The Spitzer SAGE Survey of the Large Magellanic Cloud: Characteristics of the Epoch 1 IRAC and MIPS-24 Source Lists

Details The Spitzer SAGE Survey of the Large Magellanic Cloud: Characteristics of the Epoch 1 IRAC and MIPS-24 Source Lists The Spitzer SAGE Survey of the Large Magellanic Cloud: Characteristics of the Epoch 1 IRAC and MIPS-24 Source Lists

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916014m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #160.14; Bulletin of the American Astronomical Society,

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We present the characteristics of the Epoch 1 IRAC and MIPS 24 micron source lists from the Spitzer SAGE survey of the Large Magellanic Cloud (LMC) that involved two epoch of observations separated by 3 months. The IRAC source lists include photometry of the IRAC 3.6, 4.5, 5.8 and 8.0 micron bandpaases that have been band merged with the corresponding 2MASS photometry. The MIPS 24 micron list is a separate list of the 24 micron photometry values. Photometry is listed as Vega magnitudes and in milli-Jy for both lists. The criteria for inclusion in the source lists ensures a high level of reliability. We describe the basic properties of the source lists including: astrometric accuracy, precision of photometry, accuracy of the photometry and an estimate of completeness based on comparison with deeper exposures. The Epoch 1 IRAC processing performed single frame photometry using a modified version of DAOPHot on both the 0.6 and 12 second exposures taking into account cosmic ray and artifact corrections. The point source selection criteria, requiring multiple detections across wavelength bands, mitigates the effects of cosmic rays and other artifacts. The Epoch 1 IRAC catalog has 4 million point sources. The MIPS Epoch 1 data processing is performed on mosaciked images using StarFinder with a criteria of at least 10 sigma and a confirmation of the source in the draft Epoch 2 source list. The Epoch 1 MIPS 24 micron catalog has 60,000 sources. Future catalog releases will involve photometry on mosaicked images and will be deeper and more complete. We compare the IRAC, MIPS 24 micron and 2MASS photometry. We find that the SAGE catalog is much deeper than 2MASS and many of the fainter, redder sources have no 2MASS counterparts.

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