Galaxy motions in the Bootes strip

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 ... $+$10]${}^{\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 $2.7\times 10^{12}{M}_{\odot }$ and the total virial mass of $9.07\times 10^{13}{M}_{\odot }$, having the average density of dark matter to be ${\Omega }_m=0.09$, i.e. a factor three lower than the global cosmic average.

arXiv comment19 pages, 7 figures, 3 tables. Accepted by Astrofizika

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• Surveying the Local Supercluster Plane
• The DIVING${}^{3D}$ Survey -- Deep IFS View of Nuclei of Galaxies -- I. Definition and Sample Presentation
• Nearby groups of galaxies in the Hercules-Bootes constellations
• Impact of AGN and nuclear star formation on the ISM turbulence of galaxies: Insights from JWST/MIRI spectroscopy