SDSS-IV MaNGA: stellar population gradients as a function of galaxy environment

Goddard, D. and Thomas, D. and Maraston, C. and Westfall, K. and Etherington, J. and Riffel, R. and Mallmann, N.D. and Zheng, Z. and Argudo-Fernández, M. and Bershady, M. and Bundy, K. and Drory, N. and Law, D. and Yan, R. and Wake, D. and Weijmans, A. and Bizyaev, D. and Brownstein, J. and Lane, R.R. and Maiolino, R. and Masters, K. and Merrifield, M. and Nitschelm, C. and Pan, K. and Roman-Lopes, A. and Storchi-Bergmann, T. (2017) SDSS-IV MaNGA: stellar population gradients as a function of galaxy environment. Monthly Notices of the Royal Astronomical Society, 465 (1). pp. 688-700. ISSN 1365-2966

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Abstract

We study the internal radial gradients of stellar population properties within 1.5 Re and analyse the impact of galaxy environment. We use a representative sample of 721 galaxies with masses ranging between 109 M⊙ and 1011.5 M⊙ from the SDSS-IV survey MaNGA. We split this sample by morphology into early-type and late-type galaxies. Using the full spectral fitting code firefly, we derive the light and mass-weighted stellar population properties, age and metallicity, and calculate the gradients of these properties. We use three independent methods to quantify galaxy environment, namely the Nth nearest neighbour, the tidal strength parameter Q and distinguish between central and satellite galaxies. In our analysis, we find that early-type galaxies generally exhibit shallow light-weighted age gradients in agreement with the literature and mass-weighted median age gradients tend to be slightly positive. Late-type galaxies, instead, have negative light-weighted age gradients. We detect negative metallicity gradients in both early- and late-type galaxies that correlate with galaxy mass, with the gradients being steeper and the correlation with mass being stronger in late-types. We find, however, that stellar population gradients, for both morphological classifications, have no significant correlation with galaxy environment for all three characterizations of environment. Our results suggest that galaxy mass is the main driver of stellar population gradients in both early and late-type galaxies, and any environmental dependence, if present at all, must be very subtle.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved
Keywords: surveys, galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: formation, galaxies: spiral, galaxies: stellar content
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1093/mnras/stw2719
Depositing User: Eprints, Support
Date Deposited: 28 Mar 2017 09:02
Last Modified: 29 Mar 2017 08:46
URI: http://eprints.nottingham.ac.uk/id/eprint/41596

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