VALES V: a kinematic analysis of the molecular gas content inH-ATLAS galaxies atz ∼ 0.03–0.35 using ALMA

Autor: C. Yang, A. M. Swinbank, G. de Zotti, A. M. Muñoz-Arancibia, Maarten Baes, Franz E. Bauer, Andres Escala, Stephen Anthony Eales, G. Orellana, Roger Leiton, Michał J. Michałowski, Duncan Farrah, Cheng Cheng, Juan Molina, Thomas M. Hughes, Maritza A. Lara-López, V. Villanueva, Manuel Aravena, Loretta Dunne, P. van der Werf, Hugo Messias, Edo Ibar
Rok vydání: 2018
Předmět:
METALLICITY GRADIENTS
INFRARED-EMISSION
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
01 natural sciences
Submillimeter Array
Gravitational energy
C-II LINE
kinematics and dynamics [galaxies]
0103 physical sciences
STAR-FORMING GALAXIES
NEARBY GALAXIES
PHYSICAL CONDITIONS
Emission spectrum
10. No inequality
010303 astronomy & astrophysics
evolution [galaxies]
Astrophysics::Galaxy Astrophysics
Physics
Spiral galaxy
ISM [galaxies]
INTERSTELLAR-MEDIUM
010308 nuclear & particles physics
Star formation
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Galaxy
Interstellar medium
Physics and Astronomy
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
STABILITY-CRITERION
Astrophysics::Earth and Planetary Astrophysics
star formation [galaxies]
ANGULAR-MOMENTUM
Energy source
SPIRAL GALAXIES
Zdroj: Monthly Notices of the RAS (0035-8711)
Monthly notices of the Royal Astronomical Society, 2018, Vol.482(2), pp.1499-1524 [Peer Reviewed Journal]
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the RAS (0035-8711), 482(2), 1499-1524
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Molina, J, Ibar, E, Villanueva, V, Escala, A, Cheng, C, Baes, M, Messias, H, Yang, C, Bauer, F E, van der Werf, Leiton, R, Aravena, M, Swinbank, A M, Michalowski, M J, Munoz-Arancibia, A M, Orellana, G, Hughes, T M, Farrah, D, De Zotti, G, Lara-Lopez, M A, Eales, S & Dunne, L 2019, ' VALES V : a kinematic analysis of the molecular gas content in H-ATLAS galaxies at z similar to 0.03-0.35 using ALMA ', Monthly Notices of the Royal Astronomical Society, vol. 482, no. 2, pp. 1499-1524 . https://doi.org/10.1093/mnras/sty2577
ISSN: 1365-2966
0035-8711
Popis: We present Atacama Large Millimeter/submillimeter Array (ALMA) resolved observations of molecular gas in galaxies up to $z=0.35$ to characterise the role of global galactic dynamics on the global interstellar medium (ISM) properties. These observations consist of a sub-sample of 39 galaxies taken from the Valpara\'iso ALMA Line Emission Survey (VALES). From the CO($J=1-0)$ emission line, we quantify the kinematic parameters by modelling the velocity fields. We find that the IR luminosity increases with the rotational to dispersion velocity ratio ($V_{\rm rot}/\sigma_v$, corrected for inclination). We find a dependence between $V_{\rm rot}/\sigma_v$ and the [CII]/IR ratio, suggesting that the so-called `[CII] deficit' is related to the dynamical state of the galaxies. We find that global pressure support is needed to reconcile the dynamical mass estimates with the stellar masses in our systems with low $V_{\rm rot}/\sigma_v$ values. The star formation rate (SFR) is weakly correlated with the molecular gas fraction ($f_{\rm H_2}$) in our sample, suggesting that the release of gravitational energy from cold gas may not be the main energy source of the turbulent motions seen in the VALES galaxies. By defining a proxy of the `star formation efficiency' parameter as the SFR divided by the CO luminosity (SFE$'\equiv$ SFR/L$'_{\rm CO}$), we find a constant SFE$'$ per crossing time ($t_{\rm cross}$). We suggest that $t_{\rm cross}$ may be the controlling timescale in which the star formation occurs in dusty $z\sim0.03-0.35$ galaxies.
Comment: Accepted for publication in MNRAS. 28 pages, 15 figures, 2 Tables
Databáze: OpenAIRE
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