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Nearby groups of galaxies in the Hercules–Bootes constellations

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Abstract

We consider a sample of 412 galaxies with radial velocities V LG < 2500 kms−1 situated in the sky region of RA = 13. m 0–19. m 0, Dec = +10◦...+40◦ between the Local Void and the Supergalactic plane. One hundred and eighty-one of them have individual distance estimates. Peculiar velocities of the galaxies as a function of Supergalactic latitude SGB show signs of Virgocentric infall at SGB < 10◦ and motion from the Local Void at SGB > 60◦. A half of the Hercules–Bootes galaxies belong to 17 groups and 29 pairs, with the richest group around NGC5353. A typical group is characterized by the velocity dispersion of 67 km s−1, the harmonic radius of 182 kpc, the stellar mass of 4.3 × 1010 M ⊙ and the virialto- stellar mass ratio of 32. The binary galaxies have the mean radial velocity difference of 37 kms−1, the projected separation of 96 kpc, the mean integral stellar mass of 2.6×109M ⊙ and the mean virial-to-stellar mass ratio of about 8. The total dark-matter-to-stellar mass ratio in the considered sky region amounts to 37 being almost the same as that in the Local Volume.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, 369167, Russia

    I. D. Karachentsev & O. G. Kashibadze

  2. Main Astronomical Observatory of National Academy of Sciences of Ukraine, Kiev, 03143, Ukraine

    V. E. Karachentseva

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

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Original Russian Text © I.D. Karachentsev, O. G. Kashibadze, V.E. Karachentseva, 2017, published in Astrofizicheskii Byulleten’, 2017, Vol. 72, No. 2, pp. 122–133.

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Karachentsev, I.D., Kashibadze, O.G. & Karachentseva, V.E. Nearby groups of galaxies in the Hercules–Bootes constellations. Astrophys. Bull. 72, 111–121 (2017). https://doi.org/10.1134/S1990341317020031

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  • DOI: https://doi.org/10.1134/S1990341317020031

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