The LBT satellites of Nearby Galaxies Survey (LBT-SONG): the satellite population of NGC 628
| Autor: | Christopher T. Garling, R. W. Pogge, Johnny P. Greco, Amy Sardone, A. B. Davis, D.M. Roberts, Anna Nierenberg, Annika H. G. Peter, K.J. Casey, Christopher S. Kochanek, Dyas Utomo, David J. Sand |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
education.field_of_study Stellar mass 010308 nuclear & particles physics Milky Way Population FOS: Physical sciences Astronomy and Astrophysics Large Binocular Telescope Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Satellite galaxy Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics education Large Magellanic Cloud 010303 astronomy & astrophysics Reionization Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 500:3854-3869 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staa3246 |
| Popis: | 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 Large Magellanic 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 $\sim1/4$ the stellar mass of the Milky Way. We present two new dwarf satellite galaxy candidates: NGC 628 dwA, and dwB with $\text{M}_{\text{V}}$ = $-12.2$ 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 colors 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. 17 pages, 11 figures |
| Databáze: | OpenAIRE |
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