Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Lansbury, George"'
Autor:
Boorman, Peter G., Gandhi, Poshak, Buchner, Johannes, Stern, Daniel, Ricci, Claudio, Baloković, Mislav, Asmus, Daniel, Harrison, Fiona A., Svoboda, Jiří, Greenwell, Claire, Koss, Michael, Alexander, David M., Annuar, Adlyka, Bauer, Franz, Brandt, William N., Brightman, Murray, Panessa, Francesca, Chen, Chien-Ting J., Farrah, Duncan, Forster, Karl, Grefenstette, Brian, Hönig, Sebastian F., Hill, Adam B., Kammoun, Elias, Lansbury, George, Lanz, Lauranne, LaMassa, Stephanie, Madsen, Kristin, Marchesi, Stefano, Middleton, Matthew, Mingo, Beatriz, Parker, Michael L., Treister, Ezequiel, Ueda, Yoshihiro, Urry, C. Megan, Zappacosta, Luca
Hard X-ray-selected samples of Active Galactic Nuclei (AGN) provide one of the cleanest views of supermassive black hole accretion, but are biased against objects obscured by Compton-thick gas column densities of $N_{\rm H}$ $>$ 10$^{24}$ cm$^{-2}$.
Externí odkaz:
http://arxiv.org/abs/2410.07339
Autor:
Greenwell, Claire L., Klindt, Lizelke, Lansbury, George B., Rosario, David J., Alexander, David M., Aird, James, Stern, Daniel, Forster, Karl, Koss, Michael J., Bauer, Franz E., Ricci, Claudio, Tomsick, John, Brandt, William N., Connor, Thomas, Boorman, Peter G., Annuar, Adlyka, Ballantyne, David R., Chen, Chien-Ting, Civano, Francesca, Comastri, Andrea, Fawcett, Victoria A., Fornasini, Francesca M., Gandhi, Poshak, Harrison, Fiona, Heida, Marianne, Hickox, Ryan, Kammoun, Elias S., Lanz, Lauranne, Marchesi, Stefano, Noirot, Gaël, Romero-Colmenero, Encarni, Treister, Ezequiel, Urry, C. Megan, Väisänen, Petri, van Soelen, Brian
We present a catalog of hard X-ray serendipitous sources detected in the first 80 months of observations by the Nuclear Spectroscopic Telescope Array (NuSTAR). The NuSTAR serendipitous survey 80-month (NSS80) catalog has an unprecedented $\sim$ 62 Ms
Externí odkaz:
http://arxiv.org/abs/2404.17637
Autor:
Greenwell, Claire, Gandhi, Poshak, Stern, Daniel, Lansbury, George, Mainieri, Vincenzo, Boorman, Peter, Toba, Yoshiki
The growth of active galactic nuclei (AGN) occurs under some form of obscuration in a large fraction of the population. The difficulty in constraining this population leads to high uncertainties in cosmic X-ray background and galaxy evolution models.
Externí odkaz:
http://arxiv.org/abs/2401.01937
Autor:
LaMassa, Stephanie M., Yaqoob, Tahir, Tzanavaris, Panayiotis, Gandhi, Poshak, Heckman, Timothy, Lansbury, George, Siemiginowska, Aneta
3C 223 is a radio loud, Type 2 quasar at $z=0.1365$ with an intriguing XMM-Newton spectrum that implicated it as a rare, Compton-thick ($N_{\rm H} \gtrsim 1.25 \times 10^{24}$ cm$^{-2}$) active galactic nucleus (AGN). We obtained contemporaneous XMM-
Externí odkaz:
http://arxiv.org/abs/2301.07193
Autor:
Greenwell, Claire, Gandhi, Poshak, Lansbury, George, Boorman, Peter, Mainieri, Vincenzo, Stern, Daniel
Optically quiescent quasars (OQQs) represent a recently systematised class of infrared-luminous active galactic nuclei (AGN) which have galaxy-like optical continua. They may represent an interesting, brief phase in the AGN life cycle, e.g. either co
Externí odkaz:
http://arxiv.org/abs/2208.01627
Autor:
Holoien, Thomas W. -S., Neustadt, Jack M. M., Vallely, Patrick J., Auchettl, Katie, Hinkle, Jason T., Romero-Cañizales, Cristina, Shappee, Benjamin J., Kochanek, Christopher S., Stanek, K. Z., Chen, Ping, Dong, Subo, Prieto, Jose L., Thompson, Todd A., Brink, Thomas G., Filippenko, Alexei V., Zheng, WeiKang, Bersier, David, Bose, Subhash, Burgasser, Adam J., Channa, Sanyum, de Jaeger, Thomas, Hestenes, Julia, Im, Myungshin, Jeffers, Benjamin, Jun, Hyunsung D., Lansbury, George, Post, Richard S., Ross, Timothy W., Stern, Daniel, Tang, Kevin, Tucker, Michael A., Valenti, Stefano, Yunus, Sameen, Zhang, Keto D.
We present observations of the extremely luminous but ambiguous nuclear transient (ANT) ASASSN-17jz, spanning roughly 1200 days of the object's evolution. ASASSN-17jz was discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in the gala
Externí odkaz:
http://arxiv.org/abs/2109.07480
Autor:
Jiang, Jiachen, Baloković, Mislav, Brightman, Murray, Liu, Honghui, Harrison, Fiona A., Lansbury, George B.
We present torus modelling for the X-ray spectra of a nearby narrow-line Seyfert 1 galaxy Mrk 1239 ($z=0.0199$), based on archival Suzaku, NuSTAR and Swift observations. Our model suggests very soft intrinsic power-law continuum emission of $\Gamma\a
Externí odkaz:
http://arxiv.org/abs/2105.02078
Autor:
Greenwell, Claire, Gandhi, Poshak, Stern, Daniel, Boorman, Peter, Toba, Yoshiki, Lansbury, George, Mainieri, Vincenzo, Desira, Christopher
Many Active Galactic Nuclei (AGN) surveys rely on optical emission line signatures for robust source classification. There are, however, examples of luminous AGN candidates lacking such signatures, including those from the narrow line region, which a
Externí odkaz:
http://arxiv.org/abs/2103.12154
Autor:
Trakhtenbrot, Benny, Arcavi, Iair, Ricci, Claudio, Tacchella, Sandro, Stern, Daniel, Netzer, Hagai, Jonker, Peter G., Horesh, Assaf, Mejía-Restrepo, Julián Esteban, Hosseinzadeh, Griffin, Hallefors, Valentina, Howell, D. Andrew, McCully, Curtis, Baloković, Mislav, Heida, Marianne, Kamraj, Nikita, Lansbury, George Benjamin, Wyrzykowski, Łukasz, Gromadzki, Mariusz, Hamanowicz, Aleksandra, Cenko, S. Bradley, Sand, David J., Hsiao, Eric Y., Phillips, Mark M., Diamond, Tiara R., Kara, Erin, Gendreau, Keith C., Arzoumanian, Zaven, Remillard, Ron
Accreting supermassive black holes (SMBHs) can exhibit variable emission across the electromagnetic spectrum and over a broad range of timescales. The variability of active galactic nuclei (AGNs) in the ultraviolet and optical is usually at the few t
Externí odkaz:
http://arxiv.org/abs/1901.03731
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