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A Global Star Forming Episode in M31 2-4 Gyr Ago

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arxiv 1504.02120 v1 pith:SHVDWC5O submitted 2015-04-08 astro-ph.GA

Benjamin F. Williams , Julianne J. Dalcanton , Andrew E. Dolphin , Daniel R. Weisz , Alexia R. Lewis , Dustin Lang , Eric F. Bell , Martha Boyer
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Morgan Fouesneau Karoline M. Gilbert Antonela Monachesi Evan Skillman
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keywords stardiskformationglobalburstenhancementepisodeinner
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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.

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Cited by 2 Pith papers

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