H-alpha survey of nearby dwarf galaxies
S. S. Kaisin, I. D. Karachentsev, S. Ravindranath
TL;DR
This paper provides H-alpha imaging data for 30 nearby dwarf galaxies, enabling analysis of their star formation rates and properties, with some galaxies showing no current star formation activity.
Contribution
It offers new H-alpha flux measurements for a sample of local dwarf galaxies, facilitating star formation studies in these low-mass systems.
Findings
Median distance of 7.5 Mpc for the sample
Cetus and Leo IV show no signs of star formation
ESO 553-46 has a high specific star formation rate
Abstract
We present the H-alpha imaging data and flux measurements for 30 dwarf galaxies in the Local volume. The H-alpha fluxes are used to derive the galaxy star formation rate, SFR. The sample of observed galaxies is characterized by the following parameters: the median distance of 7.5 Mpc, the median blue absolute magnitude of -14.8 mag, and median SFR of -2.0 dex. Two dSph members of the Local Group: Cetus and Leo IV do not show signs of star formation on the rate of -5.4 dex and -7.0 dex, respectively. The BCD galaxy ESO 553-46 has one of the highest specific SFR among the Local volume galaxies.
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