STAR FORMATION HISTORY IN TWO FIELDS OF THE SMALL MAGELLANIC CLOUD BAR

被引：29
作者：
Cignoni, M. [1 ,2 ]
Cole, A. A. [3 ]
Tosi, M. [2 ]
Gallagher, J. S. [4 ]
Sabbi, E. [5 ]
Anderson, J. [5 ]
Grebel, E. K. [6 ]
Nota, A. [5 ]
机构：
[1] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy
[2] Osservatorio Astron Bologna, Ist Nazl Astrofis, I-40127 Bologna, Italy
[3] Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia
[4] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[5] STScI, Baltimore, MD 21218 USA
[6] Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, D-69120 Heidelberg, Germany
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 754卷 / 02期
关键词：
galaxies: evolution; galaxies: formation; galaxies: individual (Small Magellanic Cloud); galaxies: interactions; galaxies: photometry; galaxies: star formation; galaxies: stellar content; galaxies: structure; stars: massive; II TRIPLET SPECTROSCOPY; GRAVITATIONAL LENSING EXPERIMENT; SPACE-TELESCOPE/ADVANCED CAMERA; AGE-METALLICITY RELATIONSHIP; SEQUENCE TURNOFF PHOTOMETRY; INITIAL MASS FUNCTION; INTERMEDIATE-AGE; STELLAR POPULATIONS; SOLAR NEIGHBORHOOD; LOCAL GROUP;
D O I：
10.1088/0004-637X/754/2/130
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Bar is the most productive region of the Small Magellanic Cloud in terms of star formation but also the least studied one. In this paper, we investigate the star formation history of two fields located in the SW and in the NE portion of the Bar using two independent and well-tested procedures applied to the color-magnitude diagrams of their stellar populations resolved by means of deep Hubble Space Telescope photometry. We find that the Bar experienced a negligible star formation activity in the first few Gyr, followed by a dramatic enhancement from 6 to 4 Gyr ago and a nearly constant activity since then. The two examined fields differ both in the rate of star formation and in the ratio of recent over past activity, but share the very low level of initial activity and its sudden increase around 5 Gyr ago. The striking similarity between the timing of the enhancement and the timing of the major episode in the Large Magellanic Cloud is suggestive of a close encounter triggering star formation.
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页数：17
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