Tidal destruction in a low mass galaxy environment: the discovery of tidal tails around DDO 44

Jeffrey L. Carlin; Christopher T. Garling; Annika H. G. Peter; Denija Crnojević; Duncan A. Forbes; Jonathan R. Hargis; Burçin Mutlu-Pakdil; Ragadeepika Pucha; Aaron J. Romanowsky; David J. Sand; Kristine Spekkens; Jay Strader; Beth Willman

doi:10.3847/1538-4357/ab4c32

paper

Tidal destruction in a low mass galaxy environment: the discovery of tidal tails around DDO 44

arXiv:1906.08260 · doi:10.3847/1538-4357/ab4c32

Abstract

We report the discovery of a $> 1^{\circ}$ ( $\sim 50$ kpc) long stellar tidal stream emanating from the dwarf galaxy DDO 44, a likely satellite of Local Volume galaxy NGC 2403 located $\sim 70$ kpc in projection from its companion. NGC 2403 is a roughly Large Magellanic Cloud stellar-mass galaxy 3 Mpc away, residing at the outer limits of the M 81 group. We are mapping a large region around NGC 2403 as part of our MADCASH (Magellanic Analogs' Dwarf Companions and Stellar Halos) survey, reaching point source depths (90% completeness) of ( $g, i$ ) = (26.5, 26.2). Density maps of old, metal-poor RGB stars reveal tidal streams extending on two sides of DDO 44, with the streams directed toward NGC 2403. We estimate total luminosities of the original DDO 44 system (dwarf and streams combined) to be $M_{i, tot} = - 13.4$ and $M_{g, tot} = - 12.6$ , with $\sim 25 - 30%$ of the luminosity in the streams. Analogs of $\sim$ LMC-mass hosts with massive tidally disrupting satellites are rare in the Illustris simulations, especially at large separations such as that of DDO 44. The few analogs that are present in the models suggest that even low-mass hosts can efficiently quench their massive satellites.

arXiv commentAccepted for publication in ApJ. Updated with minor changes in response to referee

Tidal destruction in a low mass galaxy environment: the discovery of tidal tails around DDO 44

Abstract

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