Zobrazeno 1 - 10
of 579
pro vyhledávání: '"Gehrels, Neil A."'
Autor:
Krizmanic, John, Skinner, Gerald, Arzoumanian, Zaven, Badilita, Vlad, Gehrels, Neil, Gendreau, Keith, Ghodssi, Reza, Gorius, Nicolas, Morgan, Brian, Mosher, Lance, Streitmatter, Robert
In principle, diffractive optics, particularly Phase Fresnel Lenses (PFLs), offer the ability to construct large, diffraction-limited, and highly efficient X-ray/$\gamma$-ray telescopes, leading to dramatic improvement in angular resolution and photo
Externí odkaz:
http://arxiv.org/abs/2008.12810
Autor:
Langejahn, Marcus, Kadler, Matthias, Wilms, Jörn, Litzinger, Eugenia, Kreter, Michael, Gehrels, Neil, Baumgartner, Wayne H., Markwardt, Craig B., Tueller, Jack
Publikováno v:
A&A 637, A55 (2020)
Hard X-ray properties of beamed AGN have been published in the 105-month Swift/BAT catalog, but there have not been any studies carried out so far on a well-defined, radio-selected sample of low-peaked blazars in the hard X-ray band. Using the statis
Externí odkaz:
http://arxiv.org/abs/2004.00477
Autor:
Oh, Kyuseok, Koss, Michael, Markwardt, Craig B., Schawinski, Kevin, Baumgartner, Wayne H., Barthelmy, Scott D., Cenko, S. Bradley, Gehrels, Neil, Mushotzky, Richard, Petulante, Abigail, Ricci, Claudio, Lien, Amy, Trakhtenbrot, Benny
We present a catalog of hard X-ray sources detected in the first 105 months of observations with the Burst Alert Telescope (BAT) coded mask imager on board the Swift observatory. The 105 month Swift-BAT survey is a uniform hard X-ray all-sky survey w
Externí odkaz:
http://arxiv.org/abs/1801.01882
Autor:
Ricci, Claudio, Trakhtenbrot, Benny, Koss, Michael J., Ueda, Yoshihiro, Schawinski, Kevin, Oh, Kyuseok, Lamperti, Isabella, Mushotzky, Richard, Treister, Ezequiel, Ho, Luis C., Weigel, Anna, Bauer, Franz E., Paltani, Stephane, Fabian, Andrew C., Xie, Yanxia, Gehrels, Neil
The large majority of the accreting supermassive black holes in the Universe are obscured by large columns of gas and dust. The location and evolution of this obscuring material have been the subject of intense research in the past decades, and are s
Externí odkaz:
http://arxiv.org/abs/1709.09651
Autor:
Ricci, Claudio, Trakhtenbrot, Benny, Koss, Michael J., Ueda, Yoshihiro, Delvecchio, Ivan, Treister, Ezequiel, Schawinski, Kevin, Paltani, Stephane, Oh, Kyuseok, Lamperti, Isabella, Berney, Simon, Gandhi, Poshak, Ichikawa, Kohei, Bauer, Franz E., Ho, Luis C., Asmus, Daniel, Beckmann, Volker, Soldi, Simona, Balokovic, Mislav, Gehrels, Neil, Markwardt, Craig B.
Hard X-ray ($\geq 10$ keV) observations of Active Galactic Nuclei (AGN) can shed light on some of the most obscured episodes of accretion onto supermassive black holes. The 70-month Swift/BAT all-sky survey, which probes the 14-195 keV energy range,
Externí odkaz:
http://arxiv.org/abs/1709.03989
Autor:
Koss, Michael J., Glidden, Ana, Balokovic, Mislav, Stern, Daniel, Lamperti, Isabella, Assef, Roberto, Bauer, Franz, Ballantyne, David, Boggs, Steven E., Craig, William W., Farrah, Dancan, Furst, Felix, Gandhi, Poshak, Gehrels, Neil, Hailey, Charles J., Harrison, Fiona A., Markwardt, Craig, Masini, Alberto, Ricci, Claudio, Treister, Ezequiel, Walton, Dominic J., Zhang, William W.
