Results 91 to 99 of about 262 (99)

Seyfert Galaxies And Their Environment

Symposium - International Astronomical Union, 1999
The role played by environment on nuclear activity in galaxies is not clear and largely debated (see e.g. Barnes & Hernquist 1992, Kelm 1996). To overcome statistical uncertainties, environment properties of two large samples of Seyfert galaxies (Sy 1 and Sy 2 have been kept separated) have been computed and compared with equivalent size “normal ...
Paola Focardi, B. Kelm, G. G. C. Palumbo
openaire   +2 more sources

HNC and HCN in Seyfert Galaxies

EAS Publications Series, 2008
What are the physical conditions in the nuclear region of Seyfert galaxies? Can we asses the predominant nuclear source of power starburst or AGN by using high density gas tracers? We have used SEST, JCMT, and IRAM 30 m telescopes to observe the J = 1 - 0, J = 3 - 2, and J = 4 - 3 transition lines of HNC and HCN in the Seyfert 2 galaxies NGC 1068 and ...
F. F. S. van der Tak   +3 more
openaire   +3 more sources

The environment of seyfert galaxies

Chinese Astronomy and Astrophysics, 1986
Abstract We made a nearest neighbour analysis on the cluster galaxies in the CfA sample. We found that galaxies with nearest distances below 20 kpc show a clear excess of Seyfert nuclei (i.e., the incidence of Seyferts among such galaxies is about 3 times higher than the average).
Chen Jian-sheng, Zou Zhen-long
openaire   +2 more sources

Seyferts and radio galaxies

AIP Conference Proceedings, 1997
Observations with Compton Gamma Ray Observatory have provided key insights to the high energy emission mechanisms in Active Galactic Nuclei (AGN) and clearly separate them into a class of Blazars, with apparent non-thermal jet emissions often peaking in the EGRET energy band, and into the Seyfert class with emissions more closely related to the ...
Helmut Steinle   +5 more
openaire   +2 more sources

Seyfert Galaxies in the Universe

1986
Recent optical spectroscopy of Seyfert galaxies, particularly at Lick Observatory, is discussed. The frame of reference is the luminosity function of Seyfert galaxies, the incompleteness of available surveys, and how complete samples can be found by combining several different types of surveys.
openaire   +2 more sources

Seyfert Galaxies

Scientific American, 1969
openaire   +1 more source

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