Abstract
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] h 100 Mpc. and [20– 90]h 100 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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References
Barnes, J.E. & Hernquist, L. 1992, ARAA., 30, 705
Kelm, B. 1996, Ph.D. Thesis, Universitá degli Studi di Bologna
Veron-Cetty, M.P. & Veron P. 1996, A Catalogue of Quasars and Active Galaxies, ESO Scient. Rep., 17
Huchra, J.P.et al. 1993, ZCAT Catalogue
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© 1999 Springer Science+Business Media Dordrecht
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Focardi, P., Kelm, B., Palumbo, G.G.C. (1999). Seyfert Galaxies And Their Environment. In: Barnes, J.E., Sanders, D.B. (eds) Galaxy Interactions at Low and High Redshift. International Astronomical Union, vol 186. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4665-4_90
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DOI: https://doi.org/10.1007/978-94-011-4665-4_90
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