Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...93...47d&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 93, no. 1, p. 47-63
Astronomy and Astrophysics
Astrophysics
23
Galactic Clusters, Galactic Structure, Morphology, Spatial Distribution, Astronomical Photometry, Density Distribution, Luminosity
Scientific paper
We report the results of a systematic study of galaxies in the regions of Hickson compact groups. Our sample is composed of the 22 Hickson groups which are located in the southern hemisphere and have cz less than 9000 km/s. Making use of digitized images of IIIa-J plates that cover an area of 0.5 x 0.5 deg around each group, we were able to detect and classify images down to a magnitude limit of 19.5 in the B band. This limit is typically three magnitudes fainter than previous studies. Most groups show a statistically significant excess of fainter galaxies compared to the background. These fainter galaxies typically have a somewhat more extended spatial distribution than the brighter galaxies originally classified by Hickson. Our data suggest that Hickson groups have a wide range in density and radius, ranging from very compact structures with overdensities of the order of 102 and crossing times of roughly 0.01 H0-1, to much more diffuse structures, similar to loose groups, with overdensities of about 3 and crossing times of roughly 0.5 H0-1.
de Carvalho Reinaldo R.
Ribeiro André L. B.
Zepf Stephen E.
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