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J/ApJ/752/127           IR observations of AFGL 490           (Masiunas+, 2012)
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Beginning of ReadMe : J/ApJ/752/127 IR observations of AFGL 490 (Masiunas+, 2012) ================================================================================ A structural analysis of star-forming region AFGL 490. Masiunas L.C., Gutermuth R.A., Pipher J.L., Megeath S.T., Myers P.C., Allen L.E., Kirk H.M., Fazio G.G. <Astrophys. J., 752, 127 (2012)> =2012ApJ...752..127M ================================================================================ ADC_Keywords: Photometry, infrared ; YSOs ; Associations, stellar Keywords: infrared: stars; stars: formation; stars: pre-main sequence Abstract: We present Spitzer IRAC and MIPS observations of the star-forming region containing intermediate-mass young stellar object (YSO) AFGL 490. We supplement these data with near-IR Two Micron All Sky Survey photometry and with deep Simultaneous Quad Infrared Imaging Device observations off the central high-extinction region. We have more than doubled the known membership of this region to 57 Class I and 303 Class II YSOs via the combined 1-24mum photometric catalog derived from these data. We construct and analyze the minimum spanning tree of their projected positions, isolating one locally overdense cluster core containing 219 YSOs (60.8% of the region's members). We find this cluster core to be larger yet less dense than similarly analyzed clusters. Although the structure of this cluster core appears irregular, we demonstrate that the parsec-scale surface densities of both YSOs and gas are correlated with a power-law slope of 2.8, as found for other similarly analyzed nearby molecular clouds. We also explore the mass segregation implications of AFGL 490's offset from the center of its core, finding that it has no apparent preferential central position relative to the low-mass members. Description: AFGL 490 was initially observed using Spitzer Space Telescope's IRAC instrument at 3.6, 4.5, 5.8, and 8.0um on 2004 October 8 (AOR ID 3654656, centered on right ascension 03:27:38.60 and declination +58:46:57.7, J2000) as part of the Guaranteed Time Observation PID 6, "Structure and Incidence of Young Embedded Clusters." These data were analyzed and presented by Gutermuth et al. (2009, Cat. J/ApJS/184/18). The IRAC view of the region was expanded to 0.51deg^2^ as part of the GTO "Clusters Near Clusters" program (PID 40147). Initial 24um MIPS images for PID 6 were obtained on 2004 September 24 (AOR ID 3663104, centered on right ascension 03:28:31.6 and declination +58:25:37, J2000.0). The field of view was expanded on 2007 October 23 (AOR ID 21894144) as part of PID 40147. MIPS data cover 0.38deg^2^. Near-infrared imaging in J, H, and KS bands was obtained using the Simultaneous Quad Infrared Imaging Device (SQIID) on Kitt Peak National Observatory's 2.1m telescope on 2003 November 8. The final mosaics have a mean integration time per position of 240s, and cover 0.05deg^2^, with an FWHM of 2.6, 2.5, and 2.6 pixels for J, H, and KS bands, respectively. The final merged source catalog includes data in J, H, and KS bands from 2MASS and SQIID; 3.6, 4.5, 5.8, and 8.0um from IRAC; and 24um from MIPS.