VALES VI: ISM enrichment in star-forming galaxies up to z similar to 0.2 using (CO)-C-12(1-0), (CO)-C-13(1-0), and (CO)-O-18(1-0) line luminosity ratios
Artikel i vetenskaplig tidskrift, 2020

We present Atacama Large Millimeter/sub-millimeter Array (ALMA) observations towards 27 low-redshift (0.02< z< 0.2) starforming galaxies taken from the Valpara ' iso ALMA/APEX Line Emission Survey. We perform stacking analyses of the (CO)-C-12(1-0), (CO)-C-13(1-0), and (CO)-O-18(1-0) emission lines to explore the L' [(CO)-C-12(1-0)]/L' [(CO)-C-13(1-0)] [hereafter L' ((CO)-C-12)/L' ((CO)-C-13)] and L' [(CO)-C-13(1-0)]/L' [(CO)-O-18(1-0)] [hereafter L' ((CO)-C-13)/L' ((CO)-O-18)] line luminosity ratio dependence as a function of different global galaxy parameters related to the star formation activity. The sample has far-IR luminosities of 1010.1-11.9 L and stellar masses of 109.8-10.9M(circle dot) corresponding to typical star-forming and starburst galaxies at these redshifts. On average, we find an L' (12CO)/L' ((CO)-C-13) line luminosity ratio value of 16.1 +/- 2.5. Galaxies with pieces of evidence of possible merging activity tend to show higher L' ((CO)-C-12)/L' (13CO) ratios by a factor of 2, while variations of this order are also found in galaxy samples with higher star formation rates (SFRs) or star formation efficiencies (SFEs). We also find an average L' ((CO)-C-13)/L' ((CO)-O-18) line luminosity ratio of 2.5 +/- 0.6, which is in good agreement with those previously reported for starburst galaxies. We find that galaxy samples with high LIR, SFR, and SFE show low L' ((CO)-C-13)/L' ((CO)-O-18) line luminosity ratios with high L' ((CO)-C-12)/L' ((CO)-C-13) line luminosity ratios, suggesting that these trends are produced by selective enrichment of massive stars in young starbursts.

techniques: interferometric

methods: statistical

galaxies: ISM

galaxies: star formation


H. Mendez-Hernandez

Universidad de Valparaíso

E. Ibar

Universidad de Valparaíso

Kirsten Kraiberg Knudsen

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Extragalaktisk astrofysik

P. Cassata

Osservatorio Astronomico di Padova

Università di Padova

M. Aravena

Universidad Diego Portales

M. J. Michalowski

Uniwersytet im. Adama Mickiewicza w Poznaniu

Zhi-Yu Zhang

Nanjing University

M. A. Lara-Lopez

Köpenhamns universitet

R. J. Ivison

European Southern Observatory Santiago

P. van der Werf

Universiteit Leiden

V. Villanueva

University of Maryland

R. Herrera-Camus

Universidad de Concepción

T. M. Hughes

Universidad de Valparaíso

University of Science and Technology of China

China Chile Joint Ctr Astron

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 497 3 2771-2785


Analytisk kemi

Astronomi, astrofysik och kosmologi




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