Results 111 to 120 of about 367,227 (284)
The Seyfert Population in the Local Universe [PDF]
Astron.J.126:1750,2003, 2003 The magnitude-limited catalog of the Southern Sky Redshift Survey (SSRS2), is used to characterize the properties of galaxies hosting Active Galactic Nuclei. Using emission-line ratios, we identify a total of 162 (3%) Seyfert galaxies out of the parent sample with 5399 galaxies. The sample contains 121 Seyfert 2 galaxies and 41 Seyfert 1.
arxiv +1 more source
Spatially resolved BPT mapping of nearby Seyfert 2 galaxies [PDF]
, 2020 We present spatially resolved BPT mapping of the extended narrow line regions (ENLRs) of seven nearby Seyfert 2 galaxies, using HST narrow band filter imaging. We construct the BPT diagrams using $\leq$ 0.1" resolution emission line images of [O III]$\lambda$5007, H$\alpha$, [S II]$\lambda$$\lambda$6717,6731, and H$\beta$.
arxiv +1 more source
On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies ! [PDF]
, 2006 We investigate the relation between X-ray nuclear emission, optical emission line luminosities and black hole masses for a sample of 47 Seyfert galaxies. The sample, which has been selected from the Palomar optical spectroscopic survey of nearby galaxies
F. Panessa +7 more
semanticscholar +1 more source
The Astrophysical Journal Supplement Series, 2023 We analyze a sample of 21 “bare” Seyfert 1 active galactic nuclei, a subclass of Seyfert 1 galaxies, with intrinsic absorption N _H ∼ 10 ^20 cm ^−2 , in the local Universe ( z < 0.2) using XMM-Newton and Swift/XRT observations.
Prantik Nandi +7 more
doaj +1 more source
Hidden starbursts in Seyfert 1 galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 5 pages, 1 figure.
S. Viegas, A. Rodriguez-Ardila
openaire +4 more sources
INFRARED SPECTRAL ENERGY DISTRIBUTIONS OF SEYFERT GALAXIES: SPITZER SPACE TELESCOPE OBSERVATIONS OF THE 12 μm SAMPLE OF ACTIVE GALAXIES [PDF]
, 2010 The mid-infrared spectral energy distributions (SEDs) of 83 active galaxies, mostly Seyfert galaxies, selected from the extended 12 μm sample are presented.
J. Gallimore +14 more
semanticscholar +1 more source
The Close Environment of Seyfert Galaxies and Its Implication for Unification Models [PDF]
, 1999 This paper presents a statistical analysis of the circumgalactic environment of nearby Seyfert galaxies based on a computer-aided search of companion galaxies on the Digitized Sky Survey (DSS). An intrinsic difference between the environment of Seyfert 1 and Seyfert 2 galaxies, suggested by previous work, is confirmed as statistically significant.
arxiv +1 more source
Gas Motion Mapping for Three Seyfert Galaxies
Open Astronomy, 2011 We report the preliminary results of a kinematical study of three Seyfert galaxies selected from a sample of nearby active galactic nuclei observed using 3D spectroscopy.
Smirnova A. +3 more
doaj +1 more source
On X‐Ray Variability in Seyfert Galaxies [PDF]
The Astrophysical Journal, 1999 11 pages, 1 figure 1 table. LaTeX with encapsulated postscript. Accepted for publication in the Astrophysical Journal. Replaced first version to fix a printing problem caused by the figure.
Ian M. George +6 more
openaire +3 more sources
Reverberation mapping of the emission line regions of Seyfert galaxies and quasars.
, 1982 Variations in the strengths of the central photoionization source in a quasar or Seyfert galaxy will generate variations in the strengths and profiles of the emission lines.
R. Blandford, C. McKee
semanticscholar +1 more source