# A catalog of merging dwarf galaxies in the local universe

**Authors:** Sanjaya Paudel, Rory Smith, Suk Jin Yoo, Paula Calderón-Castillo, Pierre-Alain Duc  
**arXiv:** [1807.07195](https://arxiv.org/abs/1807.07195)  
**Date:** 2018-07-19  
**Summary page:** https://www.summarizepaper.com/en/paper/1807.07195v1/

## Key points

- Study by Sanjaya Paudel et al. presents a catalog of 177 interacting dwarf galaxies in the local universe
- Galaxies selected based on visual inspection of archival imaging from SDSS III and the Legacy Survey
- Interactions between dwarf galaxies are crucial for galaxy evolution
- Interactions can lead to significant changes in the morphology and star formation rates of low-mass galaxies
- UV and optical photometric data used to estimate stellar masses and star formation rates
- Previous studies on interacting dwarf galaxies lacked a large catalog for statistical analysis
- Catalog provides valuable reference sample for studying effects of tidal interactions on star formation evolution and morphology changes
- Majority of sample consists of star-forming galaxies below the red-sequence in color-magnitude relation
- Only three out of 177 candidate systems classified as early-type galaxies based on observed features
- Interactions more common in low-density environments; only 41 systems have giant neighbors within specific distances and radial velocity ranges
- Interacting dwarf galaxies situated at larger distances from nearest giant neighbor compared to well-known examples like LMC-SMC pair

## Summary

In their study, Sanjaya Paudel, Rory Smith, Suk Jin Yoo, Paula Calderón-Castillo, and Pierre-Alain Duc present a comprehensive catalog of interacting dwarf galaxies in the local universe. This catalog comprises 177 nearby merging dwarf galaxies with stellar masses less than 10^10 solar masses and redshifts below 0.02. The selection of these galaxies was based on visual inspection of archival imaging from two wide-field optical surveys, namely SDSS III and the Legacy Survey. are a crucial aspect of galaxy evolution in the . In their extensive research, Paudel et al. have compiled a catalog of 177  that are currently undergoing . These interactions can lead to significant changes in the  and  of these low-mass galaxies. The authors provide UV and optical photometric data to estimate stellar masses and star formation rates for these interacting dwarf galaxies. They highlight that previous studies on interacting dwarf galaxies have been conducted on an individual basis, lacking a large catalog to analyze statistics on their properties and their role in the evolution of low-mass galaxies. This publicly available catalog serves as a valuable reference sample for investigating the effects of tidal interactions on star formation evolution and morphology/structure changes in dwarf galaxies. The majority of the sample consists of star-forming galaxies located significantly below the red-sequence in the color-magnitude relation. Among the 177 candidate systems, only three are classified as early-type galaxies based on observed low surface brightness features such as shells, stellar streams, loops, antennae or general signs of interaction. The authors note that interactions between dwarf-dwarf systems tend to occur more frequently in low-density environments. Interestingly, only 41 out of the 177 candidate systems have giant neighbors within specific sky-projected distances and radial velocity ranges. Compared to well-known examples like the LMC-SMC pair, these interacting dwarf galaxies are situated at much larger sky-projected distances from their nearest giant neighbor. Overall, this detailed catalog provides valuable insights into the characteristics and distribution of merging dwarf galaxies in our local universe. , , and  are key factors in understanding the evolution of these interacting dwarf galaxies. This study serves as a crucial reference for future research on these fascinating objects.