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：81

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：

美国国家航空航天局; 美国国家科学基金会;

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.

引用

页数：6

共 46 条

[1] THE NINTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY: FIRST SPECTROSCOPIC DATA FROM THE SDSS-III BARYON OSCILLATION SPECTROSCOPIC SURVEY [J].

Ahn, Christopher P. ;

Alexandroff, Rachael ;

Prieto, Carlos Allende ;

Anderson, Scott F. ;

Anderton, Timothy ;

Andrews, Brett H. ;

Aubourg, Eric ;

Bailey, Stephen ;

Balbinot, Eduardo ;

Barnes, Rory ;

Bautista, Julian ;

Beers, Timothy C. ;

Beifiori, Alessandra ;

Berlind, Andreas A. ;

Bhardwaj, Vaishali ;

Bizyaev, Dmitry ;

Blake, Cullen H. ;

Blanton, Michael R. ;

Blomqvist, Michael ;

Bochanski, John J. ;

Bolton, Adam S. ;

Borde, Arnaud ;

Bovy, Jo ;

Brandt, W. N. ;

Brinkmann, J. ;

Brown, Peter J. ;

Brownstein, Joel R. ;

Bundy, Kevin ;

Busca, N. G. ;

Carithers, William ;

Carnero, Aurelio R. ;

Carr, Michael A. ;

Casetti-Dinescu, Dana I. ;

Chen, Yanmei ;

Chiappini, Cristina ;

Comparat, Johan ;

Connolly, Natalia ;

Crepp, Justin R. ;

Cristiani, Stefano ;

Croft, Rupert A. C. ;

Cuesta, Antonio J. ;

da Costa, Luiz N. ;

Davenport, James R. A. ;

Dawson, Kyle S. ;

de Putter, Roland ;

De Lee, Nathan ;

Delubac, Timothee ;

Dhital, Saurav ;

Ealet, Anne ;

Ebelke, Garrett L. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2012, 203 (02)

[2] Quantifying the faint structure of galaxies: the late-type spiral NGC 2403 [J].

Barker, Michael K. ;

Ferguson, Annette M. N. ;

Irwin, M. J. ;

Arimoto, N. ;

Jablonka, P. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 419 (02) :1489-1506

[3] EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATA [J].

Bechtol, K. ;

Drlica-Wagner, A. ;

Balbinot, E. ;

Pieres, A. ;

Simon, J. D. ;

Yanny, B. ;

Santiago, B. ;

Wechsler, R. H. ;

Frieman, J. ;

Walker, A. R. ;

Williams, P. ;

Rozo, E. ;

Rykoff, E. S. ;

Queiroz, A. ;

Luque, E. ;

Benoit-Levy, A. ;

Tucker, D. ;

Sevilla, I. ;

Gruendl, R. A. ;

da Costa, L. N. ;

Fausti Neto, A. ;

Maia, M. A. G. ;

Abbott, T. ;

Allam, S. ;

Armstrong, R. ;

Bauer, A. H. ;

Bernstein, G. M. ;

Bernstein, R. A. ;

Bertin, E. ;

Brooks, D. ;

Buckley-Geer, E. ;

Burke, D. L. ;

Carnero Rosell, A. ;

Castander, F. J. ;

Covarrubias, R. ;

D'Andrea, C. B. ;

DePoy, D. L. ;

Desai, S. ;

Diehl, H. T. ;

Eifler, T. F. ;

Estrada, J. ;

Evrard, A. E. ;

Fernandez, E. ;

Finley, D. A. ;

Flaugher, B. ;

Gaztanaga, E. ;

Gerdes, D. ;

Girardi, L. ;

Gladders, M. ;

Gruen, D. .

ASTROPHYSICAL JOURNAL, 2015, 807 (01)

[4]

Bellazzini M., 2008, MMSAI, V79, P440

[5] The Milky Way's bright satellites as an apparent failure of ΛCDM [J].

Boylan-Kolchin, Michael ;

Bullock, James S. ;

Kaplinghat, Manoj .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 422 (02) :1203-1218

[6] CONFIRMATION OF FAINT DWARF GALAXIES IN THE M81 GROUP [J].

Chiboucas, Kristin ;

Jacobs, Bradley A. ;

Tully, R. Brent ;

Karachentsev, Igor D. .

ASTRONOMICAL JOURNAL, 2013, 146 (05)

[7] THE EXTENDED HALO OF CENTAURUS A: UNCOVERING SATELLITES, STREAMS, AND SUBSTRUCTURES [J].

Crnojevic, D. ;

Sand, D. J. ;

Spekkens, K. ;

Caldwell, N. ;

Guhathakurta, P. ;

McLeod, B. ;

Seth, A. ;

Simon, J. D. ;

Strader, J. ;

Toloba, E. .

ASTROPHYSICAL JOURNAL, 2016, 823 (01)

[8] DISCOVERY OF A CLOSE PAIR OF FAINT DWARF GALAXIES IN THE HALO OF CENTAURUS A [J].

Crnojevic, D. ;

Sand, D. J. ;

Caldwell, N. ;

Guhathakurta, P. ;

McLeod, B. ;

Seth, A. ;

Simon, J. D. ;

Strader, J. ;

Toloba, E. .

ASTROPHYSICAL JOURNAL LETTERS, 2014, 795 (02)

[9] SMALL DWARF GALAXIES WITHIN LARGER DWARFS: WHY SOME ARE LUMINOUS WHILE MOST GO DARK [J].

D'Onghia, Elena ;

Lake, George .

ASTROPHYSICAL JOURNAL LETTERS, 2008, 686 (02) :L61-L65

[10] ELVIS: Exploring the Local Volume in Simulations [J].

Garrison-Kimmel, Shea ;

Boylan-Kolchin, Michael ;

Bullock, James S. ;

Lee, Kyle .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 438 (03) :2578-2596

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