TY - JOUR
T1 - Tidal Destruction in a Low-mass Galaxy Environment
T2 - The Discovery of Tidal Tails around DDO 44
AU - Carlin, Jeffrey L.
AU - Garling, Christopher T.
AU - Peter, Annika H.G.
AU - Crnojević, Denija
AU - Forbes, Duncan A.
AU - Hargis, Jonathan R.
AU - Mutlu-Pakdil, Burçin
AU - Pucha, Ragadeepika
AU - Romanowsky, Aaron J.
AU - Sand, David J.
AU - Spekkens, Kristine
AU - Strader, Jay
AU - Willman, Beth
N1 - Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - We report the discovery of a ⪆1° (∼50 kpc) long stellar tidal stream emanating from the dwarf galaxy DDO 44, a likely satellite of Local Volume galaxy NGC 2403 located ∼70 kpc in projection from its companion. NGC 2403 is a roughly Large Magellanic Cloud (LMC) stellar-mass galaxy 3 Mpc away, residing at the outer limits of the M81 group. We are mapping a large region around NGC 2403 as part of our 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 ∼25%-30% of the luminosity in the streams. Analogs of ∼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.
AB - We report the discovery of a ⪆1° (∼50 kpc) long stellar tidal stream emanating from the dwarf galaxy DDO 44, a likely satellite of Local Volume galaxy NGC 2403 located ∼70 kpc in projection from its companion. NGC 2403 is a roughly Large Magellanic Cloud (LMC) stellar-mass galaxy 3 Mpc away, residing at the outer limits of the M81 group. We are mapping a large region around NGC 2403 as part of our 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 ∼25%-30% of the luminosity in the streams. Analogs of ∼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.
UR - http://www.scopus.com/inward/record.url?scp=85077227912&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85077227912&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/ab4c32
DO - 10.3847/1538-4357/ab4c32
M3 - Article
AN - SCOPUS:85077227912
SN - 0004-637X
VL - 886
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 109
ER -