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The S^4G Perspective on Circumstellar Dust Extinction of Asymptotic Giant Branch Stars in M100

Meidt, Sharon E. and Schinnerer, Eva and Muñoz-Mateos, Juan-Carlos and Holwerda, Benne and Ho, Luis C. and Madore, Barry F. and Knapen, Johan H. and Bosma, Albert and Athanassoula, E. and Hinz, Joannah L. and Sheth, Kartik and Regan, Michael and Gil de Paz, Armando and Menéndez-Delmestre, Karín and Seibert, Mark and Kim, Taehyun and Mizusawa, Trisha and Gadotti, Dimitri A. and Laurikainen, Eija and Salo, Heikki and Laine, Jarkko and Comerón, Sébastien (2012) The S^4G Perspective on Circumstellar Dust Extinction of Asymptotic Giant Branch Stars in M100. Astrophysical Journal Letters, 748 (2). Art. No. L30. ISSN 2041-8205.

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We examine the effect of circumstellar dust extinction on the near-IR (NIR) contribution of asymptotic giant branch (AGB) stars in intermediate-age clusters throughout the disk of M100. For our sample of 17 AGB-dominated clusters we extract optical-to-mid-IR spectral energy distributions (SEDs) and find that NIR brightness is coupled to the mid-IR dust emission in such a way that a significant reduction of AGB light, of up to 1 mag in the K band, follows from extinction by the dust shell formed during this stage. Since the dust optical depth varies with AGB chemistry (C-rich or O-rich), our results suggest that the contribution of AGB stars to the flux from their host clusters will be closely linked to the metallicity and the progenitor mass of the AGB star, to which dust chemistry and mass-loss rate are sensitive. Our sample of clusters—each the analogue of a ~1 Gyr old post-starburst galaxy—has implications within the context of mass and age estimation via SED modeling at high-z: we find that the average ~0.5 mag extinction estimated here may be sufficient to reduce the AGB contribution in the (rest-frame) K band from ~70%, as predicted in the latest generation of synthesis models, to ~35%. Our technique for selecting AGB-dominated clusters in nearby galaxies promises to be effective for discriminating the uncertainties associated with AGB stars in intermediate-age populations that plague age and mass estimation in high-z galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription
Meidt, Sharon E.0000-0002-6118-4048
Schinnerer, Eva0000-0002-3933-7677
Ho, Luis C.0000-0001-6947-5846
Madore, Barry F.0000-0002-1576-1676
Sheth, Kartik0000-0002-5496-4118
Gil de Paz, Armando0000-0001-6150-2854
Menéndez-Delmestre, Karín0000-0003-3153-5123
Seibert, Mark0000-0002-1143-5515
Mizusawa, Trisha0000-0001-7182-5307
Additional Information:© 2012 The American Astronomical Society. Received 2011 December 18; accepted 2012 February 29; published 2012 March 19. S.E.M. thanks Arjen van der Wel for discussion and Angela Adamo and Anibal Garcia for their helpful comments on the manuscript. E.A. and A.B. thank the Centre National d’Etudes Spatiales for financial support.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Subject Keywords:galaxies: individual (M100); galaxies: star clusters: general; galaxies: stellar content; stars: AGB and post-AGB
Issue or Number:2
Record Number:CaltechAUTHORS:20120501-131704328
Persistent URL:
Official Citation:The S4G Perspective on Circumstellar Dust Extinction of Asymptotic Giant Branch Stars in M100 Sharon E. Meidt et al. 2012 ApJ 748 L30
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31252
Deposited By: Ruth Sustaita
Deposited On:01 May 2012 20:37
Last Modified:09 Mar 2020 13:19

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