Motions of Galaxies in the Bootes Strip

2014/06/11 by I. D. Karachentsev, Igor D. Karachentsev, V. E. Karachentseva +3
Physics and Astronomy · #Astronomy and Astrophysical Research #Electrical and Electromagnetic Research #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO #astro-ph.GA

paper · pdf · doi:10.1007/s10511-014-9349-2

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

arxiv created 2014/06/11 · openalex publication_date 2014/11/18 · arxiv updated 2015/06/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

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 V_LG < 2000 km/s inside the sky area of RA = [13.0 ... 18.0]^h and Dec. = [-5 ... +10]^∘. 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 < 14^h and some signs of outflow from the Local Void at RA > 17^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 2.7×10¹² M_\odot and the total virial mass of 9.07×10¹³ M_\odot, having the average density of dark matter to be Ω_m = 0.09, i.e. a factor three lower than the global cosmic average.

Citations

• Cosmography of the Local Universe
• The Hubble flow around the Local Group
• Three‐YearWilkinson Microwave Anisotropy Probe(WMAP) Observations: Implications for Cosmology
• The ACS Virgo Cluster Survey. XIII. SBF Distance Catalog and the Three‐dimensional Structure of the Virgo Cluster