Results 21 to 30 of about 50,755 (263)
What obscures low-X-ray-scattering active galactic nuclei?★ [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 10 pages, 5 figures, 2 tables; accepted for publication in ...
Hönig, Sebastian Florian +6 more
openaire +3 more sources
Sources of X-rays from galaxies [PDF]
, 2011 Galactic X-ray emission is a manifestation of various high-energy phenomena and processes. The brightest X-ray sources are typically accretion-powered objects: active galactic nuclei and low- or high-mass X-ray binaries.
Liu +10 more
core +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
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
openaire +3 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
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
Heavy X‐Ray Absorption in Soft X‐Ray–weak Active Galactic Nuclei [PDF]
The Astrophysical Journal, 2001 30 pages, 10 figures, LaTeX, uses aaspp4.sty; submitted to ...
Gallagher, S. C. +6 more
openaire +2 more sources
OCCUPATION OF X-RAY-SELECTED GALAXY GROUPS BY X-RAY ACTIVE GALACTIC NUCLEI [PDF]
The Astrophysical Journal, 2012 We present the first direct measurement of the mean halo occupation distribution (HOD) of X-ray-selected active galactic nuclei (AGNs) in the COSMOS field at z ≤ 1, based on the association of 41 XMM and 17 C-COSMOS AGNs with member galaxies of 189 X-ray-detected galaxy groups from XMM-Newton and Chandra data.
Allevato, V. +14 more
openaire +8 more sources
X-ray absorption in INTEGRAL active galactic nuclei [PDF]
Astronomy & Astrophysics, 2020 In this work the INTEGRAL hard X-ray selected sample of active galactic nuclei (AGN) has been used to investigate the possible contribution of absorbing material distributed within the host galaxies to the total amount of NH measured in the X-ray band. We collected all the available axial ratio measurements of the galaxies hosting our AGN together with
A. Malizia +4 more
openaire +1 more source