Results 1 to 10 of about 329,488 (298)

A Markedly Expanded Sample of Candidate X-Ray-emitting Isolated Neutron Stars

The Astrophysical Journal
The current sample of 12 radio-quiet isolated neutron stars that emit strongly in X-rays (XINSs) is both small and heterogeneous, limiting its usefulness for understanding the physics of neutron star atmospheres and cooling rates and for constraining the
Sebastian Demasi, Scott F. Anderson, Marcel A. Agüeros   +2 more
doaj   +1 more source

Measuring the Cosmic X-Ray Background in 3–20 KeV with Stray Light from NuSTAR

The Astronomical Journal, 2023
By characterizing the contribution of stray light to large data sets from the CXB Measurement X-ray observatory collected over 2012–2017, we report a measurement of the cosmic X-ray background (CXB) in the 3–20 keV energy range. These data represent ∼20%
Steven Rossland, Daniel R. Wik, Brian Grefenstette, Nico Cappelluti, Francesca Civano, Fabio Gastaldello, Roberto Gilli, Fiona Harrison, Ann Hornschemeier, Ryan Hickox, Roman Krivonos, Kristin Madsen, Silvano Molendi, Andrew Ptak, Daniel Stern, Andreas Zoglauer   +15 more
doaj   +1 more source

Infrared and hard X-ray diagnostics of AGN identification from the Swift/BAT and AKARI all-sky surveys

, 2012
We combine data from two all-sky surveys in order to study the connection between the infrared and hard X-ray (>10keV) properties for local active galactic nuclei (AGN).
Dotani, Tadayasu, Gandhi, Poshak, Ichikawa, Kohei, Isobe, Naoki, Matsuta, Keiko, Nakagawa, Takao, Oyabu, Shinki, Stawarz, Łukasz, Terashima, Yuichi, Ueda, Yoshihiro, Yamamura, Issei   +10 more
core   +1 more source

Surveys of X-Ray Sources [PDF]

Highlights of Astronomy, 1968
My assignment this afternoon is to review briefly the status of the observational work that has been accomplished since the last IAU discussion of X-ray astronomy which took place at the Liege Symposium 3 years ago. Essentially, the methods of observation have not changed in any significant way.
openaire   +1 more source

Chandra X-Ray Observatory Observations of 13 Fermi LAT Sources

The Astrophysical Journal
In the latest data release from the Fermi Gamma-ray Space Telescope (the 4th Fermi LAT 14 yr Catalog, or 4FGL), more than 50% of the Galactic sources are yet to be identified.
Blagoy Rangelov, Hui Yang, Brice Williams, Oleg Kargaltsev, Jeremy Hare, Kean Martinic   +5 more
doaj   +1 more source

A new X-ray mission to measure the power spectrum of fluctuations in the Universe [PDF]

, 1997
We propose a new, simple, dedicated X-ray mission to measure the power spectrum of density fluctuations in the Universe, by accurately mapping the X-ray background on the whole sky on scales of arounf one sq deg.
Barcons, Boldt, Boyle, Cagnoni, Friedrich, Gendreau, Georgantopoulos, Hasinger, Madau, McHardy, Peacock, Piccinotti, Schmidt   +12 more
core   +2 more sources

On the Cosmic Evolution of AGN Obscuration and the X-Ray Luminosity Function: XMM-Newton and Chandra Spectral Analysis of the 31.3 deg2 Stripe 82X

The Astrophysical Journal, 2023
We present X-ray spectral analysis of XMM-Newton and Chandra observations in the 31.3 deg ^2 Stripe-82X (S82X) field. Of the 6181 unique X-ray sources in this field, we analyze a sample of 2937 candidate active galactic nuclei (AGNs) with solid redshifts
Alessandro Peca, Nico Cappelluti, C. Megan Urry, Stephanie LaMassa, Stefano Marchesi, Tonima Tasnim Ananna, Mislav Baloković, David Sanders, Connor Auge, Ezequiel Treister, Meredith Powell, Tracey Jane Turner, Allison Kirkpatrick, Chuan Tian   +13 more
doaj   +1 more source

The 157 Month Swift/BAT All-sky Hard X-Ray Survey

The Astrophysical Journal
The Burst Alert Telescope (BAT) on board the Neil Gehrels Swift Observatory has been serving as a survey instrument for the hard X-ray sky, and has detected thousands of X-ray sources (e.g., active galactic nuclei, X-ray binaries, etc).
Amy Y. Lien, Hans A. Krimm, Craig B. Markwardt, Kyuseok Oh, Lea Marcotulli, Richard Mushotzky, Nicholas R. Collins, Scott D. Barthelmy, Wayne H. Baumgartner, S. Bradley Cenko, Michael Koss, Sibasish Laha, Takanori Sakamoto, David M. Palmer, Tyler Parsotan   +14 more
doaj   +1 more source

Coronal X-Ray Emission from Nearby, Low-mass, Exoplanet Host Stars Observed by the MUSCLES and Mega-MUSCLES HST Treasury Survey Projects

The Astronomical Journal, 2023
The high-energy X-ray and ultraviolet (UV) radiation fields of exoplanet host stars play a crucial role in controlling the atmospheric conditions and the potential habitability of exoplanets.
Alexander Brown, P. Christian Schneider, Kevin France, Cynthia S. Froning, Allison A. Youngblood, David J. Wilson, R. O. Parke Loyd, J. Sebastian Pineda, Girish M. Duvvuri, Adam F. Kowalski, Zachory K. Berta-Thompson   +10 more
doaj   +1 more source

AGN evolution from large and deep X-ray surveys

, 2010
Over the last few years, the existence of mutual feedback effects between accreting supermassive black holes powering AGN and star formation in their host galaxies has become evident.
Best, Brusa, Brusa, Ebrero, Fiore, Gilli, Grazian, Hasinger, Maiolino, Marcella Brusa   +9 more
core   +1 more source