Results 11 to 20 of about 67,039 (310)
Surveys of the Cosmic X-ray Background
, 2021 We provide a highly concise overview of what X-ray surveys and their multiwavelength follow-up have revealed about the nature of the cosmic X-ray background (CXRB) and its constituent sources.
Brandt, W. N., Yang, G.
core +2 more sources
, 1970 Chapters 1 to 3 are devoted solely to review of the X-ray sky, the environmental limitations on an experiment, and the techniques of X-ray detection. These are necessary for the design of proportional counters for a series of rocket surveys of the X-ray ...
Francey, R J (15931268)
core +2 more sources
The high energy X-ray probe (HEX-P): bringing the cosmic X-ray background into focus
Frontiers in Astronomy and Space SciencesSince the discovery of the cosmic X-ray background (CXB), astronomers have strived to understand the accreting supermassive black holes (SMBHs) contributing to its peak in the 10–40 keV band.
F. Civano +40 more
doaj +2 more sources
Astronomische Nachrichten, 2003 AbstractWe review highlights of the results obtained from recent Galactic X‐ray survey observations, in particular ASCA Galactic center and plane surveys and our Chandra deep survey on the (l, b) ≈ (28°.5, 0°.0) region. Strong hard X‐ray diffuse components are observed from Galactic ridge, center and bulge, and they have both thermal and non‐thermal ...
Ebisawa, K. +4 more
openaire +2 more sources
BAT X‐Ray Survey. I. Methodology and X‐Ray Identification [PDF]
The Astrophysical Journal, 2008 35 pages, 10 figures, Accepted for publication in ApJ.
Ajello, M. +5 more
openaire +4 more sources
Survey of X-ray pulsars in hard X-rays [PDF]
Proceedings of The Extreme sky: Sampling the Universe above 10 keV — PoS(extremesky2009), 2010 Results of spectral, timing and spatial analysis of X-ray pulsars in hard X-rays are briefly discussed. Using data of INTEGRAL, XMM-Newton and Chandra observatories we determined an optical counterparts and distances for several X-ray pulsars and built the spatial distribution of this class objects in the Galaxy. Variations of the cyclotron line energy
Alexander Lutovinov, Sergey Tsygankov
openaire +1 more source
An X‐Ray Survey of Galaxies in Pairs [PDF]
The Astrophysical Journal, 1999 Results are reported from the first survey of X-ray emission from galaxies in pairs. The sample consists of fifty-two pairs of galaxies from the Catalog of Paired Galaxies Karachentsev (1972) whose coordinates overlap ROSAT Position Sensitive Proportional Counter pointed observations.
Henriksen, M., Cousineau, S.
openaire +2 more sources
The Soft X-ray Excess in Quasars and Deep X-ray Surveys [PDF]
Symposium - International Astronomical Union, 1994 We examine the surface density of quasars expected in the ROSAT PSPC surveys, using quasar optical luminosity functions and model continuum spectra including a soft X-ray excess. We show that the surface density is a sensitive function of the characteristic energy of the soft excess, and the absorption within the quasar as well as the interstellar ...
Ajit Kembhavi, A. C. Fabian
openaire +1 more source
Next Generation X-ray Imaging Surveys
, 2022 The launch of Chandra more than twenty years ago marked a turning point in our understanding of the deep X-ray Universe. The 0.1 deg2 Chandra Deep Field South (CDFS), the 2 deg2 Chandra-COSMOS Legacy, and the other Chandra deep fields have probed the ...
Comastri, A. +17 more
core +2 more sources
BASS. XXI. The Data Release 2 Overview
The Astrophysical Journal Supplement Series, 2022 The BAT AGN Spectroscopic Survey (BASS) is designed to provide a highly complete census of the key physical parameters of the supermassive black holes (SMBHs) that power local active galactic nuclei (AGNs) ( z ≲ 0.3), including their bolometric ...
Michael J. Koss +26 more
doaj +1 more source