2013MNRAS.436.3167F


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST15:48:16

2013MNRAS.436.3167F - Mon. Not. R. Astron. Soc., 436, 3167-3172 (2013/December-3)

The origin of physical variations in the star formation law.

FEDERRATH C.

Abstract (from CDS):

Observations of external galaxies and of local star-forming clouds in the Milky Way have suggested a variety of star formation laws, i.e. simple direct relations between the column density of star formation (ΣSFR: the amount of gas forming stars per unit area and time) and the column density of available gas (Σgas). Extending previous studies, we show that these different, sometimes contradictory relations for Milky Way clouds, nearby galaxies, and high-redshift discs and starbursts can be combined in one universal star formation law in which ΣSFR is about 1 percent of the local gas collapse rate, Σgas/tff, but a significant scatter remains in this relation. Using computer simulations and theoretical models, we find that the observed scatter may be primarily controlled by physical variations in the Mach number of the turbulence and by differences in the star formation efficiency. Secondary variations can be induced by changes in the virial parameter, turbulent driving and magnetic field. The predictions of our models are testable with observations that constrain both the Mach number and the star formation efficiency in Milky Way clouds, external disc and starburst galaxies at low and high redshift. We also find that reduced telescope resolution does not strongly affect such measurements when ΣSFR is plotted against Σgas/tff.

Abstract Copyright: © 2013 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): turbulence - stars: formation - ISM: clouds - galaxies: high-redshift - galaxies: ISM - galaxies: starburst

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9761 1
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3681 0
3 ZW VII 31 G 05 16 46.384 +79 40 12.63   15.8       ~ 139 0
4 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2741 4
5 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2306 2
6 NGC 7552 GiP 23 16 10.767 -42 35 05.39 11.34 11.22 10.57 10.08 11.1 ~ 514 3

    Equat.    Gal    SGal    Ecl

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2021.04.19-15:48:16

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