The Structure of the Large Young Cluster CepOB3b

Mathematics – Probability

Scientific paper

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Scientific paper

We have conducted a detailed characterization of the structure of the CepOB3b young cluster using membership lists derived from space-based (Spitzer mid-IR and Chandra Xray) and ground-based (NEWFIRM near-IR) imaging. We currently estimate the CepOB3b cluster membership at roughly 2500 members; at a distance of 700 pc, CepOB3b is the second nearest large (>1000 members) young cluster after the Orion Nebula Cluster. Recent examination of the Spitzer-identified YSOs has revealed that the Cep B cluster (CepOB3b East) is significantly extended to the west, including a second overdense cluster core (CepOB3b West) near the Cep F molecular cloud core. We present radial and azimuthal surface density profiles of both cluster cores using the improved member list. We also examine the density contrast between the two cores, the intra-core region, and the exterior of the cluster, in order to constrain the probability that the cluster cores are either physically associated or spatially distinct structures that are associated only by projection.

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