Publikováno v:
The Astrophysical Journal Letters, Volume 824, Issue 1, article id. L4, 7 pp. (2016)
We have discovered heavy obscuration in the dual active galactic nucleus (AGN) in the Swift/Burst Alert Telescope (BAT) source SWIFT J2028.5+2543 using Nuclear Spectroscopic Telescope Array (NuSTAR). While an early XMM-Newton study suggested the emis
Externí odkaz:
http://arxiv.org/abs/1708.06762
Autor:
Koss, Michael, Trakhtenbrot, Benny, Ricci, Claudio, Lamperti, Isabella, Oh, Kyuseok, Berney, Simon, Schawinski, Kevin, Balokovic, Mislav, Baronchelli, Linda, Crenshaw, D. Michael, Fischer, Travis, Gehrels, Neil, Harrison, Fiona, Hashimoto, Yasuhiro, Hogg, Drew, Ichikawa, Kohei, Masetti, Nicola, Mushotzky, Richard, Stern, Daniel, Treister, Ezequiel, Ueda, Yoshihiro, Veilleux, Sylvain, Winter, Lisa
We present the first catalog and data release of the Swift-BAT AGN Spectroscopic Survey (BASS). We analyze optical spectra of the majority of AGN (77%, 641/836) detected based on their 14-195 keV emission in the 70-month Swift BAT all-sky catalog. Th
Externí odkaz:
http://arxiv.org/abs/1707.08123
Autor:
Trakhtenbrot, Benny, Ricci, Claudio, Koss, Michael J., Schawinski, Kevin, Mushotzky, Richard, Ueda, Yoshihiro, Veilleux, Sylvain, Lamperti, Isabella, Oh, Kyuseok, Treister, Ezequiel, Stern, Daniel, Harrison, Fiona, Balokovic, Mislav, Gehrels, Neil
We study the observed relation between accretion rate (in terms of L/L_Edd) and shape of the hard X-ray spectral energy distribution (namely the photon index Gamma_X) for a large sample of 228 hard X-ray selected, low-redshift active galactic nuclei
Externí odkaz:
http://arxiv.org/abs/1705.01550
Autor:
Younes, George, Kouveliotou, Chryssa, Jaodand, Amruta, Baring, Matthew G., van der Horst, Alexander J., Harding, Alice K., Hessels, Jason W. T., Gehrels, Neil, Gill, Ramandeep, Huppenkothen, Daniela, Granot, Jonathan, Göğüş, Ersin, Lin, Lin
We analyzed broad-band X-ray and radio data of the magnetar SGR J1935+2154 taken in the aftermath of its 2014, 2015, and 2016 outbursts. The source soft X-ray spectrum <10 keV is well described with a BB+PL or 2BB model during all three outbursts. Nu
Externí odkaz:
http://arxiv.org/abs/1702.04370
Autor:
Lamperti, Isabella, Koss, Michael, Trakhtenbrot, Benny, Schawinski, Kevin, Ricci, Claudio, Oh, Kyuseok, Landt, Hermine, Riffel, Rogério, Rodríguez-Ardila, Alberto, Gehrels, Neil, Harrison, Fiona, Masetti, Nicola, Mushotzky, Richard, Treister, Ezequiel, Ueda, Yoshihiro, Veilleux, Sylvain
We provide a comprehensive census of the near-Infrared (NIR, 0.8-2.4 $\mu$m) spectroscopic properties of 102 nearby (z < 0.075) active galactic nuclei (AGN), selected in the hard X-ray band (14-195 keV) from the Swift-Burst Alert Telescope (BAT) surv
Externí odkaz:
http://arxiv.org/abs/1701.02755