The Environment of Sy1, Sy2 & Bright IRAS Galaxies

Details The Environment of Sy1, Sy2 & Bright IRAS Galaxies The Environment of Sy1, Sy2 & Bright IRAS Galaxies

2008-07-16

arxiv.org/abs/0807.2545v1

Memorie della Societa Astronomica Italiana, v.79, p.1185 (2008)

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, uses mem.cls, natbib.sty and aa.bst, The Central Kiloparsec 2008 conference, to be published in the Volume

Scientific paper

We present a 3-dimensional study of the local (< 100 kpc) environment of Sy1, Sy2 and Bright IRAS Galaxies. For this purpose we use three galaxy samples (Sy1, Sy2, BIRG) located at high galactic latitudes as well as three control sample of non-active galaxies having the same morphological, redshift and diameter size distributions as the corresponding Seyfert or BIRG sample. Using the CfA2 and SSRS galaxy catalogues as well as our own spectroscopic observations, we find that the fraction of BIRGs with a close neighbor is significantly higher than that of their control sample. We also find that Sy2 galaxies demonstrate the same behaviour with BIRG galaxies but not with Sy1s which do not show any excess of companions with respect to their control sample galaxies. An additional analysis of the relation between FIR colors and activity type of the BIRG's shows a significant difference between the colors of strongly-interacting and non-interacting starbursts and a resemblance between the colors of non-interacting starbursts and Sy2s.Our results support an evolutionary scenario leading from Starbursting to a Sy2 and finally to an unobscured Sy1 galaxy, where close interactions play the role of the triggering mechanism.

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