2014MNRAS.437L..61S

Query : 2014MNRAS.437L..61S

2014MNRAS.437L..61S - Mon. Not. R. Astron. Soc., 437, L61-L65 (2014/January-1)

Indications of a sub-linear and non-universal Kennicutt-Schmidt relationship.

SHETTY R., KELLY B.C., RAHMAN N., BIGIEL F., BOLATTO A.D., CLARK P.C., KLESSEN R.S. and KONSTANDIN L.K.

Abstract (from CDS):

We estimate the parameters of the Kennicutt-Schmidt (KS) relationship, linking the star formation rate (ΣSFR) to the molecular gas surface density (Σmol), in the Survey Toward Infrared-Bright Nearby Galaxies sample of nearby disc galaxies using a hierarchical Bayesian method. This method rigorously treats measurement uncertainties, and provides accurate parameter estimates for both individual galaxies and the entire population. Assuming standard conversion factors to estimate ΣSFR and Σmol from the observations, we find that the KS parameters vary between galaxies, indicating that no universal relationship holds for all galaxies. The KS slope of the whole population is 0.76, with the 2σ range extending from 0.58 to 0.94. These results imply that the molecular gas depletion time is not constant, but varies from galaxy-to-galaxy, and increases with the molecular gas surface density. Therefore, other galactic properties besides just Σmol affect ΣSFR, such as the gas fraction or stellar mass. The non-universality of the KS relationship indicates that a comprehensive theory of star formation must take into account additional physical processes that may vary from galaxy to galaxy.

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

Journal keyword(s): methods: statistical - galaxies: ISM - galaxies: star formation

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 772 GiP 01 59 19.5557148984 +19 00 27.475677216 11.35 11.09 10.31 10.23 9.38 ~ 339 1
2 NGC 1637 Sy2 04 41 28.1926876152 -02 51 28.667815488   11.4   11.0 11.3 ~ 444 0
3 NGC 3147 Sy2 10 16 53.6388580752 +73 24 02.641798224   11.43 10.61     ~ 533 2
4 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 946 1
5 NGC 3593 GiG 11 14 36.9731893800 +12 49 05.497790664   11.8       ~ 376 2
6 NGC 3949 GiC 11 53 41.7311041896 +47 51 31.401451476   10.9       ~ 351 1
7 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 1004 2
8 NGC 4273 H2G 12 19 56.063 +05 20 36.12   12.3       ~ 274 0
9 NGC 4536 H2G 12 34 27.12887 +02 11 16.3680 11.14 11.16 10.55 17.393   ~ 913 3
10 NGC 4654 H2G 12 43 56.638 +13 07 34.86   11.8       ~ 600 1
11 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
12 NGC 5390 LIN 13 55 39.9385716624 +40 27 42.380606592   12.81 11.93 10.04   ~ 373 1
13 NGC 5713 GiG 14 40 11.528 -00 17 21.16 11.88 11.84 11.20     ~ 421 2
14 NGC 6951 Sy2 20 37 14.1228088488 +66 06 20.049916392   11.64 10.65     ~ 553 2

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