Alma spectroscopic survey in the hubble ultra deep field: co luminosity functions and the evolution of the cosmic density of molecular gas
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Fecha
2016-12
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
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Título del volumen
Editor
Institute of Physics Publishing
Nombre de Curso
Licencia CC
Atribution 4.0 International (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
In this paper we use ASPECS, the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field in band 3 and
band 6, to place blind constraints on the CO luminosity function and the evolution of the cosmic molecular gas
density as a function of redshift up to z ∼ 4.5. This study is based on galaxies that have been selected solely
through their CO emission and not through any other property. In all of the redshift bins the ASPECS
measurements reach the predicted “knee” of the CO luminosity function (around 5 × 109 K km s−1 pc2
). We find
clear evidence of an evolution in the CO luminosity function with respect to z ∼ 0, with more CO-luminous
galaxies present at z ∼ 2. The observed galaxies at z ∼ 2 also appear more gas-rich than predicted by recent semi analytical models. The comoving cosmic molecular gas density within galaxies as a function of redshift shows a
drop by a factor of 3–10 from z ∼ 2 to z ∼ 0 (with significant error bars), and possibly a decline at z > 3. This
trend is similar to the observed evolution of the cosmic star formation rate density. The latter therefore appears to
be at least partly driven by the increased availability of molecular gas reservoirs at the peak of cosmic star
formation (z ∼ 2).
Notas
Indexación Scopus.
Palabras clave
Galaxies: Evolution, Galaxies: Formation, Galaxies: High-Redshift, Galaxies: ISM, Surveys
Citación
Astrophysical Journal. Open Access. Volume 833, Issue 1. 10 December 2016. Article number 69
DOI
10.3847/1538-4357/833/1/69