The Chandra Deep Fields: Lifting the Veil on Distant Active Galactic Nuclei and X-Ray Emitting Galaxies [PDF]
, 2017 The Chandra Deep Fields (CDFs), being a major thrust among extragalactic X-ray surveys and complemented effectively by multiwavelength observations, have critically contributed to our dramatically improved characterization of the 0.5-8 keV cosmic X-ray ...
Yongquan Xue
semanticscholar +1 more source
BASS. XXII. The BASS DR2 AGN Catalog and Data
The Astrophysical Journal Supplement Series, 2022 We present the active galactic nucleus (AGN) catalog and optical spectroscopy for the second data release of the Swift BAT AGN Spectroscopic Survey (BASS DR2).
Michael J. Koss +34 more
doaj +1 more source
An X-ray spectral study of 24 type 1 active galactic nuclei [PDF]
, 1996 I present a study of the X-ray spectral properties of a sample containing 24 type-1 active galactic nuclei using the medium spectral resolution of ``ASCA''. The sample consists of 20 radio-quiet objects and 4 radio-loud objects.
C. Reynolds
semanticscholar +1 more source
The subarcsecond mid-infrared view of local active galactic nuclei – II. The mid-infrared–X-ray correlation [PDF]
, 2015 We present an updated mid-infrared (MIR) versus X-ray correlation for the local active galactic nuclei (AGN) population based on the high angular resolution 12 and 18?m continuum fluxes from the AGN subarcsecond MIR atlas and 2–10 keV and 14–195 keV data
D. Asmus +11 more
semanticscholar +1 more source
Hard X-ray variability of active galactic nuclei [PDF]
Astronomy & Astrophysics, 2007 Aims. Active Galactic Nuclei are known to be variable throughout the electromagnetic spectrum. An energy domain poorly studied in this respect is the hard X-ray range above 20 keV. Methods. The first 9 months of the Swift/BAT all-sky survey are used to study the 14-195 keV variability of the 44 brightest AGN. The sources have been selected due to their
V. Beckmann +6 more
openaire +1 more source
Cosmic X-ray Background from Early Active Galactic Nuclei [PDF]
International Astronomical Union Colloquium, 1989 A model for the origin of the cosmic X-ray background (hereafter XRB) is presented. The component of the background left after subtraction of the known classes of sources is explained by emission from a population of black hole sources at the redshift of z ~ 4-5. The model is presented in more detail elsewhere (Zdziarski 1988).
openaire +2 more sources
Identification of four RXTE Slew Survey sources with nearby luminous active galactic nuclei [PDF]
, 2005 Based on RXTE scans and observations with the SWIFT/XRT telescope and INTEGRAL observatory, we report the identification of four X-ray sources discovered during the RXTE Slew Survey of the |b|>10deg sky with nearby (z ~ 0.017-0.098) luminous (log L_2 ...
Dickey +10 more
core +1 more source
A UV to X-Ray View of Soft Excess in Type 1 Active Galactic Nuclei. II. Broadband Correlations
The Astrophysical JournalThe physical origin of soft X-ray excess (SE) is a long-lasting question, with two prevailing theories—“warm corona” and “ionized reflection”—dominating the discussion.
Shi-Jiang Chen +7 more
doaj +1 more source
The anti-correlation between the hard X-ray photon index and the Eddington ratio in LLAGNs
, 2009 We find a significant anti-correlation between the hard X-ray photon index and the Eddington ratio L_Bol/L_Edd for a sample of Low-Ionization Nuclear Emission-line Regions (LINERs) and local Seyfert galaxies, compiled from literatures with Chandra or XMM-
Bian +65 more
core +2 more sources
Several New Active Galactic Nuclei Among X-ray Sources Detected by INTEGRAL and SWIFT Observatories [PDF]
, 2008 We present the results of the optical identifications of a set of X-ray sources from the all-sky surveys of INTEGRAL and SWIFT observatories. Optical data were obtained with Russian-Turkish 1.5-m Telescope (RTT150).
A. V. Mescheryakov +22 more
core +2 more sources