Connection between dynamically derived Initial Mass Function normalization and stellar population parameters
- Creators
- McDermid, Richard M.
- Cappellari, Michele
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Alatalo, Katherine
- Bayet, Estelle
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Blitz, Leo
- Bois, Maxime
- Bournaud, Frédéric
- Bureau, Martin
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Crocker, Alison F.
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Davies, Roger L.
- Davis, Timothy A.
- de Zeeuw, P. T.
- Duc, Pierre-Alain
- Emsellem, Eric
- Khochfar, Sadegh
- Krajnović, Davor
- Kuntschner, Harald
- Morganti, Raffaella
- Naab, Thorsten
- Oosterloo, Tom
- Sarzi, Marc
- Scott, Nicholas
- Serra, Paolo
- Weijmans, Anne-Marie
- Young, Lisa M.
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.
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.Attached Files
Published - 2041-8205_792_2_L37.pdf
Submitted - 1408.3189v1.pdf
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Additional details
- Alternative title
- Connection between dynamically derived IMF normalisation and stellar population parameters
- Eprint ID
- 50347
- Resolver ID
- CaltechAUTHORS:20141013-090941903
- 229517
- European Research Council (ERC)
- PP/E001114/1
- Particle Physics and Astronomy Research Council (PPARC)
- ST/H002456/1
- Science and Technology Facilities Council (STFC)
- PPA/V/S/2002/00553
- Particle Physics and Astronomy Research Council (PPARC)
- PP/E001564/1
- Particle Physics and Astronomy Research Council (PPARC)
- ST/H504862/1
- Science and Technology Facilities Council (STFC)
- Christ Church, Oxford
- 502011.K502/jd
- Royal Society
- JP0869822
- Royal Society
- Deutsche Forschungsgemeinschaft (DFG)
- ST/F009186/1
- Science and Technology Facilities Council (STFC)
- 267399-Momentum
- European Research Council (ERC)
- AST-1109803
- NSF
- European Southern Observatory (ESO)
- Created
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2014-10-13Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field