Comparing Young Stellar Populations Across Active Regions in the M31 Disk

Abstract

I present preliminary BV resolved stellar photometry of the M31 disk measured from the data set of the NOAO/CTIO Local Group Survey. I have performed detailed analyses of the star formation histories in and around three currently active regions in the M31 disk: OB 78, OB 102 and the northeast spiral arm. The results suggest that low H$\alpha$ emission from OB 78 compared to other active regions is directly related to the details of the recent star formation histories of the regions. In addition, while every active region I analyzed shows a recent increase in star formation activity, some active regions also contain overdensities of stars with ages <~100 Myr compared to adjacent regions. The adjacent regions show a relatively constant, low star formation rate over the past 100 Myr. There is no significant difference between the stellar populations on either side of the active regions. This symmetry provides no obvious signature of recent propagation of star formation near these currently active regions of the M31 disk.

32 pages, 11 figures, accepted for publication in MNRAS

Cited by in corpus (10)

• The Panchromatic Hubble Andromeda Treasury XI: The Spatially-Resolved Recent Star Formation History of M31
• Milky Way vs Andromeda: a tale of two disks
• The Recent Star Formation History of the M31 Disk
• A Synoptic X-ray Study of M31 with the Chandra-HRC
• The Stellar Content and Star Formation History of the late-type spiral galaxy NGC 300 from Hubble Space Telescope observations
• Cold and Hot gas distribution around the Milky-Way-M31 system in the HESTIA simulations
• Discovery of an X-ray Nova in M31
• Chandra and Hubble Study of a New Transient X-ray Source in M31
• An X-ray Transient and Optical Counterpart in the M31 Bulge
• Chemical Evolution of M31