SAGITTARIUS II, DRACO II AND LAEVENS 3: THREE NEW MILKY WAY SATELLITES DISCOVERED IN THE PAN-STARRS 1 3π SURVEY

被引：183

作者：

Laevens, Benjamin P. M. ^{[1
,2
]}

Martin, Nicolas F. ^{[1
,2
]}

Bernard, Edouard J. ^{[3
]}

Schlafly, Edward F. ^{[2
]}

Sesar, Branimir ^{[2
]}

Rix, Hans-Walter ^{[2
]}

Bell, Eric F. ^{[4
]}

Ferguson, Annette M. N. ^{[3
]}

Slater, Colin T. ^{[4
]}

Sweeney, William E. ^{[5
]}

Wyse, Rosemary F. G. ^{[6
]}

Huxor, Avon P. ^{[7
]}

Burgett, William S. ^{[8
]}

Chambers, Kenneth C. ^{[5
]}

Draper, Peter W. ^{[9
]}

Hodapp, Klaus A. ^{[5
]}

Kaiser, Nicholas ^{[5
]}

Magnier, Eugene A. ^{[5
]}

Metcalfe, Nigel ^{[8
]}

Tonry, John L. ^{[5
]}

Wainscoat, Richard J. ^{[5
]}

Waters, Christopher ^{[5
]}

机构：

[1] Univ Strasbourg, CNRS, Observ Astron Strasbourg, UMR 7550, F-67000 Strasbourg, France

[2] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[3] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland

[4] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[5] Univ Hawaii Manoa, Inst Astron, Honolulu, HI 96822 USA

[6] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[7] Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, D-69120 Heidelberg, Germany

[8] GMTO Corp, Pasadena, CA 91101 USA

[9] Univ Durham, Dept Phys, Durham DH1 3LE, England

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 813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：

galaxies: dwarf; Galaxy: structure; globular clusters: general; Local Group; DIGITAL SKY SURVEY; ULTRA-FAINT SATELLITES; GLOBULAR-CLUSTER; DWARF GALAXIES; OUTER HALO; LEO V; SPECTROSCOPIC SURVEY; GALACTIC SATELLITES; LUMINOSITY FUNCTION; CANES VENATICI;

D O I：

10.1088/0004-637X/813/1/44

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discovery of three new Milky Way satellites from our search for compact stellar overdensities in the photometric catalog of the Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS 1, or PS1) 3 pi survey. The first satellite, Laevens 3, is located at a heliocentric distance of d = 67 +/- 3 kpc. With a total magnitude of M-V = -4.4 +/- 0.3 and a half-light radius of r(h) = 7 +/- 2 pc, its properties resemble those of outer halo globular clusters. The second system, Draco II/Laevens 4, is a closer and fainter satellite (d similar to 20 kpc, M-V = -2.9 +/- 0.8), whose uncertain size (r(h) = 19(-6)(+8) pc) renders its classification difficult without kinematic information; it could either be a faint and extended globular cluster or a faint and compact dwarf galaxy. The third satellite, Sagittarius II/Laevens 5 (Sgr II), has an ambiguous nature, as it is either the most compact dwarf galaxy or the most extended globular cluster in its luminosity range (r(h) 37(-8)(+9) pc and M-V = -5.2 +/- 0.4). At a heliocentric distance of 67 +/- 5 kpc, this satellite lies intriguingly close to the expected location of the trailing arm of the Sagittarius stellar stream behind the Sagittarius dwarf spheroidal galaxy (Sgr dSph). If confirmed through spectroscopic follow up, this connection would locate this part of the trailing arm of the Sagittarius stellar stream that has so far gone undetected. It would further suggest that Sgr II was brought into the Milky Way halo as a satellite of the Sgr dSph.

引用

页数：9

共 65 条

[1] A NEW MILKY WAY HALO STAR CLUSTER IN THE SOUTHERN GALACTIC SKY [J].

Balbinot, E. ;

Santiago, B. X. ;

da Costa, L. ;

Maia, M. A. G. ;

Majewski, S. R. ;

Nidever, D. ;

Rocha-Pinto, H. J. ;

Thomas, D. ;

Wechsler, R. H. ;

Yanny, B. .

ASTROPHYSICAL JOURNAL, 2013, 767 (02)

[2] 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)

[3] LEO V: A COMPANION OF A COMPANION OF THE MILKY WAY GALAXY? [J].

