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The HST/ACS Coma Cluster Survey - X. Nuclear star clusters in low-mass early-type galaxies: scaling relations

den Brok, M and Peletier, RF and Seth, A and Balcells, M and Dominguez, L and Graham, AW and Carter, D and Erwin, P and Ferguson, HC and Goudfrooij, P and Guzman, R and Hoyos, C and Jogee, S and Lucey, J and Phillipps, S and Puzia, T and Valentijn, E and Kleijn, GV and Weinzirl, T (2014) The HST/ACS Coma Cluster Survey - X. Nuclear star clusters in low-mass early-type galaxies: scaling relations. Monthly Notices of the Royal Astronomical Society, 445 (3). pp. 2385-2403. ISSN 0035-8711

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Abstract

We present scaling relations between structural properties of nuclear star clusters and their host galaxies for a sample of early-type dwarf galaxies observed as part of the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Coma Cluster Survey. We have analysed the light profiles of 200 early-type dwarf galaxies in the magnitude range 16.0 < mF814W < 22.6 mag, corresponding to -19.0 < MF814W < -12.4 mag. Nuclear star clusters are detected in 80 per cent of the galaxies, thus doubling the sample of HST-observed early-type dwarf galaxies with nuclear star clusters.We confirm that the nuclear star cluster detection
fraction decreases strongly towards faint magnitudes. The luminosities of nuclear star clusters do not scale linearly with host galaxy luminosity. A linear fit yields Lnuc ~ L0.57±0.05 gal. The nuclear star cluster–host galaxy luminosity scaling relation for low-mass early-type dwarf
galaxies is consistent with formation by globular cluster (GC) accretion. We find that at similar luminosities, galaxies with higher S´ersic indices have slightly more luminous nuclear star clusters. Rounder galaxies have on average more luminous clusters. Some of the nuclear
star clusters are resolved, despite the distance of Coma. We argue that the relation between nuclear star cluster mass and size is consistent with both formation by GC accretion and in situ formation. Our data are consistent with GC inspiralling being the dominant mechanism at
low masses, although the observed trend with S´ersic index suggests that in situ star formation is an important second-order effect.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 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
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 19 Mar 2015 14:53
Last Modified: 07 Sep 2017 06:34
DOI or Identification number: 10.1093/mnras/stu1906
URI: http://researchonline.ljmu.ac.uk/id/eprint/772

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