normal galaxy
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2017 ◽  
Vol 605 ◽  
pp. A42 ◽  
Author(s):  
S. Carniani ◽  
R. Maiolino ◽  
A. Pallottini ◽  
L. Vallini ◽  
L. Pentericci ◽  
...  
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2017 ◽  
Vol 838 (2) ◽  
pp. 137 ◽  
Author(s):  
Alexandra Pope ◽  
Alfredo Montaña ◽  
Andrew Battisti ◽  
Marceau Limousin ◽  
Danilo Marchesini ◽  
...  

2016 ◽  
Vol 825 (1) ◽  
pp. 7 ◽  
Author(s):  
B. D. Lehmer ◽  
A. R. Basu-Zych ◽  
S. Mineo ◽  
W. N. Brandt ◽  
R. T. Eufrasio ◽  
...  
Keyword(s):  
X Ray ◽  

Nature ◽  
2015 ◽  
Vol 519 (7543) ◽  
pp. 327-330 ◽  
Author(s):  
Darach Watson ◽  
Lise Christensen ◽  
Kirsten Kraiberg Knudsen ◽  
Johan Richard ◽  
Anna Gallazzi ◽  
...  
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2013 ◽  
Vol 766 (1) ◽  
pp. 19 ◽  
Author(s):  
M. Tremmel ◽  
T. Fragos ◽  
B. D. Lehmer ◽  
P. Tzanavaris ◽  
K. Belczynski ◽  
...  

2010 ◽  
Author(s):  
Bret D. Lehmer ◽  
A. Comastri ◽  
L. Angelini ◽  
M. Cappi ◽  

2008 ◽  
Vol 8 (4) ◽  
pp. 369-384 ◽  
Author(s):  
C. Ke-shih Young ◽  
Malcolm J Currie ◽  
Robert J Dickens ◽  
A-Li Luo ◽  
Tong-Jie Zhang

2006 ◽  
Vol 131 (2) ◽  
pp. 790-805 ◽  
Author(s):  
Honglin Lu ◽  
Hongyan Zhou ◽  
Junxian Wang ◽  
Tinggui Wang ◽  
Xiaobo Dong ◽  
...  

1999 ◽  
Vol 186 ◽  
pp. 355-355
Author(s):  
P. Focardi ◽  
B. Kelm ◽  
G.G.C. Palumbo

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 galaxy” sample ones. Seyfert samples have been extracted from the Veron & Veron catalogue (Veron & Veron 1996), whilst “normal galaxies” have been randomly extracted from ZCAT (Huchra 1993). The samples are limited in cz ([1500–9500] km/sec) and contain 149 Sy 1, 173 Sy 2 and 160 “normal galaxies” (hundreds of random extractions from ZCAT). For each galaxy neighbors have been computed (from ZCAT) within two variables radii, R (isolation radius) and r (pair separation), which span [0.2 - 2] h100 Mpc. and [20–90]h100 kpc. respectively. Neighbors must lie also within 700 km/sec from the galaxy. In this way, for each value of R and r, environment of each galaxy has been “quantified”.


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