Belokurov, V. ;

Walker, M. G. ;

Evans, N. W. ;

Faria, D. C. ;

Gilmore, G. ;

Irwin, M. J. ;

Koposov, S. ;

Mateo, M. ;

Olszewski, E. ;

Zucker, D. B. .

ASTROPHYSICAL JOURNAL LETTERS, 2008, 686 (02) :L83-L86

[4] Cats and dogs, hair and a hero: A quintet of new Milky Way companions [J].

Belokurov, V. ;

Zucker, D. B. ;

Evans, N. W. ;

Kleyna, J. T. ;

Koposov, S. ;

Hodgkin, S. T. ;

Irwin, M. J. ;

Gilmore, G. ;

Wilkinson, M. I. ;

Fellhauer, M. ;

Bramich, D. M. ;

Hewett, P. C. ;

Vidrih, S. ;

De Jong, J. T. A. ;

Smith, J. A. ;

Rix, H. -W. ;

Bell, E. F. ;

Wyse, R. F. G. ;

Newberg, H. J. ;

Mayeur, P. A. ;

Yanny, B. ;

Rockosi, C. M. ;

Gnedin, O. Y. ;

Schneider, D. P. ;

Beers, T. C. ;

Barentine, J. C. ;

Brewington, H. ;

Brinkmann, J. ;

Harvanek, M. ;

Kleinman, S. J. ;

Krzesinski, J. ;

Long, D. ;

Nitta, A. ;

Snedden, S. A. .

ASTROPHYSICAL JOURNAL, 2007, 654 (02) :897-906

[5] The field of streams: Sagittarius and its siblings [J].

Belokurov, V. ;

Zucker, D. B. ;

Evans, N. W. ;

Gilmore, G. ;

Vidrih, S. ;

Bramich, D. M. ;

Newberg, H. J. ;

Wyse, R. F. G. ;

Irwin, M. J. ;

Fellhauer, M. ;

Hewett, P. C. ;

Walton, N. A. ;

Wilkinson, M. I. ;

Cole, N. ;

Yanny, B. ;

Rockosi, C. M. ;

Beers, T. C. ;

Bell, E. F. ;

Brinkmann, J. ;

Ivezic, Z. . ;

Lupton, R. .

ASTROPHYSICAL JOURNAL, 2006, 642 (02) :L137-L140

[6] ATLAS lifts the Cup: discovery of a new Milky Way satellite in Crater [J].

Belokurov, V. ;

Irwin, M. J. ;

Koposov, S. E. ;

Evans, N. W. ;

Gonzalez-Solares, E. ;

Metcalfe, N. ;

Shanks, T. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 441 (03) :2124-2133

[7] BIG FISH, LITTLE FISH: TWO NEW ULTRA-FAINT SATELLITES OF THE MILKY WAY [J].

Belokurov, V. ;

Walker, M. G. ;

Evans, N. W. ;

Gilmore, G. ;

Irwin, M. J. ;

Just, D. ;

Koposov, S. ;

Mateo, M. ;

Olszewski, E. ;

Watkins, L. ;

Wyrzykowski, L. .

ASTROPHYSICAL JOURNAL LETTERS, 2010, 712 (01) :L103-L106

[8] Galactic globular and open cluster fiducial sequences in the Pan-STARRS1 photometric system [J].

Bernard, Edouard J. ;

Ferguson, Annette M. N. ;

Schlafly, Edward F. ;

Platais, Imants ;

Bell, Eric F. ;

Martin, Nicolas F. ;

Rix, Hans-Walter ;

Slater, Colin T. ;

Burgett, William S. ;

Chambers, Kenneth C. ;

Draper, Peter W. ;

Hodapp, Klaus W. ;

Kaiser, Nicholas ;

Kudritzki, Rolf-Peter ;

Magnier, Eugene A. ;

Metcalfe, Nigel ;

Tonry, John L. ;

Wainscoat, Richard J. ;

Waters, Christopher .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 442 (04) :2999-3009

[9] parsec: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code [J].

Bressan, Alessandro ;

Marigo, Paola ;

Girardi, Leo ;

Salasnich, Bernardo ;

Dal Cero, Claudia ;

Rubele, Stefano ;

Nanni, Ambra .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2012, 427 (01) :127-145

[10] STEALTH GALAXIES IN THE HALO OF THE MILKY WAY [J].

Bullock, James S. ;

Stewart, Kyle R. ;

Kaplinghat, Manoj ;

Tollerud, Erik J. ;

Wolf, Joe .

ASTROPHYSICAL JOURNAL, 2010, 717 (02) :1043-1053

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