H-alpha Survey of the Local Volume: Isolated Southern Galaxies
S. S. Kaisin, A. V. Kasparova, A. Yu. Knyazev, and I. D. Karachentsev
TL;DR
This study presents H-alpha observations of 11 isolated southern galaxies within 1 to 7 Mpc, measuring their star formation rates and gas depletion times to understand their evolutionary status.
Contribution
It provides new H-alpha flux measurements and star formation data for a sample of isolated galaxies, expanding knowledge of their star-forming activity.
Findings
Star formation rates range from 10^{-4} to 10^{-1} solar masses per year.
Gas depletion times vary from 1/6 to 24 times the Hubble time.
The galaxies exhibit diverse star formation efficiencies.
Abstract
We present our H-alpha observations of 11 isolated southern galaxies: SDIG, PGC 51659, E 222-010, E 272-025, E 137-018, IC 4662, Sag DIG, IC 5052, IC 5152, UGCA 438, and E149-003, with distances from 1 to 7 Mpc. We have determined the total H-alpha fluxes from these galaxies. The star formation rates in these galaxies range from 10^{-1} (IC 4662) to 10^{-4}_{\odot}/yr (SDIG) and the gas depletion time at the observed star formation rates lies within the range from 1/6 to 24 Hubble times H_0^{-1} .
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