Local volume TiNy titans: Gaseous dwarf-dwarf interactions in the local universe

Sarah Pearson, Gurtina Besla, Mary E. Putman, Katharina A. Lutz, Ximena Fernández, Sabrina Stierwalt, David R. Patton, Jinhyub Kim, Nitya Kallivayalil, Kelsey Johnson, Eon Chang Sung

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

In this paper, we introduce the Local Volume TiNy Titans sample (LV-TNT), which is a part of a larger body of work on interacting dwarf galaxies: TNT . This LV-TNT sample consists of 10 dwarf galaxy pairs in the Local Universe (<30 Mpc from MilkyWay), which span mass ratios ofM*,1/M*,2 < 20, projected separations <100 kpc, and pair member masses of log(M*/M⊙) <9.9. All 10 LV-TNT pairs have resolved synthesis maps of their neutral hydrogen, are located in a range of environments and captured at various interaction stages. This enables us to do a comparative study of the diffuse gas in dwarf-dwarf interactions and disentangle the gas lost due to interactions with haloes of massive galaxies, from the gas lost due to mutual interaction between the dwarfs. We find that the neutral gas is extended in the interacting pairs when compared to non-paired analogues, indicating that gas is tidally pre-processed. Additionally, we find that the environment can shape the HI distributions in the form of trailing tails and that the gas is not unbound and lost to the surroundings unless the dwarf pair is residing near a massive galaxy. We conclude that a nearby, massive host galaxy is what ultimately prevents the gas from being re-accreted. Dwarf-dwarf interactions thus represent an important part of the baryon cycle of low-mass galaxies, enabling the 'parking' of gas at large distances to serve as a continual gas supply channel until accretion by a more massive host.

Original languageEnglish (US)
Pages (from-to)1827-1846
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume459
Issue number2
DOIs
StatePublished - Jun 21 2016

Keywords

  • Galaxies: dwarf
  • Galaxies: evolution
  • Galaxies: interactions
  • Galaxies: kinematics and dynamics
  • Magellanic clouds

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Pearson, S., Besla, G., Putman, M. E., Lutz, K. A., Fernández, X., Stierwalt, S., Patton, D. R., Kim, J., Kallivayalil, N., Johnson, K., & Sung, E. C. (2016). Local volume TiNy titans: Gaseous dwarf-dwarf interactions in the local universe. Monthly Notices of the Royal Astronomical Society, 459(2), 1827-1846. https://doi.org/10.1093/mnras/stw757