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Connection between dynamically derived Initial Mass Function normalization and stellar population parameters

McDermid, Richard M. and Cappellari, Michele and Alatalo, Katherine and Bayet, Estelle and Blitz, Leo and Bois, Maxime and Bournaud, Frédéric and Bureau, Martin and Crocker, Alison F. and Davies, Roger L. and Davis, Timothy A. and de Zeeuw, P. T. and Duc, Pierre-Alain and Emsellem, Eric and Khochfar, Sadegh and Krajnović, Davor and Kuntschner, Harald and Morganti, Raffaella and Naab, Thorsten and Oosterloo, Tom and Sarzi, Marc and Scott, Nicholas and Serra, Paolo and Weijmans, Anne-Marie and Young, Lisa M. (2014) Connection between dynamically derived Initial Mass Function normalization and stellar population parameters. Astrophysical Journal Letters, 792 (2). Art. No. L37. ISSN 2041-8205. https://resolver.caltech.edu/CaltechAUTHORS:20141013-090941903

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Abstract

We report on empirical trends between the dynamically determined stellar initial mass function (IMF) and stellar population properties for a complete, volume-limited sample of 260 early-type galaxies from the ATLAS^(3D) project. We study trends between our dynamically derived IMF normalization ɑ_(dyn) ≡ (M/L)_(stars)/(M/L)_(Salp) and absorption line strengths, and interpret these via single stellar population-equivalent ages, abundance ratios (measured as [ɑ/Fe]), and total metallicity, [Z/H]. We find that old and alpha-enhanced galaxies tend to have on ɑverage heavier (Salpeter-like) mass normalization of the IMF, but stellar population does not appear to be a good predictor of the IMF, with a large range of ɑ_(dyn) at a given population parameter. As a result, we find weak ɑ_(dyn)-[ɑ/Fe] and ɑ_(dyn)-Age correlations and no significant ɑ_(dyn)-[Z/H] correlation. The observed trends appear significantly weaker than those reported in studies that measure the IMF normalization via the low-mass star demographics inferred through stellar spectral analysis.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://iopscience.iop.org/2041-8205/792/2/L37/PublisherArticle
http://arxiv.org/abs/1408.3189arXivDiscussion Paper
http://dx.doi.org/10.1088/2041-8205/792/2/L37DOIArticle
ORCID:
AuthorORCID
Alatalo, Katherine0000-0002-4261-2326
Crocker, Alison F.0000-0001-8513-4945
Alternate Title:Connection between dynamically derived IMF normalisation and stellar population parameters
Additional Information:© 2014 American Astronomical Society. Received 2014 June 10; accepted 2014 August 10; published 2014 August 27. The authors thank the referee for helping to improve this article. The research leading to these results has received funding from the European Community’s Seventh Framework Programme (/FP7/2007-2013/) under grant agreement No. 229517. M.C. acknowledges support from a Royal Society University Research Fellowship. This work was supported by the rolling grants PP/E001114/1 and ST/H002456/1 and visitor’s grants PPA/V/S/2002/00553, PP/E001564/1 and ST/H504862/1 from the UK . R.L.D. acknowledges travel and computer grants from Christ Church, Oxford and support from the Royal Society in the form of a Wolfson Merit Award 502011.K502/jd. S.K. acknowledges support from the Royal Society Joint Projects Grant JP0869822. T.N. and M. Bois acknowledge support from the DFG Cluster of Excellence “Origin and Structure of the Universe.” M.S. acknowledges support from a STFC Advanced Fellowship ST/F009186/1. During this research, M. Bois has received funding from the European Research Council under the Advanced Grant Program Num. 267399-Momentum. L.Y. acknowledges support from NSF grant AST-1109803. The authors acknowledge financial support from ESO.
Funders:
Funding AgencyGrant Number
European Research Council (ERC)229517
Particle Physics and Astronomy Research Council (PPARC)PP/E001114/1
Science and Technology Facilities Council (STFC)ST/H002456/1
Particle Physics and Astronomy Research Council (PPARC)PPA/V/S/2002/00553
Particle Physics and Astronomy Research Council (PPARC)PP/E001564/1
Science and Technology Facilities Council (STFC)ST/H504862/1
Christ Church, OxfordUNSPECIFIED
Royal Society502011.K502/jd
Royal SocietyJP0869822
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Science and Technology Facilities Council (STFC)ST/F009186/1
European Research Council (ERC)267399-Momentum
NSFAST-1109803
European Southern Observatory (ESO)UNSPECIFIED
Subject Keywords:galaxies: abundances; galaxies: elliptical and lenticular, cD; galaxies: kinematics and dynamics; galaxies: stellar content
Issue or Number:2
Record Number:CaltechAUTHORS:20141013-090941903
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20141013-090941903
Official Citation:Connection between Dynamically Derived Initial Mass Function Normalization and Stellar Population Parameters Richard M. McDermid et al. 2014 ApJ 792 L37
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50347
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Oct 2014 23:29
Last Modified:03 Oct 2019 07:22

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