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We have performed a WISE (Wide-Field Infrared Survey Explorer) based study toidentify and characterize young stellar objects (YSOs) in 12x12 degree PerseusOB2 association. Spectral energy distribution (SED) slope in range of 3.4-12micron and a 5sigma selection criteria were used to select our initial sample.Further manual inspection reduced our final catalog to 156 known and 119 YSOcandidate. The spatial distribution of newly found YSOs all over the fieldshows an older generation of star formation which most of its massive membershave evolved into main sequence stars. In contrast, the majority of youngermembers lie within the Perseus molecular cloud and currently active starforming clusters such as NGC1333 and IC348. We also identified additional 66point sources which passed YSO selection criteria but are likely AGB stars.However their spatial distribution suggests that they may contain a fraction ofthe YSOs. Comparing our results with the commonly used color-color selections,we found that while color selection method fails in picking up bright butevolved weak disks, our SED fitting method can identify such sources, includingtransitional disks. In addition we have less contamination with backgroundsources such as galaxies, but in a price of loosing fainter (Jmag > 12) YSOs.Finally we employed a Bayesian Monte Carlo SED fitting method to determine thecharacteristics of each YSO candidate. Distribution of SED slopes and modeldriven age and mass confirms separated YSO populations with suggested three agegroups of younger than 1 Myr old, 1-5 Myr old, and older than 5 Myrs whichagrees with the age of Per OB2 association and currently star forming siteswithin the cloud.

A WISE Census of Young Stellar Objects in Perseus OB2 Association