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Active star forming regions are excellent laboratories for studying theorigins and evolution of young stellar object (YSO) clustering. The W40 -Serpens South region is such a region, and we compile a supernear-and-mid-infrared catalog of point sources in it, based on deep NIRobservations of CFHT in combination with 2MASS, UKIDSS, and Spitzer catalogs.From this catalog, we identify 832 YSOs, and classify 15, 135, 647, and 35 ofthem to be the deeply embedded sources, Class I, Class II YSOs, and transitiondisk sources, respectively. In general, these YSOs are well correlated with thefilamentary structures of molecular clouds, especially the deeply embeddedsources and the Class I YSOs. The W40 central region is dominated by Class IIYSOs, but in the Serpens South region, a half of the YSOs are Class I. Wefurther generate a minimum spanning tree (MST) for all the YSOs. Around the W40cluster, there are eight prominent MST branches that may trace vestigialmolecular gas filaments that once fed gas to the central natal gas clump. Ofthe eight, only two now include detectable filamentary gas in Herschel data andcorresponding Class I YSOs, while the other six are exclusively populated withClass II. Four MST branches overlap with the Serpens South main filament, andwhere they intersect, molecular gas "hubs" and more Class I YSOs are found. Ourresults imply a mixture of YSO distributions composed of both primordial andsomewhat evolved YSOs in this star forming region.

Deep Near-Infrared Survey Toward the W40 and Serpens South Region in Aquila Rift: A Comprehensive Catalog of Young Stellar Objects