More galaxies in the Local Volume imaged in H-alpha

TL;DR

This study measures H-alpha fluxes for 52 nearby galaxies within 10 Mpc to estimate their star formation rates and analyze their properties, contributing to understanding local universe star formation.

Contribution

It provides new H-alpha flux measurements for a significant sample of Local Volume galaxies, enabling improved estimates of their star formation rates and local universe SFR density.

Findings

Total SFR density in the local universe is estimated at 0.019 M_sun yr^-1 Mpc^-3.

Derived scaling relations between SFR, hydrogen mass, and galaxy magnitude.

Most galaxies studied are probable members of known galaxy groups.

Abstract

We have carried out an H-alpha flux measurement for 52 nearby galaxies as part of a general H-alpha imaging survey for the Local Volume sample of galaxies within 10 Mpc. Most of the objects are probable members of the groups around Maffei 2/IC 342, NGC 672/IC 1727, NGC 784, and the Orion galaxy. The measured H-alpha fluxes corrected for extinction are used to derive the galaxy star formation rate (SFR). We briefly discuss some basic scaling relations between SFR, hydrogen mass and absolute magnitude of the Local Volume galaxies. The total SFR density in the local (z = 0) universe is estimated to be (0.019+/-0.003) M_sun yr/Mpc^3.