On the completeness of the lists of compact galaxy groups.

Details On the completeness of the lists of compact galaxy groups. On the completeness of the lists of compact galaxy groups.

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998an....319..369t&link_type=abstract

Astronomische Nachrichten, Vol. 319, No. 6, p. 369 - 373

Astronomy and Astrophysics

Astronomy

2

Galaxy Groups: Compact

Scientific paper

It is shown that the lists of Shakhbazian compact galaxy groups (SCGGs) are not complete. The number of the detected groups in the strip between b = ±30° and b = ±20° is four to five times smaller than expected. The most probable reason is that during the search for SCGGs it was hard to distinguish images of compact galaxies from that of stars on the POSS prints in dense areas of the sky at lower Galactic latitudes. There is some deficit of the detected groups between 60° and 40° of the north Galactic latitudes. The surface density of SCGGs in the southern Galactic hemisphere between b = -50° and b = -30° is about three times less than expected. Obviously, the southern sky has not been searched properly. The list of Hickson's groups is complete down to Galactic latitude ±30°. However, some excess of HCGs is found in the southern hemisphere, where the surface density of the found groups is about two times higher than that in the northern hemisphere.

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