The Spatial Distribution of Seyfert Galaxies
نویسندگان
چکیده
منابع مشابه
The Distribution of Absorbing Column Densities among Seyfert 2 Galaxies
We use hard X-ray data for an " optimal " sample of Seyfert 2 galaxies to derive the distribution of the gaseous absorbing column densities among obscured active nuclei in the local Universe. Of all Seyfert 2 galaxies in the sample, 75% are heavily obscured (N H > 10 23 cm −2) and about half are Compton thick (N H > 10 24 cm −2). Intermediate type 1.8–1.9 Seyferts are characterized by an averag...
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Images at 12.5 lm of nuclei of three nearby Seyfert galaxies—NGC 1275, NGC 4151, and NGC 7469— have been obtained with the 10 m Keck Telescope. NGC 7469 is resolved and deconvolution delineates a structure (<0>04) 0>08, or less than 13 26 pc at a position angle of 135 . From a comparison with structure seen at millimeter wavelengths, this structure is interpreted as a disk aligned with the mole...
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We use the first Millennium Run simulation (MRS) to investigate the spatial locations of the satellites of relatively isolated host galaxies. The stellar masses of the MRS hosts span a range of 10.3 6 log10 [M∗/M⊙] 6 11.5, and host-satellite systems were selected via typical redshift space proximity criteria. The 3-D locations of the MRS satellites are well-fitted by a combination of a Navarro,...
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In this review, rather than present and discuss in detail the first results obtained by BeppoSAX (see Boella et al. 1997 for an overall description of the mission) on Seyfert galaxies (these results are presented in detail elsewhere in this volume, see in particular the contributions by Perola, Comastri and Salvati), I will discuss current ideas on the X–ray emission of both type 1 and 2 object...
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We present optical spectra for new infrared Seyfert galaxies obtained with the 2.16m telescope at Bei-jing Astronomical Observatory (BAO). After wavelength and flux calibration, they are classified by the degree of nuclear activity: nine Seyfert 2 and three Seyfert 3 galaxies. In addition, by using the data from de Grijp et al.(1992), we find that (1) there exists a tight correlation between lu...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1989
ISSN: 0074-1809
DOI: 10.1017/s0074180900140288