A search for satellite galaxies of nearby star-forming galaxies with resolved stars in LBT-SONG

Christopher T. Garling, Annika H.G. Peter, Christopher S. Kochanek, David J. Sand, Denija Crnojević

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We present results from a resolved stellar population search for dwarf satellite galaxies of six nearby (D < 5 Mpc), sub-Milky Way mass hosts using deep (m ∼27 mag) optical imaging from the Large Binocular Telescope. We perform image simulations to quantify our detection efficiency for dwarfs over a large range in luminosity and size, and develop a fast catalogue-based emulator that includes a treatment of unresolved photometric blending. We discover no new dwarf satellites, but we recover two previously known dwarfs (DDO 113 and LV J1228+4358) with MV < -12 that lie in our survey volume. We preview a new theoretical framework to predict satellite luminosity functions using analytical probability distribution functions and apply it to our sample, finding that we predict one fewer classical dwarf and one more faint dwarf (MV ∼-7.5) than we find in our observational sample (i.e. the observational sample is slightly top-heavy). However, the overall number of dwarfs in the observational sample (2) is in good agreement with the theoretical expectations. Interestingly, DDO 113 shows signs of environmental quenching and LV J1228+4358 is tidally disrupting, suggesting that low-mass hosts may affect their satellites more severely than previously believed.

Original languageEnglish (US)
Pages (from-to)4764-4778
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume507
Issue number4
DOIs
StatePublished - Nov 1 2021

Keywords

  • galaxies: dwarf
  • galaxies: evolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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