FIRST RESULTS FROM THE MADCASH SURVEY: A FAINT DWARF GALAXY COMPANION TO THE LOW-MASS SPIRAL GALAXY NGC 2403 AT 3.2 MPC

被引：82

作者：

Carlin, Jeffrey L. ^{[1
,2
,3
]}

Sand, David J. ^{[4
]}

Price, Paul ^{[5
]}

Willman, Beth ^{[1
,2
,3
]}

Karunakaran, Ananthan ^{[6
]}

Spekkens, Kristine ^{[6
,7
]}

Bell, Eric F. ^{[8
]}

Brodie, Jean P. ^{[9
]}

Crnojevic, Denija ^{[4
]}

Forbes, Duncan A. ^{[10
]}

Hargis, Jonathan ^{[11
]}

Kirby, Evan ^{[12
]}

Lupton, Robert ^{[5
]}

Peter, Annika H. G. ^{[13
,14
]}

Romanowsky, Aaron J. ^{[9
,15
]}

Strader, Jay ^{[16
]}

机构：

[1] LSST, 933 North Cherry Ave, Tucson, AZ 85721 USA

[2] Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA

[3] Haverford Coll, Dept Astron, 370 Lancaster Ave, Haverford, PA 19041 USA

[4] Texas Tech Univ, Dept Phys, Box 41051, Lubbock, TX 79409 USA

[5] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[6] Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada

[7] Royal Mil Coll Canada, Dept Phys, POB 17000, Kingston, ON K7L 7B4, Canada

[8] Univ Michigan, Dept Astron, 1085 South Univ Ave, Ann Arbor, MI 48109 USA

[9] Univ Calif Observ, 1156 High St, Santa Cruz, CA 95064 USA

[10] Swinburne Univ, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[11] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[12] CALTECH, 1200 E Calif Blvd,MC 249-17, Pasadena, CA 91125 USA

[13] Ohio State Univ, Dept Phys, CCAPP, 174 W 18th Ave, Columbus, OH 43210 USA

[14] Ohio State Univ, Dept Astron, 174 W 18Th Ave, Columbus, OH 43210 USA

[15] San Jose State Univ, Dept Phys & Astron, One Washington Sq, San Jose, CA 95192 USA

[16] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2016年 / 828卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

dark matter; galaxies: dwarf; galaxies: formation; galaxies: halos; MILKY-WAY SATELLITES; STAR-FORMATION RATES; DIGITAL SKY SURVEY; RED GIANT BRANCH; LOCAL VOLUME; LAMBDA-CDM; HALO; DISCOVERY; DARK; SIMULATIONS;

D O I：

10.3847/2041-8205/828/1/L5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of the faintest known dwarf galaxy satellite of a Large Magellanic Cloud (LMC) stellar-mass host beyond the Local Group (LG), based on deep imaging with Subaru/Hyper Suprime-Cam. Magellanic Analog Dwarf Companions And Stellar Halos (MADCASH). J074238+652501-dw lies similar to 35 kpc in projection from NGC 2403, a dwarf spiral galaxy at D approximate to 3.2 Mpc. This new dwarf has Mg = -7.4 +/- 0.4 and a half- light radius of 168 +/- 70. pc, at the calculated distance of 3.39 +/- 0.41 Mpc. The color-magnitude diagram reveals no evidence of young stellar populations, suggesting that MADCASH. J074238+652501-dw is an old, metal-poor dwarf similar to low-luminosity dwarfs in the LG. The lack of either detected HI gas (M-HI/L-V < 0.69M circle dot/L circle dot,based on Green Bank Telescope observations) or GALEX NUV/FUV flux enhancement is consistent with a lack of young stars. This is the first result from the MADCASH survey, which is conducting a census of the stellar substructure and faint satellites in the halos of Local Volume LMC analogs via resolved stellar populations. Models predict a total of similar to 4-10 satellites at least as massive as MADCASH. J074238+652501-dw around a host with the mass of NGC 2403, with 2-3 within our field of view, slightly more than the one such satellite observed in our footprint.

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