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23 April 2024

» arxiv » 1504.2120

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A Global Star Forming Episode in M31 2-4 Gyr Ago
Benjamin F. Williams ; Julianne J. Dalcanton ; Andrew E. Dolphin ; Daniel R. Weisz ; Alexia R. Lewis ; Dustin Lang ; Eric F. Bell ; Martha Boyer ; Morgan Fouesneau ; Karoline M. Gilbert ; Antonela Monachesi ; Evan Skillman ;
Date:	8 Apr 2015
Abstract:	We have identified a major global enhancement of star formation in the inner M31 disk that occurred between 2-4 Gyr ago, producing $sim$60% of the stellar mass formed in the past 5 Gyr. The presence of this episode in the inner disk was discovered by modeling the optical resolved star color-magnitude diagrams of low extinction regions in the main disk of M31 (3$<$R$<$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.
Source:	arXiv, 1504.2120
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