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Structure and kinematics of the Bootes filament

Published online by Cambridge University Press:  12 October 2016

O. Nasonova ,
I. Karachentsev  and
V. Karachentseva
O. Nasonova
Affiliation:
Special Astrophysical Observatory of RAS, Nizhnij Arkhyz, Russia
I. Karachentsev
Affiliation:
Special Astrophysical Observatory of RAS, Nizhnij Arkhyz, Russia
V. Karachentseva
Affiliation:
Main Astronomical Observatory of NASU, Kyiv, Ukraine
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Abstract

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Bootes filament of galaxies is a dispersed chain of groups residing on sky between the Local Void and the Virgo cluster. We consider a sample of 361 galaxies inside the sky area of RA = 13h0...18h.5 and Dec = .5°... + 10° with radial velocities VLG < 2000 km/s to clarify its structure and kinematics. In this region, 161 galaxies have individual distance estimates. We use these data to draw the Hubble relation for galaxy groups, pairs as well as the field galaxies, and to examine the galaxy distribution on peculiar velocities. Our analysis exposes the known Virgo-centric infall at RA < 14h and some signs of outflow from the Local Void at RA > 17h. According to the galaxy grouping criterion, this complex contains the members of 13 groups, 11 pairs and 140 field galaxies. The most prominent group is dominated by NGC 5846. The Bootes filament contains the total stellar mass of 2.7 ×1012M⊙ and the total virial mass of 9.07×1013M⊙, having the average density of dark matter to be Ωm = 0.09, i.e. a factor three lower than the global cosmic value.

Keywords

galaxies: distances and redshiftscosmology: large-scale structure of universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 187 - 192
Copyright
Copyright © International Astronomical Union 2016 

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