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We present 737 candidate Young Stellar Objects (YSOs) near the W51 GiantMolecular Cloud (GMC) over an area of 1.25 deg x 1.00 deg selected from SpitzerSpace Telescope data. We use spectral energy distribution (SED) fits toidentify YSOs and distinguish them from main-sequence or red giant stars,asymptotic giant branch stars, and background galaxies. Based on extinction ofeach YSO, we separate a total of 437 YSOs associated with the W51 region fromthe possible foreground sources. We identify 69 highly embedded Stage 0/Icandidate YSOs in our field with masses > 5 Msun (corresponding to mid-toearly-B main-sequence spectral types) 46 of which are located in the centralactive star forming regions of W51A and W51B. From the YSOs associated withW51, we find evidence for mass segregation showing that the most massive YSOsare concentrated on the W51 HII region complex. We find a variation in thespatial distribution of the mass function (MF) of YSOs in the mass rangebetween 5 Msun and 18 Msun. The derived slopes of the MF are -1.26 and -2.36 inthe active star-forming region and the outer region, respectively. Thevariation of the MF for YSOs embedded in the molecular cloud implies that thedistribution of stellar masses in clusters depends on the local conditions inthe parent molecular cloud.

Embedded Young Stellar Object Candidates in the Active Star Forming Complex W51: Mass Function and Spatial Distribution