SPITZER VIEW OF MASSIVE STAR FORMATION IN THE TIDALLY STRIPPED MAGELLANIC BRIDGE

被引:13
作者
Chen, C. -H. Rosie [1 ]
Indebetouw, Remy [1 ,2 ]
Muller, Erik [3 ,4 ]
Kawamura, Akiko [3 ,4 ]
Gordon, Karl D. [5 ]
Sewilo, Marta [6 ]
Whitney, Barbara A. [7 ]
Fukui, Yasuo
Madden, Suzanne C. [8 ]
Meade, Marilyn R. [7 ]
Meixner, Margaret [5 ]
Oliveira, Joana M. [9 ]
Robitaille, Thomas P. [10 ]
Seale, Jonathan P. [5 ,6 ]
Shiao, Bernie [5 ]
van Loon, Jacco Th [9 ]
机构
[1] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA
[2] Natl Radio Astron Observ, Charlottesville, VA 22903 USA
[3] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
[4] Nagoya Univ, Dept Astrophys, Chikusa Ku, Nagoya, Aichi 4648602, Japan
[5] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[6] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[7] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[8] CEA, Irfu SAp, Lab AIM, F-91191 Gif Sur Yvette, France
[9] Keele Univ, Lennard Jones Labs, Astrophys Grp, Keele ST5 5BG, Staffs, England
[10] Max Planck Inst Astron, D-69117 Heidelberg, Germany
基金
美国国家科学基金会; 欧洲研究理事会;
关键词
infrared: stars; Magellanic Clouds; stars: formation; stars: pre-main sequence; YOUNG STELLAR OBJECTS; SPECTRAL ENERGY-DISTRIBUTIONS; HERBIG-AE/BE STARS; SUPERCOSMOS SKY SURVEY; LOW-METALLICITY; GALAXY EVOLUTION; INFRARED-EMISSION; MOLECULAR CLOUDS; H-ALPHA; INTERSTELLAR DUST;
D O I
10.1088/0004-637X/785/2/162
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Magellanic Bridge is the nearest low-metallicity, tidally stripped environment, offering a unique high-resolution view of physical conditions in merging and forming galaxies. In this paper, we present an analysis of candidate massive young stellar objects (YSOs), i.e., in situ, current massive star formation (MSF) in the Bridge using Spitzer mid-IR and complementary optical and near-IR photometry. While we definitely find YSOs in the Bridge, the most massive are similar to 10M(circle dot), << 45M(circle dot) found in the LMC. The intensity of MSF in the Bridge also appears to be decreasing, as the most massive YSOs are less massive than those formed in the past. To investigate environmental effects on MSF, we have compared properties of massive YSOs in the Bridge to those in the LMC. First, YSOs in the Bridge are apparently less embedded than in the LMC: 81% of Bridge YSOs show optical counterparts, compared to only 56% of LMC sources with the same range of mass, circumstellar dust mass, and line-of-sight extinction. Circumstellar envelopes are evidently more porous or clumpy in the Bridge's low-metallicity environment. Second, we have used whole samples of YSOs in the LMC and the Bridge to estimate the probability of finding YSOs at a given Hi column density, N(H I). We found that the LMC has similar to 3x higher probability than the Bridge for N(H I) > 12x10(20) cm(-2), but the trend reverses at lower N(H I). Investigating whether this lower efficiency relative to Hi is due to less efficient molecular cloud formation or to less efficient cloud collapse, or to both, will require sensitive molecular gas observations.
引用
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页数:29
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