Results 151 to 160 of about 512 (184)

Above the Noise: The Search for Periodicities in the Inner Heliosphere. [PDF]

Sol Phys, 2017
Threlfall J, De Moortel I, Conlon T.
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Dust evolution, a global view: III. Core/mantle grains, organic nano-globules, comets and surface chemistry. [PDF]

R Soc Open Sci, 2016
Jones AP.
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A binary merger product as the direct progenitor of a Type II-P supernova

Niu* Z, Sun* N, Zapartas* E, Souropanis D, Cui Y, Maund JR, Andrews JJ, Briel MM, Fraser M, Gossage S, Kruckow MU, Liotine C, Liu Z, Srivas PM, Teng E, Wang X, Yang Y, Liu J.   +17 more
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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 ...
P. Focardi, B. Kelm, G.G.C. Palumbo
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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 ...
Perez-Beaupuits, J. P., Aalto, S., Spaans, M., Van der Tak, F.   +3 more
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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).
null Chen Jian-sheng, null Zou Zhen-long
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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 ...
W. Neil Johnson, Andrzej A. Zdziarski, Greg M. Madejski, William S. Paciesas, Helmut Steinle, Ying-Chi Lin   +5 more
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Infrared Background from Seyfert Galaxies

Nature, 1970
Kleinmann and Low1 and Low2 have recently reported measurements of the infrared spectrum of the Seyfert galaxy NGC 1068. The spectrum was found to be sharply peaked at a wavelength of ∼100 µm (with an uncertainty of a factor of two or three toward longer wavelengths), while the total infrared luminosity amounts to L∼2.5 × 1046 erg s−1 (for a Hubble ...
G, Setti, L, Woltjer
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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.
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