TY - JOUR
T1 - The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field
T2 - Multiband Constraints on Line-luminosity Functions and the Cosmic Density of Molecular Gas
AU - Decarli, Roberto
AU - Aravena, Manuel
AU - Boogaard, Leindert
AU - Carilli, Chris
AU - González-López, Jorge
AU - Walter, Fabian
AU - Cortes, Paulo C.
AU - Cox, Pierre
AU - Cunha, Elisabete Da
AU - Daddi, Emanuele
AU - Díaz-Santos, Tanio
AU - Hodge, Jacqueline A.
AU - Inami, Hanae
AU - Neeleman, Marcel
AU - Novak, Mladen
AU - Oesch, Pascal
AU - Popping, Gergö
AU - Riechers, Dominik
AU - Smail, Ian
AU - Uzgil, Bade
AU - Werf, Paul Van Der
AU - Wagg, Jeff
AU - Weiss, Axel
PY - 2020/10/20
Y1 - 2020/10/20
N2 - We present a CO and atomic fine-structure line-luminosity function analysis using the ALMA Spectroscopic Survey (ASPECS) in the Hubble Ultra Deep Field. ASPECS consists of two spatially overlapping mosaics that cover the entire ALMA 3 mm and 1.2 mm bands. We combine the results of a line-candidate search of the 1.2 mm data cube with those previously obtained from the 3 mm cube. Our analysis shows that ∼80% of the line flux observed at 3 mm arises from CO(2-1) or CO(3-2) emitters at z = 1-3 ("cosmic noon"). At 1.2 mm, more than half of the line flux arises from intermediate-J CO transitions (J up = 3-6); ∼12% from neutral carbon lines; and <1% from singly ionized carbon, [C ii]. This implies that future [C ii] intensity mapping surveys in the epoch of reionization will need to account for a highly significant CO foreground. The CO luminosity functions probed at 1.2 mm show a decrease in the number density at a given line luminosity (in units of L′) at increasing J up and redshift. Comparisons between the CO luminosity functions for different CO transitions at a fixed redshift reveal subthermal conditions on average in galaxies up to z ∼ 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, ρ H2, shows a redshift evolution with an increase from high redshift up to z ∼ 1.5 followed by a factor ∼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.
AB - We present a CO and atomic fine-structure line-luminosity function analysis using the ALMA Spectroscopic Survey (ASPECS) in the Hubble Ultra Deep Field. ASPECS consists of two spatially overlapping mosaics that cover the entire ALMA 3 mm and 1.2 mm bands. We combine the results of a line-candidate search of the 1.2 mm data cube with those previously obtained from the 3 mm cube. Our analysis shows that ∼80% of the line flux observed at 3 mm arises from CO(2-1) or CO(3-2) emitters at z = 1-3 ("cosmic noon"). At 1.2 mm, more than half of the line flux arises from intermediate-J CO transitions (J up = 3-6); ∼12% from neutral carbon lines; and <1% from singly ionized carbon, [C ii]. This implies that future [C ii] intensity mapping surveys in the epoch of reionization will need to account for a highly significant CO foreground. The CO luminosity functions probed at 1.2 mm show a decrease in the number density at a given line luminosity (in units of L′) at increasing J up and redshift. Comparisons between the CO luminosity functions for different CO transitions at a fixed redshift reveal subthermal conditions on average in galaxies up to z ∼ 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, ρ H2, shows a redshift evolution with an increase from high redshift up to z ∼ 1.5 followed by a factor ∼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.
UR - http://www.scopus.com/inward/record.url?scp=85094605468&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/abaa3b
DO - 10.3847/1538-4357/abaa3b
M3 - Article
AN - SCOPUS:85094605468
VL - 902
JO - The Astrophysical Journal
JF - The Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 110
ER -