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Better age estimation using ultraviolet–optical colours: breaking the age–metallicity degeneracy

Kaviraj, S. and Rey, S.-C. and Rich, R. M. and Yoon, S.-J. and Yi, S. K. (2007) Better age estimation using ultraviolet–optical colours: breaking the age–metallicity degeneracy. Monthly Notices of the Royal Astronomical Society, 381 (1). L74-L78. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:KAVmnras07

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Abstract

We demonstrate that the combination of GALEX ultraviolet (UV) photometry in the far-UV (FUV; ~1530 Å) and near-UV (NUV; ~2310 Å) passbands with optical photometry in the standard U, B, V, R, I filters can efficiently break the age–metallicity degeneracy. We estimate well-constrained ages, metallicities and their associated errors for 42 globular clusters (GCs) in M31, and show that the full set of FUV, NUV, U, B, V, R, I photometry produces age estimates that are ~90 per cent more constrained and metallicity estimates that are ~60 per cent more constrained than those produced by using optical filters alone. The quality of the age constraints is comparable or marginally better than those achieved using a large number of spectroscopic indices.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1745-3933.2007.00370.xDOIUNSPECIFIED
Additional Information:© 2007 The Authors. Journal compilation © 2007 RAS. Accepted 2007 July 18. Received 2007 July 18; in original form 2006 November 25. We thank Andrés Jordán, Roger Davies, Rachel Somerville and Claudia Maraston for many useful discussions. We are grateful to the referee, Anne Sansom, for an insightful review that greatly improved the quality of the manuscript. SK acknowledges a PPARC DPhil scholarship, a Leverhulme Early-Career Fellowship and Research Fellowships from Worcester College, Oxford and the BIPAC institute at Oxford. SJY and SKY acknowledge support through Grant No. R01-2006-000-10716-0 from the Basic Research Program of the Korea Science & Engineering Foundation.
Funders:
Funding AgencyGrant Number
PPARC DPhil ScholarshipUNSPECIFIED
Leverhulme Early-Career FellowshipUNSPECIFIED
Worcester CollegeUNSPECIFIED
BIPAC InstituteUNSPECIFIED
Basic Research Program of the Korea Science & Engineering FoundationR01-2006-000-10716-0
Subject Keywords:elliptical and lenticular galaxies; galactic evolution; galaxy formation; fundamental parameters
Issue or Number:1
Record Number:CaltechAUTHORS:KAVmnras07
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KAVmnras07
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11340
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Aug 2008 23:34
Last Modified:25 Mar 2014 18:41

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