期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 714, 期 2, 页码 L285-L289出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/714/2/L285
关键词
circumstellar matter; ISM: clouds; stars: formation; stars: luminosity function, mass function
资金
- NSF [AST-0901646, AST-0507164]
- Spitzer GLIMPSE programs
- Spitzer Theory Program
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0901646] Funding Source: National Science Foundation
Through analysis of archival images and photometry from the Spitzer GLIMPSE and MIPSGAL surveys combined with Two Micron All Sky Survey and MSX data, we have identified 488 candidate young stellar objects (YSOs) in the giant molecular cloud M17 SWex, which extends similar to 50 pc southwest from the prominent Galactic H II region M17. Our sample includes >200 YSOs with masses >3 M-circle dot that will become B-type stars on the main sequence. Extrapolating over the stellar initial mass function (IMF), we find that M17 SWex contains >1.3 x 10(4) young stars, representing a proto-OB association. The YSO mass function is significantly steeper than the Salpeter IMF, and early O stars are conspicuously absent from M17 SWex. Assuming M17 SWex will form an OB association with a Salpeter IMF, these results reveal the combined effects of (1) more rapid circumstellar disk evolution in more massive YSOs and (2) delayed onset of massive star formation.
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