Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
Reinhard Genzel,Linda J. Tacconi,Dieter Lutz,Amelie Saintonge,S. Berta,Benjamin Magnelli,Francoise Combes,Santiago García-Burillo,R. Neri,Alberto Bolatto,T. Contini,S. J. Lilly,Jérémie Boissier,Frederic Boone,Nicolas Bouché,F. Bournaud,A. Burkert,Marcella Carollo,Luis Colina,Michael C. Cooper,Peter Timothy Cox,Chiara Feruglio,N. M. Förster Schreiber,Jonathan Freundlich,Javier Graciá-Carpio,Stéphanie Juneau,Katarina Kovac,Magdalena Lippa,T. Naab,P. Salomé,Alvio Renzini,Amiel Sternberg,Fabian Walter,Ben Weiner,Axel Weiss,Stijn Wuyts +35 more
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TLDR
In this article, the scaling relations of molecular gas depletion time scale (tdepl) and gas to stellar mass ratio (Mmolgas/M*) of star forming galaxies (SFGs) near the star formation main-sequence with redshift, specific star formation rate (sSFR) and stellar mass (M*) were investigated.Abstract:
We combine molecular gas masses inferred from CO emission in 500 star forming galaxies (SFGs) between z=0 and 3, from the IRAM-COLDGASS, PHIBSS1/2 and other surveys, with gas masses derived from Herschel far-IR dust measurements in 512 galaxy stacks over the same stellar mass/redshift range. We constrain the scaling relations of molecular gas depletion time scale (tdepl) and gas to stellar mass ratio (Mmolgas/M*) of SFGs near the star formation main-sequence with redshift, specific star formation rate (sSFR) and stellar mass (M*). The CO- and dust-based scaling relations agree remarkably well. This suggests that the CO-H2 mass conversion factor varies little within 0.6dex of the main sequence (sSFR(ms,z,M*)), and less than 0.3dex throughout this redshift range. This study builds on and strengthens the results of earlier work. We find that tdepl scales as (1+z)^-0.3 *(sSFR/sSFR(ms,z,M*))^-0.5, with little dependence on M*. The resulting steep redshift dependence of Mmolgas/M* ~(1+z)^3 mirrors that of the sSFR and probably reflects the gas supply rate. The decreasing gas fractions at high M* are driven by the flattening of the SFR-M* relation. Throughout the redshift range probed a larger sSFR at constant M* is due to a combination of an increasing gas fraction and a decreasing depletion time scale. As a result galaxy integrated samples of the Mmolgas-SFR rate relation exhibit a super-linear slope, which increases with the range of sSFR. With these new relations it is now possible to determine Mmolgas with an accuracy of 0.1dex in relative terms, and 0.2dex including systematic uncertainties.read more
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TL;DR: In this paper, the authors acknowledge support from the FP7 Career Integration Grant “eEASy” (CIG 321913), LZ acknowledges support from ASI/INAF grant I/037/12/0 and CF acknowledges funding from the European Union Horizon 2020 research and innovation programme under the Marie SklodowskaCurie grant agreement No 664931.
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