The LBT satellites of Nearby Galaxies Survey (LBT-SONG): The satellite population of NGC 628

A. Bianca Davis, Anna M. Nierenberg, Annika H.G. Peter, Christopher T. Garling, Johnny P. Greco, Christopher S. Kochanek, Dyas Utomo, Kirsten J. Casey, Richard W. Pogge, Daniella M. Roberts, David J. Sand, Amy Sardone

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We present the first satellite system of the Large Binocular Telescope Satellites Of Nearby Galaxies Survey (LBT-SONG), a survey to characterize the close satellite populations of LargeMagellanic Cloud to Milky-Way-mass, star-forming galaxies in the Local Volume. In this paper, we describe our unresolved diffuse satellite finding and completeness measurement methodology and apply this framework to NGC 628, an isolated galaxy with∼1/4 the stellarmass of the MilkyWay.We present two new dwarf satellite galaxy candidates: NGC 628 dwA, and dwB with MV = -12.2 and -7.7, respectively. NGC 628 dwA is a classical dwarf while NGC 628 dwB is a low-luminosity galaxy that appears to have been quenched after reionization. Completeness corrections indicate that the presence of these two satellites is consistent with CDM predictions. The satellite colours indicate that the galaxies are neither actively star forming nor do they have the purely ancient stellar populations characteristic of ultrafaint dwarfs. Instead, and consistent with our previous work on the NGC 4214 system, they show signs of recent quenching, further indicating that environmental quenching can play a role in modifying satellite populations even for hosts smaller than the Milky Way.

Original languageEnglish (US)
Pages (from-to)3854-3869
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume500
Issue number3
DOIs
StatePublished - Jan 1 2021

Keywords

  • Galaxies: Dwarf

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint

Dive into the research topics of 'The LBT satellites of Nearby Galaxies Survey (LBT-SONG): The satellite population of NGC 628'. Together they form a unique fingerprint.

Cite this