Zobrazeno 1 - 10
of 139
pro vyhledávání: '"Ptak A"'
Autor:
Yang, J, Wik, DR, Lehmer, BD, West, LA, Williams, BF, Maccarone, TJ, Ptak, A, Yukita, M, Vulic, N, Walton, DJ, Garofali, K, Antoniou, V
Publikováno v:
The Astrophysical Journal. 930:64
We can learn about the formation and evolution of compact objects, such as neutron stars and black holes (BHs), by studying the X-ray emission from accreting systems in nearby star-forming galaxies. The hard (E > 10 keV) X-ray emission in particular
Autor:
Konstantinos Kovlakas, Jeff J. Andrews, Ann Hornschemeier, Andrew Ptak, Andreas Zezas, A. Basu-Zych, Tassos Fragos, Bret D. Lehmer
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 498:4790-4810
Using the Chandra Source Catalog 2.0 and a newly compiled catalogue of galaxies in the local Universe, we deliver a census of ultraluminous X-ray source (ULX) populations in nearby galaxies. We find 629 ULX candidates in 309 galaxies with distance sm
Autor:
Timothy P.L. Roberts, Didier Barret, Natalie A. Webb, A. C. Fabian, Joern Wilms, F. Fürst, Ciro Pinto, D. Stern, Katja Pottschmidt, Peter Kretschmar, Matteo Bachetti, Matthew J. Middleton, Hannah P. Earnshaw, Andy Ptak, M. Heida, Dom Walton, Murray Brightman
Publikováno v:
Astronomy & Astrophysics, 2021, Vol.651, pp.A75 [Peer Reviewed Journal]
Astron.Astrophys.
Astron.Astrophys., 2021, 651, pp.A75. ⟨10.1051/0004-6361/202140625⟩
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2021, 651, pp.A75. ⟨10.1051/0004-6361/202140625⟩
Astron.Astrophys.
Astron.Astrophys., 2021, 651, pp.A75. ⟨10.1051/0004-6361/202140625⟩
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2021, 651, pp.A75. ⟨10.1051/0004-6361/202140625⟩
Ultra-luminous X-ray pulsars (ULXPs) provide a unique opportunity to study super-Eddington accretion. We present the results of a monitoring campaign of ULXP NGC 7793 P13. Over our four-year monitoring campaign with Swift, XMM-Newton, and NuSTAR, we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85f281eebc69f8276fb824ad40403f90
http://dro.dur.ac.uk/34881/1/34881.pdf
http://dro.dur.ac.uk/34881/1/34881.pdf
We select eight nearby AGNs which, based on previous work, appear to be Compton-thin in the line of sight. We model with MYTORUS their broadband X-ray spectra from 20 individual observations with $Suzaku$, accounting self-consistently for Fe K$\alpha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7ef9675d0664190a4f95e3291cc11b5
Autor:
Stefano Marchesi, Stefano Ettori, Richard F. Mushotzky, Nico Cappelluti, Roberto Gilli, Colin Norman, Thomas Dauser, Andrew Ptak, Fabio Vito, Giorgio Lanzuisi, Andrea Comastri
We present a series of new, publicly available mock catalogs of X-ray selected active galactic nuclei (AGNs), non-active galaxies, and clusters of galaxies. They are based on up-to-date observational results on the demographic of extragalactic X-ray
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae1d5ea7e784e8ed9278b5e3f9db01f3
Autor:
Masini, A., Hickox, R. C., Carroll, C. M., Aird, J., Alexander, D. M., Assef, R. J., Bower, R., Brodwin, M., Brown, M. J. I., Chatterjee, S., Chen, C. -T. J., Dey, A., DiPompeo, M. A., Duncan, K. J., Eisenhardt, P. R. M., Forman, W. R., Gonzalez, A. H., Goulding, A. D., Hainline, K. N., Jannuzi, B. T., Jones, C., Kochanek, C. S., Kraft, R., Lee, K. -S., Miller, E. D., Mullaney, J., Myers, A. D., Ptak, A., Stanford, A., Stern, D., Vikhlinin, A., Wake, D. A., Murray, S. S.
