Fig. 16
Spatial distributions of different classes of YSOs. Various symbols are overlaid on the WISE 4.6 μm image. The filled square symbols represent X-ray identified sources (XMM-Newton bigger green, Chandra sources small blue). Open magenta squares, open red triangles, filled magenta circles, and open green circles are Spitzer-identified YSOs, CTTSs, Hα emission stars, and probable NIR-excess YSOs, respectively. Purple star symbols are Herschel YSO sources. The abscissae and the ordinates represent RA and Dec, respectively for the J2000 epoch.
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