Results 121 to 130 of about 367,227 (284)
Iron line profiles in Suzaku spectra of bare Seyfert galaxies [PDF]
, 2010 We methodically model the broad-band Suzaku spectra of a small sample of six ‘bare’ Seyfert galaxies: Ark 120, Fairall 9, MCG −02-14-009, Mrk 335, NGC 7469 and SWIFT J2127.4+5654.
A. Patrick +5 more
semanticscholar +1 more source
A New Sample of Gamma-Ray Emitting Jetted Active Galactic Nuclei
Universe, 2022 We considered the fourth catalog of gamma-ray point sources produced by the Fermi Large Area Telescope (LAT) and selected only jetted active galactic nuclei (AGN) or sources with no specific classification, but with a low-frequency counterpart. Our final
Luigi Foschini +13 more
doaj +1 more source
The Astrophysical Journal, 2001 It is known that the spectral energy distribution (SED) of the nuclear radiation of narrow-line Seyfert 1 galaxies (NLS1s) has different shapes with respect to that of ordinary broad-line Seyfert 1 galaxies (BLS1s), particularly in wavelengths of X-ray.
Yoshiaki Taniguchi +2 more
openaire +3 more sources
Seyfert 2 Galaxies with Spectropolarimetric Observations [PDF]
Symposium - International Astronomical Union, 2002 We compare Seyfert 2 galaxies(Sy2s) with detected polarized broad emission lines(PBL) with Sy2s without detected PBL and find that the majority of Sy2s without PBL are those sources with less powerful AGN activity, most likely caused by low accretion rates.
Qiusheng Gu, Jie-Hao Huang
openaire +5 more sources
X-ray spectral properties of Seyfert galaxies and the unification scheme [PDF]
, 2010 Aims: The unification scheme of Seyfert galaxies predicts that the observed differences between type 1 and type 2 Seyfert galaxies are solely due to the differing orientations of the toroidal-shaped obscuring material around AGN.
Veeresh Singh +12 more
semanticscholar +1 more source
Testing the Unified Model with an Infrared Selected Sample of Seyfert Galaxies [PDF]
, 2001 We present a series of statistical tests done to a sample of 29 Seyfert 1 and 59 Seyfert 2 galaxies selected from mostly isotropic properties, their far infrared fluxes and warm infrared colors. Such selection criteria provide a profound advantage over the criteria used by most investigators in the past, such as ultraviolet excess.
arxiv +1 more source
EPJ Web of Conferences, 2013 Galaxy NGC 1275 is the central dominant galaxy of the Perseus Cluster of Galaxies and is of Seyfert galaxy class. NGC 1275 is known as powerful X-ray and radio source.
Sinitsyna V.Y., Sinitsyna V.G.
doaj +1 more source
Optical multiband surface photometry of a sample of Seyfert galaxies - I. Large-scale morphology and local environment analysis of matched Seyfert and inactive galaxy samples [PDF]
, 2010 Context. Parallel analysis of the large-scale morphology and local environment of matched active and control galaxy samples plays an important role in studies of the fueling of active galactic nuclei. Aims.
L. Slavcheva-Mihova, B. Mihov
semanticscholar +1 more source
Extragalactic X-ray discrete sources
Вісник Астрономічної школи, 2020 Extra-galactic X-ray research with the launch of XMM-Newton has become the forefront of X-ray astronomy. X-ray sources outside our galaxy are the other galaxies – normal galaxies, radio galaxies, quasars, blazars, Seyfert galaxies, as well as extended ...
L. V. Zadorozhna +2 more
doaj +1 more source
A Panchromatic View of Relativistic Jets in Narrow-Line Seyfert 1 Galaxies
Galaxies, 2016 The discovery by the Large Area Telescope on board Fermi of variable γ-ray emission from radio-loud narrow-line Seyfert 1 (NLSy1) galaxies revealed the presence of a possible third class of Active Galactic Nuclei (AGN) with relativistic jets in addition ...
Filippo D’Ammando +5 more
doaj +1 more source