Abstract
We investigate the clustering of early-type stars younger than 300 Myr on galactic scales in M 31. Based on the stellar photometric catalogs of the Panchromatic Hubble Andromeda Treasury program that also provides stellar parameters derived from the individual energy distributions, our analysis focused on the young stars in three star-forming regions, located at galactocentric distances of about 5, 10, and 15 kpc, corresponding to the inner spiral arms, the ring structure, and the outer arm, respectively. We apply the two-point correlation function to our selected sample to investigate the clustering behavior of these stars across different time- and length-scales. We find that young stellar structure survives across the whole extent of M 31 for at least 300 Myr. Stellar distribution in all regions appears to be self-similar, with younger stars being systematically more strongly clustered than the older, which are more dispersed. The observed clustering is interpreted as being induced by turbulence, the driving source for which is probably gravitational instabilities driven by the spiral arms, which are stronger closer to the galactic centre.
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Acknowledgement
Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute (STScI). STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. D.A.G. acknowledges support by the German Research Foundation through grant GO 1659/3-1. I also acknowledge very useful discussions with Bruce Elmegreen, Ralf Klessen, Sacha Hony and Lukas Konstandin, which helped improve this manuscript. Finally, I would like to thank the organizers for a very interesting meeting in a wonderful location, and wish to our honourees and their beloved all the best for good health and happiness!
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Gouliermis, D. et al. (2015). The Panchromatic Hubble Andromeda Treasury. Progression of Large-Scale Star Formation Across Space and Time in M 31. In: Freeman, K., Elmegreen, B., Block, D., Woolway, M. (eds) Lessons from the Local Group. Springer, Cham. https://doi.org/10.1007/978-3-319-10614-4_24
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DOI: https://doi.org/10.1007/978-3-319-10614-4_24
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