English

Extending the $H\alpha$ survey for the local volume galaxies

Astrophysics of Galaxies 2015-12-17 v2

Abstract

Images in the HαH\alpha emission line are presented for 35 nearby objects observed with the 6-m BTA telescope. Three of them, NGC 3377, NGC 3384, and NGC 3390, are bright E and S0 galaxies, one is an edge-on Sd galaxy UGC 7321, two are remote globular clusters associated with M 31, and the rest are dwarf galaxies of morphological types dIr, dTr, dSph, BCD, and Sm. The measured HαH\alpha fluxes are used to estimate the integral (SFR)(SFR) and specific (sSFR)(sSFR) star formation rates for these galaxies. The values of log[sSFR]\log[sSFR] for all these objects lie below a limit of 0.4-0.4(Gyr1)^{-1}). We note that the emission disk for the nearest superthin edge-on galaxy UGC 7321 has an extremely large axis ratio of a/b=38.a/b = 38.

Keywords

Cite

@article{arxiv.1512.03151,
  title  = {Extending the $H\alpha$ survey for the local volume galaxies},
  author = {I. D. Karachentsev and S. S. Kaisin and E. I. Kaisina},
  journal= {arXiv preprint arXiv:1512.03151},
  year   = {2015}
}

Comments

20 pages, 1 table, 1 figure, published in Astrophysics, 2015, Vol. 58, No. 4, pp. 487-504