J/ApJ/685/1005       Spitzer and high-mass star forming regions     (Qiu+, 2008)
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Beginning of ReadMe : J/ApJ/685/1005 Spitzer and high-mass star forming regions (Qiu+, 2008) ================================================================================ Spitzer IRAC and MIPS imaging of clusters and outflows in nine high-mass star forming regions. Qiu K., Zhang Q., Megeath S.T., Gutermuth R.A., Beuther H., Shepherd D.S., Sridharan T.K., Testi L., De Pree C.G. <Astrophys. J., 685, 1005-1025 (2008)> =2008ApJ...685.1005Q ================================================================================ ADC_Keywords: Photometry, infrared ; YSOs ; H II regions Keywords: infrared: stars - ISM: jets and outflows - reflection nebulae - stars: formation - stars: pre-main sequence Abstract: We present Spitzer Space Telescope IRAC and MIPS observations toward a sample of nine high-mass star forming regions at a distance of around 2kpc. Based on IRAC and MIPS 24um photometric results and 2MASS JHKs data, we carry out a census of young stellar objects (YSOs) in a 5'x5' field toward each region. Toward seven out of the nine regions, we detect parsec-sized clusters with around 20 YSOs surrounded by a more extended and sparse distribution of young stars and protostars. For the other two regions, IRAS 20126+4104 and IRAS 22172+5549, the former has the lowest number of YSOs in the sample and shows no obvious cluster, and the latter appears to be part of a larger, potentially more evolved cluster. Description: The IRAC observations were obtained from 2005 February to September except IRAS 19410+2336, which was observed in 2004 October. The MIPS observations were undertaken in the photometry mode during campaigns separated by less than 1 month from the IRAC observations with the exception of IRAS 22172+5549 (1.5 months' separation) and HH 80-81 (5 months' separation).