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Ultra-flat galaxies selected from RFGC catalog. II. Orbital estimates of halo masses

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Abstract

We used the Revised Flat Galaxy Catalog (RFGC) to select 817 ultra-flat (UF) edge-on disk galaxies with blue and red apparent axial ratios of (a/b)B > 10.0 and (a/b)R > 8.5. The sample covering the whole sky, except the Milky Way zone, contains 490 UF galaxies with measured radial velocities. Our inspection of the neighboring galaxies around them revealed only 30 companions with radial velocity difference of | ΔV |< 500 kms−1 inside the projected separation of R p < 250 kpc. Wherein, the wider area around the UF galaxy within R p < 750 kpc contains no other neighbors brighter than the UF galaxy itself in the same velocity span. The resulting sample galaxies mostly belong to the morphological types Sc, Scd, Sd. They have a moderate rotation velocity curve amplitude of about 120 km s−1 and a moderate K-band luminosity of about 1010 L ⊙. The median difference of radial velocities of their companions is 87 km s−1, yielding the median orbital mass estimate of about 5 × 1011 M ⊙. Excluding six probable non-isolated pairs, we obtained a typical halo-mass-to-stellar-mass of UF galaxies of about 30, what is almost the same one as in the principal spiral galaxies, like M31 and M81 in the nearest groups. We also note that ultra-flat galaxies look two times less “dusty” than other spirals of the same luminosity.

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Authors and Affiliations

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

    I. D. Karachentsev

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

    V. E. Karachentseva

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

    Yu. N. Kudrya

Authors
  1. I. D. Karachentsev
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  2. V. E. Karachentseva
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  3. Yu. N. Kudrya
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Correspondence to I. D. Karachentsev.

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Original Russian Text © I.D. Karachentsev, V.E. Karachentseva, Yu.N. Kudrya, 2016, published in Astrofizicheskii Byulleten’, 2016, Vol. 71, No. 2, pp. 139–149.

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Karachentsev, I.D., Karachentseva, V.E. & Kudrya, Y.N. Ultra-flat galaxies selected from RFGC catalog. II. Orbital estimates of halo masses. Astrophys. Bull. 71, 129–138 (2016). https://doi.org/10.1134/S1990341316020012

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  • DOI: https://doi.org/10.1134/S1990341316020012

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