Detailed Study of the Ursa Major Supercluster of Galaxies Using the 2MASS and SDSS Catalogs

Details Detailed Study of the Ursa Major Supercluster of Galaxies Using the 2MASS and SDSS Catalogs Detailed Study of the Ursa Major Supercluster of Galaxies Using the 2MASS and SDSS Catalogs

2006-04-17

arxiv.org/abs/astro-ph/0604351v1

Astron.Lett. 32 (2006) 84-90; Pisma Astron.Zh. 32 (2006) 95-101

Astronomy and Astrophysics

Astrophysics

16 pages, 5 figures

Scientific paper

10.1134/S1063773706020022

We study the infrared (K_s band) properties of clusters of galaxies in the Ursa Major supercluster using data from 2MASS (Two-Micron All-Sky Survey) and SDSS (Sloan Digital Sky Survey). We identified three large filaments with mean redshifts of z = 0.051, 0.060, and 0.071. All clusters of the supercluster are located in these filaments. We determined the total K_s-band luminosities and masses for 11 clusters of galaxies within comparable physical regions (within a radius R_200 close to the virial radius) using a homogeneous method. We constructed a combined luminosity function for the supercluster in this region, which can be described by the Schechter function with the following parameters: M*_K = -24^m.50 and \alpha = -0.98. The infrared luminosities of the clusters of galaxies correlate with their masses; the M/L_K ratios of the systems increase with their masses (luminosities), with most of the Ursa Major clusters of galaxies (particularly the richer ones) closely following the relations derived previously for a large sample of clusters and groups of galaxies. The total mass-to-infrared-luminosity ratio is 52 M_{\odot}/L_{\odot} for six Abell clusters and 49 M_{\odot}/L_{\odot} for all of the clusters, except Anon2.

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