Results 151 to 160 of about 367,227 (284)
Soft gamma rays from low accreting supermassive black holes and connection to energetic neutrinos. [PDF]
Nat Commun, 2021 Kimura SS, Murase K, Mészáros P.
europepmc +1 more source
Reverberation mapping of active galactic nuclei: from X-ray corona to dusty torus. [PDF]
iScience, 2021 Cackett EM, Bentz MC, Kara E.
europepmc +1 more source
The Disk Wind Contribution to the Gamma-Ray Emission from the Nearby Seyfert Galaxy GRS 1734−292
The Astrophysical JournalRadio-quiet Seyfert galaxies have been detected in GeV gamma rays by the Fermi Large Area Telescope (LAT), but the origin of much of this emission is unclear.
Nobuyuki Sakai +6 more
doaj +1 more source
The Astronomical Journal, 1982 As part of an ongoing program of measuring galaxy redshifts at Mount Hopkins observatory, we have discovered several previously unknown bright Seyfert galaxies. Most of the objects are of Seyfert type 2, but several are type 1 objects where the broad permitted line region is easily visible only for the H..cap alpha.. line.
M. Davis, W. F. Wyatt, J. P. Huchra
openaire +2 more sources
The extent of ionization in simulations of radio-loud AGNs impacting kpc gas discs. [PDF]
Mon Not R Astron Soc, 2022 Meenakshi M +6 more
europepmc +1 more source
The radio properties of bright Seyfert galaxies
The Astrophysical Journal Supplement Series, 1990 The radio properties of a sample of 69 bright spectroscopically selected Seyfert galaxies, which suffers from little bias toward Markarian galaxies with strong UV excess. At variance with most of the earlier results, generally based on galaxy samples which are strongly biased toward the inclusion of Markarian objects, there is no clear evidence of a ...
GIURICIN G +3 more
openaire +3 more sources
Optical polarization of Seyfert galaxies
The Astrophysical Journal, 1988 Des mesures de la polarisation du continuum optique d'un echantillon de 19 galaxies de Seyfert ont ete effectuees. Elles sont accompagnees pour 9 d'entre-elles d'observations polarimetriques de la raie d'emission Hα.
Ian B. Thompson, Peter G. Martin
openaire +2 more sources
Optical Emission Lines and the X-Ray Properties of Type 1 Seyfert Galaxies
Open Astronomy, 2011 In this contribution we report on the study of the optical emission lines and X-ray spectra of a sample of Type 1 AGNs, collected from the SDSS database and observed by the XMM-Newton satellite.
La Mura G. +5 more
doaj +1 more source
Detection of X-Rays from the Seyfert Galaxies NGC 1275 and NGC 4151 by the UHURU Satellite
, 1971 Seyfert galaxies NGC 1275 and NGC 4151 X ray flux detection, determining position and emission ...
H. Gursky +4 more
semanticscholar +1 more source
INTEGRAL and the Unified Model of AGN [PDF]
arXiv, 2011 According to the unified model, the differences observed in different classes of AGN are due to anisotropic obscuration. This implies that in the hard X-rays, at energies where the radiation can pierce the obscuring material, the average spectral characteristics of different classes of AGN should be the same.
arxiv