The JCMT Gould Belt Survey: Dense Core Clusters in Orion B

TL;DR

This study analyzes the clustering and mass distribution of dense cores in Orion B using JCMT data, revealing early signs of mass segregation within core clusters.

Contribution

It introduces a detailed analysis of dense core clustering and mass segregation in Orion B, utilizing novel techniques like minimal spanning trees and M-Sigma correlation.

Findings

Dense cores form clustered structures in Orion B regions.

Massive cores tend to be centrally located within clusters.

Evidence suggests mass segregation occurs at the dense core stage.

Abstract

The JCMT Gould Belt Legacy Survey obtained SCUBA-2 observations of dense cores within three sub-regions of Orion B: LDN 1622, NGC 2023/2024, and NGC 2068/2071, all of which contain clusters of cores. We present an analysis of the clustering properties of these cores, including the two-point correlation function and Cartwright's Q parameter. We identify individual clusters of dense cores across all three regions using a minimal spanning tree technique, and find that in each cluster, the most massive cores tend to be centrally located. We also apply the independent M-Sigma technique and find a strong correlation between core mass and the local surface density of cores. These two lines of evidence jointly suggest that some amount of mass segregation in clusters has happened already at the dense core stage.