The EDGE-CALIFA survey: The influence of galactic rotation on the molecular depletion time across the Hubble sequence

D. Colombo, V. Kalinova, D. Utomo, E. Rosolowsky, A. D. Bolatto, R. C. Levy, T. Wong, S. F. Sanchez, A. K. Leroy, E. Ostriker, L. Blitz, S. Vogel, D. Mast, R. García-Benito, B. Husemann, H. Dannerbauer, L. Ellmeier, Y. Cao

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

We present a kpc-scale analysis of the relationship between the molecular depletion time (τdepmol ) and the orbital time (τorb) across the field of 39 face-on local galaxies, selected from the EDGE-CALIFA sample. We find that, on average, 5 per cent of the available molecular gas is converted into stars per orbital time, or τ depmol ~ 20 τorb. The resolved relation shows a scatter of ~0.5 dex. The scatter is ascribable to galaxies of different morphologies that follow different τ depmolorb relations which decrease in steepness from early- to late types. The morphologies appear to be linked with the star formation rate surface density, the molecular depletion time, and the orbital time, but they do not correlate with the molecular gas content of the galaxies in our sample.We speculate that in our molecular gas rich, early-type galaxies, the morphological quenching (in particular the disc stabilization via shear), rather than the absence of molecular gas, is the main factor responsible for their current inefficient star formation.

Original languageEnglish (US)
Pages (from-to)1791-1808
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume475
Issue number2
DOIs
StatePublished - Apr 1 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Galaxies: evolution
  • Galaxies: kinematics and dynamics
  • Galaxies: star formation
  • Galaxies: structure
  • ISM: molecules

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    Colombo, D., Kalinova, V., Utomo, D., Rosolowsky, E., Bolatto, A. D., Levy, R. C., Wong, T., Sanchez, S. F., Leroy, A. K., Ostriker, E., Blitz, L., Vogel, S., Mast, D., García-Benito, R., Husemann, B., Dannerbauer, H., Ellmeier, L., & Cao, Y. (2018). The EDGE-CALIFA survey: The influence of galactic rotation on the molecular depletion time across the Hubble sequence. Monthly Notices of the Royal Astronomical Society, 475(2), 1791-1808. https://doi.org/10.1093/MNRAS/STX3233