Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ans...324r..94s&link_type=abstract
Astronomische Nachrichten, Supplementary Issue 2, Vol. 324, Short Contributions of the Annual Scientific Meeting of the Astronom
Astronomy and Astrophysics
Astronomy
Scientific paper
Compact groups of galaxies (CGs) are ideal objects to observe galaxy interactions and with it galaxy formation and evolution, e.g. the merging into bright field ellipticals. We have found two possible CG candidates one of which lies in the Zone of Avoidance. For this newly-detected ultra-dense CG candidate we present BVRI photometry. CCD images have been obtained using the 2.5 m Nordic Optical Telescope (NOT) in September 2000. The images reveal five possible group members, configured in a chain-like structure. A B-V color map has been built which shows a color gradient across them. No information on redshift is available until present, but judging from the angular size of the galaxy candidates we estimate that a radial velocity of 15,000 to 20,000 km s-1 might be a reasonable assumption. This would lead to a median projected separation of only 8 to 11 kpc making this object one of the densest CGs known (H0 = 75 km s-1 Mpc-1). The second candidate, MCG+01-19-001 is classified as S/I galaxy but the images we obtained with the Asiago Faint Object Spectrograph and Camera (AFOSC) at the 1.82 m Copernico telescope show several adjacent clumps which could be possible companion galaxies. Radial velocities of these objects have been measured at low resolution long-slit spectra. The highest velocity difference relative to the galaxy nucleus, 500 km s-1, has been found for the region located between the nucleus itself and one of the clumps. However, the high velocity error and the poor spectral resolution do not yet allow any conclusions about the nature of the clumps.
Scholz Christoph K.
Temporin Sonia
Weinberger Ram
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