Query : 2020A&A...643L..11A

2020A&A...643L..11A - Astronomy and Astrophysics, volume 643, L11-11 (2020/11-1)

The molecular mass function of the local Universe.


Abstract (from CDS):

Aims. We construct the molecular mass function using the bivariate K-band-mass function (BMF) of the Herschel Reference Survey (HRS), which is a volume-limited sample that has already been widely studied at the entire electromagnetic spectrum.
Methods. The molecular mass function was derived from the K-band and the gas mass cumulative distribution using a copula method, which is described in detail in our previous papers.
Results. The H2 mass is relatively strongly correlated with the K-band luminosity because of the tight relation between the stellar mass and the molecular gas mass within the sample with a scatter, which is likely due to those galaxies which have lost their molecular content because of environmental effects or because of a larger gas consumption due to past star formation processes. The derived H2 MF samples the molecular mass range from ∼4 x 106M to ∼1010M, and when compared with theoretical models, it agrees well with the theoretical predictions at the lower end of the mass values; whereas at masses larger than 1010M, the HRS sample may miss galaxies with a large content of molecular hydrogen and the outcomes are not conclusive. The value of the local density of the molecular gas mass inferred from our analysis is ∼1.5x107M/Mpc3, and it is compared with the results at larger redshifts, confirming the lack of strong evolution for the molecular mass density between z=0 and z=4.
Conclusions. This is the first molecular mass function that has been derived on a complete sample in the local Universe, which can be used as a reliable calibration at redshift z=0 for models aiming to predict the evolution of the molecular mass density.

Abstract Copyright: © ESO 2020

Journal keyword(s): ISM: molecules - submillimeter: galaxies - galaxies: statistics - galaxies: luminosity function - mass function

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2285 0
2 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5667 1

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