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Ha Images of Ultra-Flat Edge-On Spiral Galaxies

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Abstract—We present the Hα images of ultra-flat (UF) spiral galaxies seen practically edgeon. The galaxies have the angular diameter in the B band \(a > 1.9' \) and the apparent axial ratio (a/b) > 10. We found that their Hα images look, on average, almost two times thinner than those in the red continuum. The star-formation rate in the studied objects, determined from the Hα flux, is in good agreement with that calculated from the FUV flux from the GALEX survey if we use the modified Verheijen and Sancisi formula taking into account the internal extinction in the UF galaxies. The logarithm of the specific star-formation rate in the UF galaxies shows a small scatter, 0.19, with a smooth decrease from –10.4 for dwarf spirals to –10.7 for massive ones. The relative amount of the hydrogen mass in UF disks varies from about 50% in dwarf disks to about 8% in massive ones. Structural distortions are less common in the UF galaxies (about 16%) than those in thick (less isolated) disks of edge-on spiral galaxies. On the cosmic time scale, 13.7 Gyr, large spiral disks are more efficient “engines” for gas processing into stars than dwarf spirals.

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Notes

  1. http://galex.stsci.edu/GalexView/.

  2. This integral-shaped galaxy is highly isolated. Its nearest neighbor, the galaxy CGCG308-039, has a radial velocity difference of 228 km s–1 and a projected separation of 410 kpc.

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ACKNOWLEDGMENTS

In this paper, we used the data of the GALEX and PanSTARRS sky surveys as well as the HyperLEDA extragalactic database.

Funding

This work was partially supported by the Russian Science Foundation, grant 19-12-00145.

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Authors and Affiliations

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

    S. S. Kaisin & I. D. Karachentsev

  2. Institute of Astronomy (IA) of the UNAM, 04510, Mexico City, Mexico

    H. Hernandez-Toledo

  3. National Astronomical Observatory, 22800, Ensenada, Mexico

    L. Gutierrez

  4. Main Astronomical Observatory NAS of Ukraine, 03143, Kyiv, Ukraine

    V. E. Karachentseva

Authors
  1. S. S. Kaisin
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  2. I. D. Karachentsev
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  3. H. Hernandez-Toledo
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  4. L. Gutierrez
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  5. V. E. Karachentseva
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Correspondence to S. S. Kaisin.

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Translated by N. Oborina

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Kaisin, S.S., Karachentsev, I.D., Hernandez-Toledo, H. et al. Ha Images of Ultra-Flat Edge-On Spiral Galaxies. Astrophys. Bull. 75, 1–11 (2020). https://doi.org/10.1134/S1990341320010046

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  • DOI: https://doi.org/10.1134/S1990341320010046

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