Galaxy motions in the Bootes strip

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. = [\(-...

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Bibliographic Details
Published in:arXiv.org 2014-06
Main Authors: Karachentsev, Igor D, Karachentseva, Valentina E, Nasonova, Olga G
Format: Article
Language:English
Subjects:
Dark matter
Galactic clusters
Galaxies
Galaxy distribution
Kinematics
Outflow
Stars & galaxies
Stellar mass
Strip
Virgo galactic cluster
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Summary: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]\(^\circ\). 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 < 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 \(2.7\times10^{12} M_\odot\) and the total virial mass of \(9.07\times10^{13} M_\odot\), having the average density of dark matter to be \(\Omega_m = 0.09\), i.e. a factor three lower than the global cosmic average.
ISSN:2331-8422
DOI:10.48550/arxiv.1406.2467