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Star formation history in two fields of the small magellanic cloud bar

Citation

Cignoni, M and Cole, AA and Tosi, M and Gallagher, JS and Sabbi, E and Anderson, J and Grebel, EK and Nota, A, Star formation history in two fields of the small magellanic cloud bar, Astrophysical Journal, 754, (2) Article 130. ISSN 0004-637X (2012) [Refereed Article]

Copyright Statement

Copyright 2012 The American Astronomical Society

DOI: doi:10.1088/0004-637X/754/2/130

Abstract

The Bar is the most productive region of the Small Magellanic Cloud in terms of star formation but also the least studied one. In this paper, we investigate the star formation history of two fields located in the SW and in the NE portion of the Bar using two independent and well-tested procedures applied to the color-magnitude diagrams of their stellar populations resolved by means of deep Hubble Space Telescope photometry. We find that the Bar experienced a negligible star formation activity in the first few Gyr, followed by a dramatic enhancement from 6 to 4Gyr ago and a nearly constant activity since then. The two examined fields differ both in the rate of star formation and in the ratio of recent over past activity, but share the very low level of initial activity and its sudden increase around 5Gyr ago. The striking similarity between the timing of the enhancement and the timing of the major episode in the Large Magellanic Cloud is suggestive of a close encounter triggering star formation.

Item Details

Item Type:Refereed Article
Keywords:galaxies: evolution; galaxies: formation; galaxies: individual (Small Magellanic Cloud); galaxies: interactions; galaxies: photometry; galaxies: star formation; galaxies: stellar content; galaxies: structure; stars: massive
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Cosmology and Extragalactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Cole, AA (Dr Andrew Cole)
ID Code:82639
Year Published:2012
Web of Science® Times Cited:18
Deposited By:Mathematics and Physics
Deposited On:2013-02-08
Last Modified:2017-11-06
Downloads:0

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