Morphological study of a sample of dwarf tidal galaxies using the C-A plane

TL;DR

This study uses the C-A plane to identify and analyze dwarf tidal galaxies, revealing their unique morphological properties and correlations with stellar mass and star formation rate, distinct from other galaxy types.

Contribution

Introduces the C-A plane as a tool for morphological identification of tidal dwarf galaxy candidates in turbulent environments.

Findings

Most TDGs occupy a distinct region in the C-A plane.

Stellar mass and SFR do not linearly correlate with C and A in TDGs.

TDGs show a high-redshift galaxy-like correlation between M_star and SFR.

Abstract

In this investigation, we determined the Concentration (C) and Asymmetry (A) parameters in a sample of Tidal Dwarf Galaxies (TDG) or candidate galaxies. Most of the galaxies in the sample were found to be in a very precise region of the C-A plane, which clearly separates them from other galaxies. In addition, the stellar mass ($M_{star}$) and the star formation rate ($SFR$) in the sample were determined using optical images and GALEX observations. The main results are: the $M_{star}$ and the $SFR$ in the TDG sample do not follow a linear correlation with the $C$ and $A$ respectively, as observed in the rest of galaxies and the $M_{star}$ and the $SFR$ have a linear correlation similar to that followed by galaxies at high redshift. Then, we can conclude that the C-A plane can be a useful method for the morphological identification of candidates for TDG or dwarf objects from very turbulent environments.