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Title: A Catalog of Merging Dwarf Galaxies in the Local Universe

Abstract

We introduce the largest publicly available catalog of interacting dwarf galaxies. It includes 177 nearby merging dwarf galaxies of stellar mass M * < 10 10 M and redshifts z < 0.02. These galaxies are selected by visual inspection of publicly available archival imaging from two wide-field optical surveys (SDSS-III and the Legacy Survey), and they possess low-surface-brightness features that are likely the result of an interaction between dwarf galaxies. We list UV and optical photometric data that we use to estimate stellar masses and star formation rates. Currently, the study of interacting dwarf galaxies has largely been done on an individual basis, and lacks a sufficiently large catalog to give statistics on the properties of interacting dwarf galaxies, and their role in the evolution of low-mass galaxies. We anticipate that this public catalog can be used as a reference sample to investigate the effects of the tidal interaction on the evolution of star formation, and the morphology/structure of dwarf galaxies. Our sample is overwhelmingly dominated by star-forming galaxies, and they are generally found significantly below the red sequence in the color–magnitude relation. The number of early-type galaxies is only 3 out of 177. We classify them, according tomore » observed low-surface-brightness features, into various categories including shells, stellar streams, loops, antennae, or simply interacting. We determine that dwarf–dwarf interactions tend to prefer the low-density environment. Only 41 out of the 177 candidate dwarf–dwarf interaction systems have giant neighbors within a sky-projected distance of 700 kpc and a line-of-sight radial velocity range ±700 km s –1, and compared to the LMC–SMC, they are generally located at much larger sky-projected distances from their nearest giant neighbors.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [3];  [4]
  1. Yonsei Univ., Seoul (Korea, Republic of)
  2. Korea Astronomy and Space Science Inst., Daejeon (Korea, Republic of)
  3. Universidad de Concepción (Chile)
  4. Centre National de la Recherche Scientifique (CNRS), Strasbourg (France)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC); National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1544086
Grant/Contract Number:  
[AC02-05CH1123]
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Supplement Series (Online)
Additional Journal Information:
[Journal Name: The Astrophysical Journal. Supplement Series (Online); Journal Volume: 237; Journal Issue: 2]; Journal ID: ISSN 1538-4365
Publisher:
American Astronomical Society/IOP
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: dwarf; galaxies: evolution; galaxies: interactions; galaxies: star formation

Citation Formats

Paudel, Sanjaya, Smith, Rory, Yoon, Suk Jin, Calderón-Castillo, Paula, and Duc, Pierre-Alain. A Catalog of Merging Dwarf Galaxies in the Local Universe. United States: N. p., 2018. Web. doi:10.3847/1538-4365/aad555.
Paudel, Sanjaya, Smith, Rory, Yoon, Suk Jin, Calderón-Castillo, Paula, & Duc, Pierre-Alain. A Catalog of Merging Dwarf Galaxies in the Local Universe. United States. doi:10.3847/1538-4365/aad555.
Paudel, Sanjaya, Smith, Rory, Yoon, Suk Jin, Calderón-Castillo, Paula, and Duc, Pierre-Alain. Wed . "A Catalog of Merging Dwarf Galaxies in the Local Universe". United States. doi:10.3847/1538-4365/aad555. https://www.osti.gov/servlets/purl/1544086.
@article{osti_1544086,
title = {A Catalog of Merging Dwarf Galaxies in the Local Universe},
author = {Paudel, Sanjaya and Smith, Rory and Yoon, Suk Jin and Calderón-Castillo, Paula and Duc, Pierre-Alain},
abstractNote = {We introduce the largest publicly available catalog of interacting dwarf galaxies. It includes 177 nearby merging dwarf galaxies of stellar mass M * < 1010 M ⊙ and redshifts z < 0.02. These galaxies are selected by visual inspection of publicly available archival imaging from two wide-field optical surveys (SDSS-III and the Legacy Survey), and they possess low-surface-brightness features that are likely the result of an interaction between dwarf galaxies. We list UV and optical photometric data that we use to estimate stellar masses and star formation rates. Currently, the study of interacting dwarf galaxies has largely been done on an individual basis, and lacks a sufficiently large catalog to give statistics on the properties of interacting dwarf galaxies, and their role in the evolution of low-mass galaxies. We anticipate that this public catalog can be used as a reference sample to investigate the effects of the tidal interaction on the evolution of star formation, and the morphology/structure of dwarf galaxies. Our sample is overwhelmingly dominated by star-forming galaxies, and they are generally found significantly below the red sequence in the color–magnitude relation. The number of early-type galaxies is only 3 out of 177. We classify them, according to observed low-surface-brightness features, into various categories including shells, stellar streams, loops, antennae, or simply interacting. We determine that dwarf–dwarf interactions tend to prefer the low-density environment. Only 41 out of the 177 candidate dwarf–dwarf interaction systems have giant neighbors within a sky-projected distance of 700 kpc and a line-of-sight radial velocity range ±700 km s–1, and compared to the LMC–SMC, they are generally located at much larger sky-projected distances from their nearest giant neighbors.},
doi = {10.3847/1538-4365/aad555},
journal = {The Astrophysical Journal. Supplement Series (Online)},
number = [2],
volume = [237],
place = {United States},
year = {2018},
month = {8}
}

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