Data Processing of MIPSGAL 70 Micron Images

Details Data Processing of MIPSGAL 70 Micron Images Data Processing of MIPSGAL 70 Micron Images

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8804p&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #88.04; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe the modifications and enhancements that we have made to the standard SSC pipeline produced, 70 micron basic calibrated data (BCDs) for the MIPSGAL survey. The high background levels and large number of saturating sources in the observed portion of the Galactic plane create large variations in the responsivity of the Ge:Ga detectors used in the MIPS instrument. We detail how we reprocess the stimulator solutions using the GeRT software provided by the MIPS instrument team. The stim-corrected data have then a delta flat field applied to correct for short term responsivity variations. We explore several methods of destriping the data on a scan to scan level. A globally derived gain correction appears to be the best solution although a wavelet based destriper also retrieves good results. The photometry is checked by comparing the resulting mosaic images to IRIS reprocessed 60 micron data (Miville-Deschenes & Lagache 2005; ApJSS, 157, 302). Over most of the dynamic range of the data, the color-corrected MIPSGAL data agrees to 10% with IRIS. For the brightest regions, the values can be descrepant by 30% with a substantial fraction of the discrepancy due to the uncertainty in the color correction applied.
This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.

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