Astrophys. J., 655, 212-232 (2007/January-3)
The Spitzer Survey of the Small Magellanic Cloud: S3MC imaging and photometry in the mid- and far-infrared wave bands.
BOLATTO A.D., SIMON J.D., STANIMIROVIC S., VAN LOON J.T., SHAH R.Y., VENN K., LEROY A.K., SANDSTROM K., JACKSON J.M., ISRAEL F.P., LI A., STAVELEY-SMITH L., BOT C., BOULANGER F. and RUBIO M.
Abstract (from CDS):
We present the initial results from the Spitzer Survey of the Small Magellanic Cloud (S3MC), which imaged the star-forming body of the SMC in all seven MIPS and IRAC wave bands. We find that the F8/F24ratio (an estimate of PAH abundance) has large spatial variations and takes a wide range of values that are unrelated to metallicity but anticorrelated with 24 µm brightness and F24/F70ratio. This suggests that photodestruction is primarily responsible for the low abundance of PAHs observed in star-forming low-metallicity galaxies. We use the S3MC images to compile a photometric catalog of ∼400,000 mid- and far-infrared point sources in the SMC. The sources detected at the longest wavelengths fall into four main categories: (1) bright 5.8 µm sources with very faint optical counterparts and very red mid-infrared colors ([5.8]-[8.0]>1.2), which we identify as YSOs; (2) bright mid-infrared sources with mildly red colors (0.16≲[5.8]-[8.0]<0.6), identified as carbon stars; (3) bright mid-infrared sources with neutral colors and bright optical counterparts, corresponding to oxygen-rich evolved stars; and (4) unreddened early B stars (B3-O9) with a large 24 µm excess. This excess is reminiscent of debris disks and is detected in only a small fraction of these stars (≲5%). The majority of the brightest infrared point sources in the SMC fall into groups 1-3. We use this photometric information to produce a catalog of 282 bright YSOs in the SMC with a very low level of contamination (∼7%).
ISM: Dust, Extinction - Galaxies: Dwarf - Galaxies: Stellar Content - Infrared: ISM - Infrared: Stars - Galaxies: Magellanic Clouds
VizieR on-line data:
<Available at CDS (J/ApJ/655/212): table4.dat>
Table 4, col.(1): [BSS2007] NNN (Nos 1-282) = S3MC JHHMMSS.ss+DDMMSS.ss N=282.
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