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Ultra-flat galaxies selected from RFGC catalog. I. The sample properties

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Abstract

We used the Revised Flat Galaxy Catalog (RFGC) to create a sample of ultra-flat galaxies (UFG) covering the whole northern and southern sky apart from theMilkyWay zone. It contains 817 spiral galaxies seen edge-on, selected into theUFG sample according to their apparent axial ratios (a/b) B ≥ 10.0 and (a/b) R ≥ 8.53 in the blue and red bands, respectively. Within this basic sample we fixed an exemplary sample of 441 UFG galaxies having the radial velocities of V LG < 10000 km s−1, Galactic latitude of | b |> 10° and the blue angular diameter of a B > 1.′0. According to the Schmidt test the exemplary sample of 441 galaxies is characterized by about (80–90)% completeness, what is quite enough to study different properties of the ultra-flat galaxies. We found that more than 3/4 of UFGs have the morphological types within the narrow range of T = 7± 1, i.e. the thinnest stellar disks occur among the Scd, Sd, and Sdm types. The average surface brightness of UFG galaxies tends to diminish towards the flattest bulge-less galaxies. Regularly shaped disks without signs of asymmetrymake up about 2/3 both among all the RFGC galaxies, and the UFG sample objects. About 60% of ultra-flat galaxies can be referred to dynamically isolated objects, while 30% of them probably belong to the scattered associations (filaments, walls), and only about 10% of them are dynamically dominating galaxies with respect to their neighbours.

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Authors and Affiliations

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

    V. E. Karachentseva

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

    Yu. N. Kudrya

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

    I. D. Karachentsev & D. I. Makarov

  4. Taras Shevchenko National University of Kiev, Kiev, 01033, Ukraine

    O. V. Melnyk

Authors
  1. V. E. Karachentseva
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  2. Yu. N. Kudrya
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  3. I. D. Karachentsev
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  4. D. I. Makarov
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  5. O. V. Melnyk
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Correspondence to I. D. Karachentsev or D. I. Makarov.

Additional information

Original Russian Text © V.E. Karachentseva, Yu.N. Kudrya, I.D. Karachentsev, D.I. Makarov, O.V. Melnyk, 2016, published in Astrofizicheskii Byulleten, 2016, Vol. 71, No. 1, pp. 1–13.

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Karachentseva, V.E., Kudrya, Y.N., Karachentsev, I.D. et al. Ultra-flat galaxies selected from RFGC catalog. I. The sample properties. Astrophys. Bull. 71, 1–13 (2016). https://doi.org/10.1134/S1990341316010016

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  • DOI: https://doi.org/10.1134/S1990341316010016

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