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Source clustering in the Hi-GAL survey determined using a minimum spanning tree method

Beuret, M, Billot, N, Cambresy, L, Eden, DJ, Elia, D, Molinari, S, Pezzuto, S and Schisano, E (2017) Source clustering in the Hi-GAL survey determined using a minimum spanning tree method. Astronomy & Astrophysics, 597. ISSN 1432-0746

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Abstract

The aims are to investigate the clustering of the far-infrared sources from the Herschel infrared Galactic Plane Survey (Hi-GAL) in the Galactic longitude range of 71 to 67 deg. These clumps, and their spatial distribution, are an imprint of the original conditions within a molecular cloud. This will produce a catalogue of over-densities. Methods. The minimum spanning tree (MST) method was used to identify the over-densities in two dimensions. The catalogue was further refined by folding in heliocentric distances, resulting in more reliable over-densities, which are cluster candidates. Results. We found 1633 over-densities with more than ten members. Of these, 496 are defined as cluster candidates because of the reliability of the distances, with a further 1137 potential cluster candidates. The spatial distributions of the cluster candidates are different in the first and fourth quadrants, with all clusters following the spiral structure of the Milky Way. The cluster candidates are fractal. The clump mass functions of the clustered and isolated are statistically indistinguishable from each other and are consistent with Kroupa’s initial mass function.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Related URLs:
Date Deposited: 06 Mar 2018 10:57
Last Modified: 06 Mar 2018 10:57
DOI or Identification number: 10.1051/0004-6361/201629199
URI: http://researchonline.ljmu.ac.uk/id/eprint/8190

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