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A comprehensive HST BVI catalogue of star clusters in five Hickson compact groups of galaxies

Fedotov, K and Gallagher, SC and Durrell, PR and Bastian, N and Konstantopoulos, IS and Charlton, J and Johnson, KE and Chandar, R (2015) A comprehensive HST BVI catalogue of star clusters in five Hickson compact groups of galaxies. Monthly Notices of the Royal Astronomical Society, 449 (3). pp. 2937-2973. ISSN 0035-8711

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Abstract

We present a photometric catalogue of star cluster candidates in Hickson compact groups (HCGs) 7, 31, 42, 59, and 92, based on observations with the Advanced Camera for Surveys and the Wide Field Camera 3 on the Hubble Space Telescope. The catalogue contains precise cluster positions (right ascension and declination), magnitudes, and colours in the BVI filters. The number of detected sources ranges from 2200 to 5600 per group, from which we construct the high-confidence sample by applying a number of criteria designed to reduce foreground and background contaminants. Furthermore, the high-confidence cluster candidates for each of the 16 galaxies in our sample are split into two subpopulations: one that may contain young star clusters and one that is dominated by globular older clusters. The ratio of young star cluster to globular cluster candidates varies from group to group, from equal numbers to the extreme of HCG 31 which has a ratio of 8 to 1, due to a recent starburst induced by interactions in the group. We find that the number of blue clusters with MV < −9 correlates well with the current star formation rate in an individual galaxy, while the number of globular cluster candidates with MV < −7.8 correlates well (though with large scatter) with the stellar mass. Analyses of the high-confidence sample presented in this paper show that star clusters can be successfully used to infer the gross star formation history of the host groups and therefore determine their placement in a proposed evolutionary sequence for compact galaxy groups.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 07 Nov 2017 10:40
Last Modified: 07 Nov 2017 10:40
DOI or Identification number: 10.1093/mnras/stv349
URI: http://researchonline.ljmu.ac.uk/id/eprint/7480

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