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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 720362.0, MPI für Astronomie / Publikationen_mpia
A global star-forming episode in M31 2-4 Gyr ago
Authors:Williams, B. F.; Dalcanton, J. J.; Dolphin, A. E.; Weisz, D. R.; Lewis, A. R.; Lang, D.; Bell, E. F.; Boyer, M.; Fouesneau, M.; Gilbert, K. M.; Monachesi, A.; Skillman, E.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:The Astrophysical Journal
Volume:806
Issue / Number:1
Start Page:id. 48 (9 pp)
Audience:Not Specified
Abstract / Description:We have identified a major global enhancement of star formation in the inner M31 disk that occurred between 2-4 Gyr ago, producing ˜60% of the stellar mass formed in the past 5 Gyr. The presence of this episode in the inner disk was discovered by modeling the optical resolved star color-magnitude diagrams of low extinction regions in the main disk of M31 (3 < R < 20 kpc) as part of the Panchromatic Hubble Andromeda Treasury. This measurement confirms and extends recent measurements of a widespread star formation enhancement of similar age in the outer disk, suggesting that this burst was both massive and global. Following the galaxy-wide burst, the star formation rate of M31 has significantly declined. We briefly discuss possible causes for these features of the M31 evolutionary history, including interactions with M32, M33, and/or a merger.
Free Keywords:galaxies: evolution; galaxies: individual: M31; galaxies: interactions
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X
URL:http://cdsads.u-strasbg.fr/abs/2015ApJ...806...48W
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