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

We present a kpc-scale analysis of the relationship between the molecular depletion time (τ ) and the orbital time (τ) 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...

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Detalles Bibliográficos
Autores: 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, Leo, Vogel, S., Mast, D., García-Benito, Rubén, Husemann, B., Dannerbauer, H., Ellmeier, L., Cao, Y.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/207445
Acceso en línea:http://hdl.handle.net/10261/207445
Access Level:acceso abierto
Palabra clave:Galaxies: evolution
Galaxies: kinematics and dynamics
Galaxies: star formation
Galaxies: structure
ISM: molecules
Descripción
Sumario:We present a kpc-scale analysis of the relationship between the molecular depletion time (τ ) and the orbital time (τ) 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 ~ 20 τ. The resolved relation shows a scatter of ~0.5 dex. The scatter is ascribable to galaxies of different morphologies that follow different τ -τ 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. © 2017 The Author(s).

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