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The ALMASpectroscopic Surveyin the Hubble UltraDeep Field: MultibandConstraints onLine-luminosityFunctions and theCosmic Density ofMolecular Gas Roberto DecarliM. AravenaLeindert Boogaard2020 год

The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Multiband Constraints on Line-luminosity Functions and the Cosmic Density of Molecular Gas
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Аннотация: We present a CO and atomic fine-structure line luminosity function analysis using the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS). ASPECS consists of two spatially-overlapping mosaics that cover the entire ALMA 3mm and 1.2mm bands. We combine the results of a line candidate search of the 1.2mm data cube with those previously obtained from the 3mm cube. Our analysis shows that $\sim$80% of the line flux observed at 3mm arises from CO(2-1) or CO(3-2) emitters at $z$=1-3 (`cosmic noon'). At 1.2mm, more than half of the line flux arises from intermediate-J CO transitions ($J_{\rm up}$=3-6); $\sim12$% from neutral carbon lines; and $< 1$% from singly-ionized carbon, [CII]. This implies that future [CII] intensity mapping surveys in the epoch of reionization will need to account for a highly significant CO foreground. The CO luminosity functions probed at 1.2mm show a decrease in the number density at a given line luminosity (in units of $L'$) at increasing $J_{\rm up}$ and redshift. Comparisons between the CO luminosity functions for different CO transitions at a fixed redshift reveal sub-thermal conditions on average in galaxies up to $z\sim 4$. In addition, the comparison of the CO luminosity functions for the same transition at different redshifts reveals that the evolution is not driven by excitation. The cosmic density of molecular gas in galaxies, $\rho_{\rm H2}$, shows a redshift evolution with an increase from high redshift up to $z\sim1.5$ followed by a factor $\sim 6$ drop down to the present day. This is in qualitative agreement with the evolution of the cosmic star-formation rate density, suggesting that the molecular gas depletion time is approximately constant with redshift, after averaging over the star-forming galaxy population.
Год издания: 2020
Авторы: Roberto Decarli, M. Aravena, Leindert Boogaard, C. L. Carilli, Jorge González-López, Fabian Walter, Paulo C. Cortés, P. Cox, Elisabete da Cunha, E. Daddi, T. Díaz-Santos, Jacqueline Hodge, Hanae Inami, Marcel Neeleman, Mladen Novak, Pascal A. Oesch, Gergö Popping, Dominik A. Riechers, Ian Smail, Bade Uzgil, P. van der Werf, Jeff Wagg, A. Weiß
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: Galaxies: Formation, Evolution, Phenomena, Astrophysics and Star Formation Studies, Cosmology and Gravitation Theories
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