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Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). I. Overview

Gordon, K. D. and Indebetouw, R. and Reach, W. and Paladini, R. and Paradis, D. and van Dyk, S. (2011) Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). I. Overview. Astronomical Journal, 142 (4). Art. No. 102. ISSN 0004-6256. https://resolver.caltech.edu/CaltechAUTHORS:20111107-105720089

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Abstract

The Small Magellanic Cloud (SMC) provides a unique laboratory for the study of the lifecycle of dust given its low metallicity (~1/5 solar) and relative proximity (~60 kpc). This motivated the SAGE-SMC (Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud) Spitzer Legacy program with the specific goals of studying the amount and type of dust in the present interstellar medium, the sources of dust in the winds of evolved stars, and how much dust is consumed in star formation. This program mapped the full SMC (30 deg^2) including the body, wing, and tail in seven bands from 3.6 to 160 μm using IRAC and MIPS on the Spitzer Space Telescope. The data were reduced and mosaicked, and the point sources were measured using customized routines specific for large surveys. We have made the resulting mosaics and point-source catalogs available to the community. The infrared colors of the SMC are compared to those of other nearby galaxies and the 8 μm/24 μm ratio is somewhat lower than the average and the 70 μm/160 μm ratio is somewhat higher than the average. The global infrared spectral energy distribution (SED) shows that the SMC has approximately 1/3 the aromatic emission/polycyclic aromatic hydrocarbon abundance of most nearby galaxies. Infrared color-magnitude diagrams are given illustrating the distribution of different asymptotic giant branch stars and the locations of young stellar objects. Finally, the average SED of H II/star formation regions is compared to the equivalent Large Magellanic Cloud average H II/star formation region SED. These preliminary results will be expanded in detail in subsequent papers.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-6256/142/4/102 DOIArticle
http://iopscience.iop.org/1538-3881/142/4/102/PublisherArticle
ORCID:
AuthorORCID
Reach, W.0000-0001-8362-4094
Paladini, R.0000-0002-5158-243X
van Dyk, S.0000-0001-9038-9950
Additional Information:© 2011 American Astronomical Society. Received 2011 April 14; accepted 2011 July 17; published 2011 August 23. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407. Support for this work was provided by NASA through Contract Number 1340964 issued by JPL/Caltech. Facility: Spitzer (IRAC, MIPS)
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA1407
NASA/JPL/Caltech1340964
Subject Keywords:galaxies: individual (SMC)
Issue or Number:4
Classification Code:PACS: 95.80.+p; 98.62.Ai; 98.62.Hr; 98.58.Hf; 98.62.Qz; 98.56.Si; 98.70.Lt; 98.58.Ay
Record Number:CaltechAUTHORS:20111107-105720089
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20111107-105720089
Official Citation:Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). I. Overview K. D. Gordon et al. 2011 The Astronomical Journal 142 102
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27648
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 Nov 2011 19:26
Last Modified:03 Oct 2019 03:25

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