We present a new, ambitious survey performed with the Chandra X-ray Observatory of the 9.3 deg$^2$ Bo��tes field of the NOAO Deep Wide-Field Survey. The wide field probes a statistically representative volume of the Universe at high redshift. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a20f645067643fd7274a04671177be2e
Autor:
J. A. Kennea, Benjamin F. Williams, V. Antoniou, Andreas Zezas, M. Yukita, Margaret Lazzarini, Daniel R. Wik, John A. Tomsick, Frank Haberl, Georgios Vasilopoulos, Andy Ptak, Thomas J. Maccarone, Jaesub Hong, Ann Hornschemeier, Bret D. Lehmer, Francesca M. Fornasini, A. Cassity, Andrzej Udalski, Neven Vulic, Arash Bodaghee, Tonia M. Venters
We present a source catalog from the first deep hard X-ray ($E>10$ keV) survey of the Small Magellanic Cloud (SMC), the NuSTAR Legacy Survey of the SMC. We observed three fields, for a total exposure time of 1 Ms, along the bar of this nearby star-fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b6fd1208ebb88e0d9c9b2fef88fc5dd1
http://arxiv.org/abs/1909.11110
http://arxiv.org/abs/1909.11110
Autor:
Jon M. Miller, Marshall W. Bautz, Peter Cheimets, Laura Brenneman, David P. Huenemoerder, Eric J. Miller, Michael A. Nowak, Stephen Walker, Claude R. Canizares, Herman L. Marshall, Lynne A. Valencic, Nancy Brickhouse, Frits Paerels, Paul B. Reid, Joel N. Bregman, Jay Bookbinder, Michael McDonald, David N. Burrows, Abraham D. Falcone, Jonathan F. Schonfeld, Kirpal Nandra, H. Moritz Günther, Simon Dawson, Ralf K. Heilmann, Luigi C. Gallo, Kristin K. Madsen, I. Kreykenbohm, Catherine E. Grant, Karolyn Ronzano, Alan P. Smale, Michael McEachen, Jelle Kaastra, Richard F. Mushotzky, Mark L. Schattenburg, Steve Jara, Andrew Ptak, Joseph Bushman, Pasquale Temi, Scott J. Wolk, Casey T. DeRoo, Margaret H. Abraham, Norbert S. Schulz, Vadim Burwitz, Adam R. Foster, Randall L. McEntaffer, Robert Petre, Elisa Costantini, Jeremy S. Sanders, Deepto Chakrabarty, Katja Poppenhaeger, Richard Willingale, Grace Baird, Butler Hine, Elisabeth Morse, Joern Wilms, Randall K. Smith
Publikováno v:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI.
Arcus provides high-resolution soft X-ray spectroscopy in the 12-50 Å bandpass with unprecedented sensitivity, including spectral resolution < 2500 and effective area < 250 cm^2. The three top science goals for Arcus are (1) to measure the effects o
Current X-ray observations and simulations show that gravitational lensing can be used to infer the structure near the event horizons of black holes, constrain the dynamics and evolution of black-hole accretion and outflows, test general relativity i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b98b712317289a8af6e5a957a8659dff
http://arxiv.org/abs/1904.02018
http://arxiv.org/abs/1904.02018
Autor:
Vulic, Neven, Hornschemeier, A. E., Antoniou, V., Basu-Zych, A. R., Binder, B., Fornasini, F. M., Furst, F., Haberl, F., Heida, M., Lehmer, B. D., Maccarone, T. J., Ptak, A. F., Sivakoff, G. R., Tzanavaris, P., Wik, D. R., Williams, B. F., Wilms, J., Yukita, M., Zezas, A.
What are the most important conditions and processes governing the growth of stellar-origin compact objects? The identification of compact object type as either black hole (BH) or neutron star (NS) is fundamental to understanding their formation and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e52c6459b922526c2904552f6db54f3d