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Motions of Galaxies in the Bootes Strip

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Astrophysics Aims and scope

We examine the structure and kinematics of the diffuse filament of galaxies lying between the Local Void and the Virgo cluster. For this we use a sample of 361 galaxies with radial velocities V LG <2000 km/s in the region of the sky with α (13h .0, 18h .0) and δ = (−5°, +10°). Individual distance estimates are currently available for 161 of them. The distribution of the galaxies with respect to their peculiar velocities along the strip manifests the known Virgo-centric infall for α <14h , as well as signs of an outflow of galaxies from the Local Void for α >17h . A majority (56%) of the galaxies in the Bootes strip belong to 13 groups and 11 pairs, of which the group around NGC 5846 is the most prominent. The groups in the Bootes strip are at distances of 17-29 Mpc from us, i.e., further than the Virgo cluster. The filament of galaxies in Bootes has a sum stellar mass of 2.7°1012 M ⊙ and a total virial mass of 9.07°1013 M ⊙ with an average density of dark matter of Ω m = 0.09 , or a factor of 3 lower than the global cosmic average.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Nizhnii Arkhiz, 369167, Russia

    I. D. Karachentsev & O. G. Nasonova

  2. Leibniz Institut für Astrophysik, Potsdam, Germany

    I. D. Karachentsev

  3. Main Astronomical Observatory, National Academy of Sciences of Ukraine, Kiev, Ukraine

    V. E. Karachentseva

Authors
  1. I. D. Karachentsev
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  2. V. E. Karachentseva
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  3. O. G. Nasonova
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Correspondence to I. D. Karachentsev.

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Translated from Astrofizika, Vol. 57, No. 4, pp. 495-511 (November 2014).

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Karachentsev, I.D., Karachentseva, V.E. & Nasonova, O.G. Motions of Galaxies in the Bootes Strip. Astrophysics 57, 457–472 (2014). https://doi.org/10.1007/s10511-014-9349-2

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  • DOI: https://doi.org/10.1007/s10511-014-9349-2

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