New Spectral Model for Constraining Torus Covering Factors from Broadband X-Ray Spectra of Active Galactic Nuclei [PDF]
, 2018 The basic unified model of active galactic nuclei (AGNs) invokes an anisotropic obscuring structure, usually referred to as a torus, to explain AGN obscuration as an angle-dependent effect.
M. Baloković +12 more
semanticscholar +1 more source
X-ray emission of z > 2.5 active galactic nuclei can be obscured by their host galaxies [PDF]
Astronomy & Astrophysics, 2019 We present a multiwavelength study of seven active galactic nuclei (AGN) at spectroscopic redshift >2.5 in the 7 Ms Chandra Deep Field South that were selected for their good far-infrared (FIR) and submillimeter (submm) detections.
C. Circosta +8 more
semanticscholar +1 more source
X-ray variability time scales in active galactic nuclei [PDF]
Astronomy & Astrophysics, 2009 6 pages, 1 figure, accepted for publication in Astronomy and ...
Ishibashi, W., Courvoisier, T. J. -L.
openaire +2 more sources
The Astrophysical Journal, 2023 1ES1927+654 is a nearby active galactic nucleus (AGN) that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability patterns at timescales of months to years.
Ritesh Ghosh +26 more
doaj +1 more source
X-ray power law spectra in active galactic nuclei [PDF]
, 2010 X-ray spectra of active galactic nuclei (AGN) are usually described as power law spectra, characterized by the spectral slope $\alpha$ or photon index $\Gamma$. Here we discuss the X-ray spectral properties within the framework of clumpy accretion flows,
Courvoisier +27 more
core +1 more source
TOWARD THE STANDARD POPULATION SYNTHESIS MODEL OF THE X-RAY BACKGROUND: EVOLUTION OF X-RAY LUMINOSITY AND ABSORPTION FUNCTIONS OF ACTIVE GALACTIC NUCLEI INCLUDING COMPTON-THICK POPULATIONS [PDF]
, 2014 We present the most up to date X-ray luminosity function (XLF) and absorption function of active galactic nuclei (AGNs) over the redshift range from 0 to 5, utilizing the largest, highly complete sample ever available obtained from surveys performed with
Y. Ueda +4 more
semanticscholar +1 more source
X-RAY LUMINOSITY FUNCTIONS OF ACTIVE GALACTIC NUCLEI [PDF]
Multiwavelength AGN Surveys, 2004 To appear in the proceedings of the conference "Multiwavelenth AGN Surveys", held in Cozumel, Mexico, December 2003 (invited talk).
openaire +2 more sources
X-ray absorption and reflection in active galactic nuclei [PDF]
The Astronomy and Astrophysics Review, 2009 Accepted for publication in the Astronomy and Astrophysics Review. 58 pages, 9 figures.
Turner, T, Miller, L
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Search for X-ray occultations in active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 Accepted for publication in MNRAS. 15 pages, 7 figures. Table 2 not included, will be available in the published version.
G. Torricelli Ciamponi +3 more
openaire +2 more sources
SDSS-IV eBOSS Spectroscopy of X-Ray and WISE AGNs in Stripe 82X: Overview of the Demographics of X-Ray- and Mid-infrared-selected Active Galactic Nuclei [PDF]
Astrophysical Journal, 2019 We report the results of a Sloan Digital Sky Survey IV eBOSS program to target X-ray sources and mid-infrared-selected Wide-field Infrared Survey Explorer (WISE) active galactic nucleus (AGN) candidates in a 36.8 deg2 region of Stripe 82. About half this
S. LaMassa +8 more
semanticscholar +1 more source