Tidal destruction in a low mass galaxy environment: the discovery of tidal tails around DDO 44. (arXiv:1906.08260v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Carlin_J/0/1/0/all/0/1">Jeffrey L. Carlin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Garling_C/0/1/0/all/0/1">Christopher T. Garling</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Peter_A/0/1/0/all/0/1">Annika H. G. Peter</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Crnojevic_D/0/1/0/all/0/1">Denija Crnojević</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Forbes_D/0/1/0/all/0/1">Duncan A. Forbes</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hargis_J/0/1/0/all/0/1">Jonathan R. Hargis</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mutlu_Pakdil_B/0/1/0/all/0/1">Burçin Mutlu-Pakdil</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pucha_R/0/1/0/all/0/1">Ragadeepika Pucha</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Romanowsky_A/0/1/0/all/0/1">Aaron J. Romanowsky</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sand_D/0/1/0/all/0/1">David J. Sand</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Spekkens_K/0/1/0/all/0/1">Kristine Spekkens</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Strader_J/0/1/0/all/0/1">Jay Strader</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Willman_B/0/1/0/all/0/1">Beth Willman</a>
We report the discovery of a $>1^circ$ ($sim50$ kpc) long stellar tidal
stream emanating from the dwarf galaxy DDO 44, a likely satellite of Local
Volume galaxy NGC 2403 located $sim70$ 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 $M_{i, rm{tot}} = -13.4$ and $M_{g, rm{tot}} =
-12.6$, with $sim25-30%$ 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.
We report the discovery of a $>1^circ$ ($sim50$ kpc) long stellar tidal
stream emanating from the dwarf galaxy DDO 44, a likely satellite of Local
Volume galaxy NGC 2403 located $sim70$ 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 $M_{i, rm{tot}} = -13.4$ and $M_{g, rm{tot}} =
-12.6$, with $sim25-30%$ 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.
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