New Halpha flux measurements in nearby dwarf galaxies
S.S. Kaisin, I.D. Karachentsev
TL;DR
This paper presents Halpha emission images for 40 nearby dwarf galaxies, enabling the calculation of their star formation rates and revealing starburst activity in two specific galaxies.
Contribution
It provides new Halpha flux measurements for a diverse sample of local dwarf galaxies, including satellites, and compares these with FUV-based SFR estimates.
Findings
Halpha fluxes used to determine SFR and sSFR for 40 galaxies.
Two galaxies identified as being at peak starburst activity.
Comparison shows consistency and highlights starburst phases.
Abstract
We present the emission Halpha line images for 40 galaxies of the Local Volume based on the observations at the 6-meter BTA telescope. Among them there are eight satellites of the Milky Way and Andromeda M31 as well as two companions to M51. The measured Halpha fluxes of the galaxies are used to determine their integral (SFR) and specific (sSFR) star formation rates. The values of Log(sSFR) for the observed galaxies lie in the range of (-9, -14)/yr. A comparison of SFR estimates derived from the Halpha flux and from the ultraviolet FUV flux yields evidence that two blue compact galaxies MRK 475 and LV J1213+2957 turn out to be at a sharp peak of their star-burst activity.
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