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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
SDSS-IV MaNGA: The spatially resolved stellar initial mass function in ~400 early-type galaxies
Monthly Notices of the Royal Astronomical Society, Volume 477, No. 3, Year 2018
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Description
Mapping Nearby Galaxies at Apache Point Observatory provides the opportunity to make precise spatially resolved measurements of the IMF slope in galaxies owing to its unique combination of spatial resolution, wavelength coverage, and sample size. We derive radial gradients in age, element abundances, and IMF slope analysing optical and near-infrared absorption features from stacked spectra out to the half-light radius of 366 early-type galaxies with masses 9.9-10.8 logM/M⊙. We find flat gradients in age and [α/Fe] ratio, as well as negative gradients in metallicity, consistent with the literature. We further derive significant negative gradients in the [Na/Fe] ratio with galaxy centres being well enhanced in Na abundance by up to 0.5 dex. Finally, we find a gradient in IMF slope with a bottom-heavy IMF in the centre (typical mass excess factor of 1.5) and a Milky Way-type IMF at the half-light radius. This pattern is mass dependent with the lowest mass galaxies in our sample featuring only a shallow gradient around a MilkyWay IMF. Our results imply the local IMF-σ relation within galaxies to be even steeper than the global relation and hint towards the local metallicity being the dominating factor behind the IMF variations. We also employ different stellar population models in our analysis and show that a radial IMF gradient is found independently of the stellar population model used. A similar analysis of theWing-Ford band provides inconsistent results and further evidence of the difficulty in measuring and modelling this particular feature. © 2018 The Author(s).
Authors & Co-Authors
Parikh, Taniya
United Kingdom, Portsmouth
University of Portsmouth
Thomas, Daniel B.
United Kingdom, Portsmouth
University of Portsmouth
Maraston, Claudia
United Kingdom, Portsmouth
University of Portsmouth
Westfall, Kyle B.
United States, Santa Cruz
University of California, Santa Cruz
Lian, Jianhui
United Kingdom, Portsmouth
University of Portsmouth
Meneses-Goytia, Sofia
United Kingdom, Portsmouth
University of Portsmouth
Jones, Amy M.
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Vaughan, Sam P.
United Kingdom, Oxford
University of Oxford
Andrews, Brett H.
United States, Pittsburgh
University of Pittsburgh
Bershady, Matthew A.
United States, Madison
University of Wisconsin-madison
Bizyaev, Dmitry Anatolevich
United States, Sunspot
Apache Point Observatory
Brinkmann, Jonathan V.
United States, Sunspot
Apache Point Observatory
Brownstein, Joel R.
United States, Salt Lake City
The University of Utah
Bundy, Kevin A.
United States, Santa Cruz
University of California, Santa Cruz
Drory, Niv
United States, Austin
The University of Texas at Austin
Emsellem, Éric
Germany, Garching Bei Munchen
European Southern Observatory
Law, David R.
United States, Baltimore
Space Telescope Science Institute
Newman, Jeffrey Allen
United States, Pittsburgh
University of Pittsburgh
Roman-Lopes, Alexandre
Chile, La Serena
Universidad de la Serena
Wake, David A.
United States, Asheville
The University of North Carolina at Asheville
Yan, Renbin
United States, Lexington
University of Kentucky
Zheng, Zheng
China, Beijing
Chinese Academy of Sciences
Statistics
Citations: 81
Authors: 22
Affiliations: 15
Identifiers
Doi:
10.1093/mnras/sty785
ISSN:
00358711
Research Areas
Health System And Policy
Study Design
Cross Sectional Study