/ftp/cats/aliases/K/./KAG2008



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J/ApJ/688/1142    Star formation in W5: Spitzer observations     (Koenig+, 2008)
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Beginning of ReadMe : J/ApJ/688/1142 Star formation in W5: Spitzer observations (Koenig+, 2008) ================================================================================ Clustered and triggered star formation in W5: observations with Spitzer. Koenig X.P., Allen L.E., Gutermuth R.A., Hora J.L., Brunt C.M., Muzerolle J. <Astrophys. J., 688, 1142-1158 (2008)> =2008ApJ...688.1142K ================================================================================ ADC_Keywords: H II regions ; Photometry, infrared ; Stars, pre-main sequence ; Active gal. nuclei Keywords: H II regions - infrared: stars - ISM: globules - stars: early-type - stars: formation - stars: pre-main sequence Abstract: We present images and initial results from our extensive Spitzer Space Telescope imaging survey of the W5 HII region with the Infrared Array Camera (IRAC) and Multiband Imaging Photometer for Spitzer (MIPS). We detect dense clusters of stars, centered on the O stars HD 18326, BD +60 586, HD 17505, and HD 17520. At 24um, substantial extended emission is visible, presumably from heated dust grains that survive in the strongly ionizing environment of the HII region. With photometry of more than 18000 point sources, we analyze the clustering properties of objects classified as young stars by their IR spectral energy distributions (a total of 2064 sources) across the region using a minimal-spanning-tree algorithm. We find  40%-70% of infrared excess sources belong to clusters with >=10 members. We find that within the evacuated cavities of the HII regions that make up W5, the ratio of Class II to Class I sources is  7 times higher than for objects coincident with molecular gas as traced by ^12^CO emission and near-IR extinction maps. We attribute this contrast to an age difference between the two locations and postulate that at least two distinct generations of star formation are visible across W5. Our preliminary analysis shows that triggering is a plausible mechanism to explain the multiple generations of star formation in W5 and merits further investigation. Description: W5 was observed with the Spitzer IRAC instrument in all four bands (3.6, 4.5, 5.8, and 8.0um). The observations were broken down into three rectangular Astronomical Observing Requests (AORs) covering  1.8x1.6deg, in 2006 Sep 20,28 and 2007 Feb 16.