Groups of galaxies within 80 Mpc. I - Grouping hierarchical method and statistical properties

Details Groups of galaxies within 80 Mpc. I - Grouping hierarchical method and statistical properties Groups of galaxies within 80 Mpc. I - Grouping hierarchical method and statistical properties

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255...69g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 69-86.

Astronomy and Astrophysics

Astronomy

66

Galactic Clusters, Galactic Mass, Mass To Light Ratios, Sky Surveys (Astronomy), Stellar Luminosity, Algorithms, Red Shift, Velocity Distribution, Virial Theorem

Scientific paper

An all-sky sample of 4143 galaxies comprising all the objects with an apparent diameter D(25) larger than 100 arcsec and with recession velocities smaller than 6000 km/s (i.e., closer than 80 Mpc) was analyzed using a hierarchical algorithm similar to Tully's (1987) algorithm, in order to classify the galaxies into groups defined as entities having an average luminosity density higher than 8 x 10 exp 9 solar luminosity in the B band/Mpc cubed. The hierarchy is built on the mass density of the aggregates progressively formed by the method, corrected for the loss of faint galaxies with the distance. In this way, 264 groups of at least three members were identified, among which 82 have more than five members and are located at distances lower than 40 Mpc. It was found that (1) almost all the crossing times are lower than H0 exp -1, confirming the bound nature of the groups; (2) the median virial mass to blue luminosity ratio of the groups is 74 solar mass per solar luminosity in the B band; and (3) the M/L ratio increases with the group size, indicating the presence of dark matter around galaxies to a distance of 500 kpc.

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