Mon. Not. R. Astron. Soc., 456, 4128-4144 (2016/March-2)
Star formation laws in the Andromeda galaxy: gas, stars, metals and the surface density of star formation.
RAHMANI S., LIANOU S. and BARMBY P.
Abstract (from CDS):
We use hierarchical Bayesian regression analysis to investigate star formation laws in the Andromeda galaxy (M31) in both local (30, 155 and 750 pc) and global cases. We study and compare the well-known Kennicutt-Schmidt law, the extended Schmidt law and the metallicity/star formation correlation. Using a combination of Hα and 24 µm emission, a combination of far-ultraviolet and 24 µm, and the total infrared emission, we estimate the total star formation rate (SFR) in M31 to be between 0.35±0.04 and 0.4±0.04 M☉/yr. We produce a stellar mass surface density map using IRAC 3.6 µm emission and measured the total stellar mass to be 6.9x1010 M☉. For the Kennicutt-Schmidt law in M31, we find the power-law index N to be between 0.49 and 1.18; for all the laws, the power-law index varies more with changing gas tracer than with SFR tracer. The power-law index also changes with distance from the centre of the galaxy. We also applied the commonly used ordinary least-squares fitting method and showed that using different fitting methods leads to different power-law indices. There is a correlation between the surface density of SFR and the stellar mass surface density, which confirms that the Kennicutt-Schmidt law needs to be extended to consider the other physical properties of galaxies. We found a weak correlation between metallicity, the SFR and the stellar mass surface density.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2016)
methods: observational - methods: statistical - galaxies: ISM - galaxies: spiral - galaxies: star formation - galaxies: stellar content
View the references in ADS
To bookmark this query, right click on this link: simbad:2016MNRAS.456.4128R and select 'bookmark this link' or equivalent in the popup menu