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We present a comprehensive analysis of structure in the young, embeddedcluster, NGC 1333 using members identified with Spitzer and 2MASS photometrybased on their IR-excess emission. In total, 137 members are identified in thisway, composed of 39 protostars and 98 more evolved pre-main sequence stars withdisks. Of the latter class, four are transition/debris disk candidates. Thefraction of exposed pre-main sequence stars with disks is 83% +/- 11%, showingthat there is a measurable diskless pre-main sequence population. The sourcesin each of the Class I and Class II evolutionary states are shown to have verydifferent spatial distributions relative to the distribution of the dense gasin their natal cloud. However, the distribution of nearest neighbor spacingsamong these two groups of sources are found to be quite similar, with a strongpeak at spacings of 0.045 pc. Radial and azimuthal density profiles and surfacedensity maps computed from the identified YSOs show that NGC 1333 is elongatedand not strongly centrally concentrated, confirming previous claims in theliterature. We interpret these new results as signs of a low velocitydispersion, extremely young cluster that is not in virial equilibrium.

Spitzer Observations of NGC 1333: A Study of Structure and Evolution in a Nearby Embedded Cluster