English

Galaxy motions in the Bootes strip

Cosmology and Nongalactic Astrophysics 2015-06-19 v2 Astrophysics of Galaxies

Abstract

We explore the structure and kinematics of a dispersed filament of galaxies residing between the Local Void and the Virgo cluster. For such purpose, we consider a sample of 361 galaxies with radial velocities VLG<2000V_{LG} < 2000 km/s inside the sky area of RA = [13.0 ... 18.0]h^h and Dec. = [-5 ... ++10]^\circ. At present, 161 of them have individual distance estimates. The galaxy distribution on peculiar velocities along the strip exhibits the known Virgo-centric infall at RA < 14h^h and some signs of outflow from the Local Void at RA > 17h^h. Majority of the Bootes strip galaxies (56%) belong to 13 groups and 11 pairs, with the most prominent group around NGC5846. The Bootes strip groups reside within [17-27]Mpc, being all farther from us than the Virgo cluster. The Bootes filament contains the total stellar mass of 2.7×1012M2.7\times10^{12} M_\odot and the total virial mass of 9.07×1013M9.07\times10^{13} M_\odot, having the average density of dark matter to be Ωm=0.09\Omega_m = 0.09, i.e. a factor three lower than the global cosmic average.

Keywords

Cite

@article{arxiv.1406.2467,
  title  = {Galaxy motions in the Bootes strip},
  author = {Igor D. Karachentsev and Valentina E. Karachentseva and Olga G. Nasonova},
  journal= {arXiv preprint arXiv:1406.2467},
  year   = {2015}
}

Comments

19 pages, 7 figures, 3 tables. Accepted by Astrofizika

R2 v1 2026-06-22T04:34:48.980Z