Mathematics – Logic
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ans...324...91c&link_type=abstract
Astronomische Nachrichten, Supplementary Issue 2, Vol. 324, Short Contributions of the Annual Scientific Meeting of the Astronom
Mathematics
Logic
Scientific paper
Close pairs and/or multiple systems of galaxies have been selected from the Innsbruck database of ZoA galaxies and observed by means of optical photometry in the framework of a project devoted to evaluate the total foreground Galactic extinction at low galactic latitudes. A spectroscopic follow-up of these selected systems, whose properties are still widely unknown, allowed to identify those physically bound. We have discovered in this way a new group of galaxies, CG J0247+44.9 (l=143circ.64, b=-13circ.29), which satisfies the Hickson's criteria for Compact Groups (CGs). Our group consists of six members out of which a close interacting pair, IRAS 02443+4437,comprised of an early-type galaxy and a starbursting spiral both showing strong morphological distortions. Among the other members we have identified another early-type galaxy and three spirals whose emission-line spectra are typical of a Seyfert 2, a LINER and a weak HII galaxy, respectively. None of these four additional members show clear morphological signs of recent interaction. The group is located at a median distance of 156.4 Mpc (H0 = 75 km s-1 Mpc-1), and the centers of its members are contained into a circle of radius 120 kpc. The relatively high velocity dispersion of the group, σ = 458 km s-1, combined with the low fraction of gas-rich members and the low estimated crossing time (H0tc = 0.016) would suggest that the group is dynamically old.(Based on data obtained at Calar Alto (Spain) and Asiago (Italy) Observatories.)
Ciroi Stefano
Temporin Sonia
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