Remnants of the Sagittarius dwarf spheroidal galaxy around the young globular cluster Palomar 12

被引：51

作者：

Martínez-Delgado, D

Zinn, R

Carrera, R

Gallart, C

机构：

[1] Inst Astrofis Canarias, E-38200 Tenerife, Spain

[2] Yale Univ, Dept Astron, New Haven, CT 06520 USA

来源：

ASTROPHYSICAL JOURNAL | 2002年 / 573卷 / 01期

基金：

美国国家科学基金会;

关键词：

galaxies : individual (Sagittarius); Galaxy : formation; Galaxy : halo; Galaxy : structure; globular clusters : individual (Palomar 12);

D O I：

10.1086/341970

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Photometry of a large field around the young globular cluster Palomar 12 has revealed the main sequence of a low surface brightness stellar system. This main sequence is indicative of a stellar population that varies significantly in metallicity and/or age but in the mean is more metal-poor than Pal 12. Under different assumptions for the properties of this population, we find distances from the Sun in the range 17-24 kpc, which encompasses the distance to Pal 12, 19.0 +/- 0.9 kpc. The stellar system is also detected in a field 2degrees north of Pal 12, which indicates it has a minimum diameter of similar to0.9 kpc. The orbit of Pal 12, the color-magnitude diagram of the stellar system, their positions on the sky, and their distances suggest that they are debris from the tidal disruption of the Sagittarius dwarf spheroidal galaxy. We discuss briefly the implications for the evolution of Sgr and the Galactic halo.

引用

页码：L19 / L22

页数：4

共 35 条

[31] THE CENTER OF THE CORE CUSP GLOBULAR CLUSTER-M15 - CFHT AND HST OBSERVATIONS, ALLFRAME REDUCTIONS [J].

STETSON, PB .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1994, 106 (697) :250-280

[32] Young globular clusters and dwarf spheroidals [J].

van den Bergh, S .

ASTROPHYSICAL JOURNAL, 2000, 530 (02) :777-782

[33] The quest RR Lyrae survey:: Confirmation of the clump at 50 kiloparsecs and other overdensities in the outer halo [J].

Vivas, AK ;

Zinn, R ;

Andrews, P ;

Bailyn, C ;

Baltay, C ;

Coppi, P ;

Ellman, N ;

Girard, T ;

Rabinowitz, D ;

Schaefer, B ;

Shin, J ;

Snyder, J ;

Sofia, S ;

van Altena, W ;

Abad, C ;

Bongiovanni, A ;

Briceño, C ;

Bruzual, G ;

Della Prugna, F ;

Herrera, D ;

Magris, G ;

Mateu, J ;

Pacheco, R ;

Sánchez, G ;

Schenner, H ;

Stock, J ;

Vicente, E ;

Vieira, K ;

Ferrín, I ;

Hernandez, J ;

Gebhard, M ;

Honeycutt, R ;

Mufson, S ;

Musser, J ;

Rengstorf, A .

ASTROPHYSICAL JOURNAL, 2001, 554 (01) :L33-L36

[34] Identification of A-colored stars and structure in the halo of the milky way from Sloan Digital Sky Survey commissioning data [J].

Yanny, B ;

Newberg, HJ ;

Kent, S ;

Laurent-Muehleisen, SA ;

Pier, JR ;

Richards, GT ;

Stoughton, C ;

Anderson, JE ;

Annis, J ;

Brinkmann, J ;

Chen, B ;

Csabai, I ;

Doi, M ;

Fukugita, M ;

Hennessy, GS ;

Ivezic, Z ;

Knapp, GR ;

Lupton, R ;

Munn, JA ;

Nash, T ;

Rockosi, CM ;

Schneider, DP ;

Smith, JA ;

York, DG .

ASTROPHYSICAL JOURNAL, 2000, 540 (02) :825-841

[35]

ZINN R, 1993, ASTR SOC P, V48, P38

← 1 2 3 4 →