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The Next Generation Virgo Cluster Survey. VII. The intrinsic shapes of low-luminosity galaxies in the core of the Virgo cluster, and a comparison with the Local Group

Sánchez-Janssen, Rubén and Ferrarese, Laura and MacArthur, Lauren A. and Côté, Patrick and Blakeslee, John P. and Cuillandre, Jean-Charles and Duc, Pierre-Alain and Durrell, Patrick and Gwyn, Stephen and McConnacchie, Alan W. and Boselli, Alessandro and Courteau, Stéphane and Emsellem, Eric and Mei, Simona and Peng, Eric and Puzia, Thomas H. and Roediger, Joel and Simard, Luc and Boyer, Fred and Santos, Matthew (2016) The Next Generation Virgo Cluster Survey. VII. The intrinsic shapes of low-luminosity galaxies in the core of the Virgo cluster, and a comparison with the Local Group. Astrophysical Journal, 820 (1). Art. No. 69. ISSN 0004-637X.

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We investigate the intrinsic shapes of low-luminosity galaxies in the central 300 kpc of the Virgo Cluster using deep imaging obtained as part of the Next Generation Virgo Cluster Survey (NGVS). We build a sample of nearly 300 red-sequence cluster members in the yet-unexplored −14 < M_g < −8 mag range, and we measure their apparent axis ratios, q, through Sérsic fits to their two-dimensional light distribution, which is well described by a constant ellipticity parameter. The resulting distribution of apparent axis ratios is then fit by families of triaxial models with normally distributed intrinsic ellipticities, E = 1 − C/A, and triaxialities, T = (A^2 − B^2)/(A^2 − C^2). We develop a Bayesian framework to explore the posterior distribution of the model parameters, which allows us to work directly on discrete data, and to account for individual, surface-brightness-dependent axis ratio uncertainties. For this population we infer a mean intrinsic ellipticity E = 0.43_(-0.02)^(+0.02) and a mean triaxiality T = 0.16_(-0.06)^(+0.07). This implies that faint Virgo galaxies are best described as a family of thick, nearly oblate spheroids with mean intrinsic axis ratios 1:0.94:0.57. The core of Virgo lacks highly elongated low-luminosity galaxies, with 95% of the population having q > 0.45. We additionally attempt a study of the intrinsic shapes of Local Group (LG) satellites of similar luminosities. For the LG population we infer a slightly larger mean intrinsic ellipticity E = 0.51_(-0.06)^(+0.07), and the paucity of objects with round apparent shapes translates into more triaxial mean shapes, 1:0.76:0.49. Numerical studies that follow the tidal evolution of satellites within LG-sized halos are in good agreement with the inferred shape distributions, but the mismatch for faint galaxies in Virgo highlights the need for more adequate simulations of this population in the cluster environment. We finally compare the intrinsic shapes of NGVS low-mass galaxies with samples of more massive quiescent systems, and with field, star-forming galaxies of similar luminosities. We find that the intrinsic flattening in this low-luminosity regime is almost independent of the environment in which the galaxy resides, but there is a hint that objects may be slightly rounder in denser environments. The comparable flattening distributions of low-luminosity galaxies that have experienced very different degrees of environmental effects suggest that internal processes are the main drivers of galaxy structure at low masses, with external mechanisms playing a secondary role.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Côté, Patrick0000-0003-1184-8114
Mei, Simona0000-0002-2849-559X
Puzia, Thomas H.0000-0003-0350-7061
Additional Information:© 2016 The American Astronomical Society. Received 2015 July 14; accepted 2016 January 27; published 2016 March 21. This work is supported in part by the Canadian Advanced Network for Astronomical Research (CANFAR), which has been made possible by funding from CANARIE under the Network-Enabled Platforms program. This research used the facilities of the Canadian Astronomy Data Centre operated by the National Research Council of Canada with the support of the Canadian Space Agency. The authors further acknowledge use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and the HyperLeda database (
Funding AgencyGrant Number
Canadian Advanced Network for Astronomical Research (CANFAR)UNSPECIFIED
CANARIE Network-Enabled Platforms ProgramUNSPECIFIED
Canadian Space Agency (CSA)UNSPECIFIED
Institut Universitaire de France (IUF)UNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1121005
Subject Keywords:galaxies: clusters: individual (Virgo) ; galaxies: dwarf; galaxies: fundamental parameters; galaxies: photometry; galaxies: structure; Local Group
Issue or Number:1
Record Number:CaltechAUTHORS:20160427-070142567
Persistent URL:
Official Citation:Rubén Sánchez-Janssen et al 2016 ApJ 820 69
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66494
Deposited By: Ruth Sustaita
Deposited On:27 Apr 2016 14:49
Last Modified:06 Nov 2019 23:27

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