projected blackbody radius of ~69img2.gif m, yielding a thermal flux contribution of ~20% within the 0.1-2.4 keV band. The pulsar's spin-down to X-ray energy conversion efficiency as obtained from the single-power-law spectral model is ~16%, assuming the distance inferred from the radio dispersion measure. If confirmed, PSR B0628-28 would be the first X-ray-overluminous rotation-powered pulsar identified among all ~1400 radio pulsars known today. The emission beam geometry of PSR B0628-28 is estimated from radio polarization data taken at 408 and 1400 MHz. A formal best fit of the 1400 MHz data yields a ~ 11deg for the inclination of the magnetic axis to the rotation axis and b ~ -3deg for the impact angle of the line of sight. A combination of results obtained from 408 and 1400 MHz data, however, makes a nearly orthogonal solution, with a ~ 70deg and b ~ -12deg the most likely one.

Published
2005

17. Chandra X-Ray Observatory Observations of the Globular Cluster M28 and Its Millisecond Pulsar PSR B1821-24

Author

Becker, Werner, Swartz, Douglas A., Pavlov, George G., Elsner, Ronald F., Grindlay, Jonathan, Mignani, Roberto, Tennant, Allyn F., Backer, Don, Pulone, Luigi, Testa, Vincenzo, and Weisskopf, Martin C.

Abstract

We report here the results of the first Chandra X-Ray Observatory observations of the globular cluster M28 (NGC 6626). We detect 46 X-ray sources, of which 12 lie within 1 core radius of the center. We show that the apparently extended X-ray core emission seen with the ROSAT HRI is due to the superposition of multiple discrete sources, for which we determine the X-ray luminosity function down to a limit of about 6 x 1030 ergs s-1. We measure the radial distribution of the X-ray sources and fit it to a King profile finding a core radius of rc,X [?] 11''. We measure for the first time the unconfused phase-averaged X-ray spectrum of the 3.05 ms pulsar B1821-24 and find that it is best described by a power law with photon index G [?] 1.2. We find marginal evidence of an emission line centered at 3.3 keV in the pulsar spectrum, which could be interpreted as cyclotron emission from a corona above the pulsar's polar cap if the magnetic field is strongly different from a centered dipole. The unabsorbed pulsar flux in the 0.5-8.0 keV band is [?]3.5 x 10-13 ergs s-1 cm-2. We present spectral analyses of the five brightest unidentified sources. Based on the spectral parameters of the brightest of these sources, we suggest that it is a transiently accreting neutron star in a low-mass X-ray binary, in quiescence. Fitting its spectrum with a hydrogen neutron star atmosphere model yields the effective temperature Timg1.gif = 90img2.gif eV and the radius Rimg3.gif = 14.5img4.gif km. In addition to the resolved sources, we detect fainter, unresolved X-ray emission from the central core. Using the Chandra-derived positions, we also report on the result of searching archival Hubble Space Telescope data for possible optical counterparts.

Published
2003

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