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We present the initial results from the Spitzer Survey of the SmallMagellanic Cloud (S3MC), which imaged the star-forming body of the SmallMagellanic Cloud (SMC) in all seven MIPS and IRAC wavebands. We find that theF_8/F_24 ratio (an estimate of PAH abundance) has large spatial variations andtakes a wide range of values that are unrelated to metallicity butanticorrelated with 24 um brightness and F_24/F_70 ratio. This suggests thatphotodestruction is primarily responsible for the low abundance of PAHsobserved in star-forming low-metallicity galaxies. We use the S3MC images tocompile a photometric catalog of ~400,000 mid- and far-infrared point sourcesin the SMC. The sources detected at the longest wavelengths fall into four maincategories: 1) bright 5.8 um sources with very faint optical counterparts andvery 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 colorsand bright optical counterparts, corresponding to oxygen-rich evolved stars.And, 4) unreddened early B stars (B3 to O9) with a large 24 um excess. Thisexcess is reminiscent of debris disks, and is detected in only a small fractionof these stars (<5%). The majority of the brightest infrared point sources inthe SMC fall into groups one to three. We use this photometric information toproduce a catalog of 282 bright YSOs in the SMC with a very low level ofcontamination (~7%).

TheSpitzerSurvey of the Small Magellanic Cloud: S3MC Imaging and Photometry in the Mid‐ and Far‐Infrared Wave Bands

TheSpitzerSurvey of the Small Magellanic Cloud: S³MC Imaging and Photometry in the Mid‐ and Far‐Infrared Wave Bands