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Low density structures in the local universe. I. Diffuse agglomerates of galaxies

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Abstract

This paper is the first of a series considering the properties of distribution of nearby galaxies in the low density regions. Among 7596 galaxies with radial velocities V LG < 3500 km/s, absolute magnitudes M K < −18ṃ4, and Galactic latitudes |b| > 15° there are 3168 field galaxies (i.e. 42%) that do not belong to pairs, groups or clusters in the Local universe. Applying to this sample the percolation method with a radius of r 0 = 2.8Mpc, we found 226 diffuse agglomerates with n ≥ 4 number of members. The structures of eight most populated objects among them (n ≥ 25) are discussed. These non-virialized agglomerates are characterized by amedian dispersion of radial velocities of about 170 km/s, the linear size of around 6 Mpc, integral K-band luminosity of 3 × 1011 L ⊙, and a formal virial-mass-to-luminosity ratio of about 700M ⊙/L ⊙. The mean density contrast for the considered agglomerates is only \(\left\langle {\Delta n/\bar n} \right\rangle \) ∼ 5, and their crossing time is about 30–40 Gyr.

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Authors and Affiliations

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

    I. D. Karachentsev & D. I. Makarov

  2. Main Astronomical Observatory, National Academy of Sciences, Kiev, 03680, Ukraine

    V. E. Karachentseva & A. A. Elyiv

  3. Astronomical Observatory, Taras Shevchenko National University of Kiev, 04053, Kiev, Ukraine

    O. V. Melnyk

  4. Institut d’Astrophysique et de Geophysique, Université de Liège, Liège, B5C B4000, Belgium

    O. V. Melnyk & A. A. Elyiv

Authors
  1. I. D. Karachentsev
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  2. V. E. Karachentseva
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  3. O. V. Melnyk
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  4. A. A. Elyiv
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  5. D. I. Makarov
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Original Russian Text © I.D. Karachentsev, V.E. Karachentseva, O.V. Melnyk, A.A. Elyiv, D.I. Makarov, 2012, published in Astrofizicheskii Byulleten, 2012, Vol. 67, No. 4, pp. 367–375.

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Karachentsev, I.D., Karachentseva, V.E., Melnyk, O.V. et al. Low density structures in the local universe. I. Diffuse agglomerates of galaxies. Astrophys. Bull. 67, 353–361 (2012). https://doi.org/10.1134/S1990341312040013

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  • DOI: https://doi.org/10.1134/S1990341312040013

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