B,V,I - photometry of 20 dwarf irregular galaxies within 10 Mpc

TL;DR

This study provides detailed B, V, I photometry and surface brightness profiles for 20 dwarf irregular galaxies within 10 Mpc, highlighting challenges in fitting their profiles with standard models.

Contribution

It offers new integrated magnitudes and surface brightness profiles for 20 nearby dwarf irregular galaxies, contributing to a larger project imaging 500 such galaxies.

Findings

Surface brightness profiles often poorly fit by Sersic models.

Inner cores and outer exponential profiles show complex structures.

Data aids understanding of dwarf galaxy properties in the Local Volume.

Abstract

CCD - photometry is presented for 20 dIrr galaxies situated in the nearby complexes CenA/M83, and CVnI as well as in the general field of the Local Volume. We present integrated magnitudes of the galaxies in B,V,I - bands and also surface brightness profiles to a median isophote mu_B ~ 28 mag /sq.arcsec. The popular Sersic parameterization of surface brightness profiles generally does a poor job of simultaneously fitting the inner cores and outer exponential surface brightness fall-offs observed in many of our targets. The observed sample is a part of a general project to image about 500 nearby (D < 10 Mpc) dwarf galaxies in multiple bands.