The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Multiband Constraints on Line-luminosity Functions and the Cosmic Density of Molecular Gas

Abstract

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The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: CO Excitation and Atomic Carbon in Star-forming Galaxies at z = 1–3

“…The Band6 data cube spans from 212-272 GHz, and was resampled at a channel width of 15.627 MHz, corresponding to Δv≈ 19.4 km s −1 at 242 GHz. The naturally weighted cube has a beam size of ≈1 5×1 1 and reaches an average rms depth of ≈0.5 mJy beam −1 per channel (see Decarli et al 2020, Figure 1).…”

“…Our method forces all lines for a source to a common line width, which may result in different error bars for some lines than found based on an S/N optimized extraction of each individual line (González-López et al 2019;Riechers et al 2020). This more conservative treatment, which is chosen to minimize biases for the specific analysis carried out in this work, differs from the way they are used in other works in ASPECS focused on studies of the global gas density evolution (Decarli et al 2019;Decarli et al 2020;Riechers et al 2020). Compared to the previous ASPECS papers, we find that our fluxes in Band 3 are on average 20% lower than those from González-López et al 2019, but consistent with Decarli et al (2016b, for a small subset of the sources).…”

“…, to date (Decarli et al 2016a(Decarli et al , 2019(Decarli et al , 2020. This relies on the excitation corrections from the J2 lines back to CO(1-0).…”

“…In summary, we make new recommendations for the average CO ladders to be used for the measurement of the cosmic molecular gas density (the two-component models from Table 3). The constraints on ( ) r z H 2 using the new excitation corrections are presented and discussed in Decarli et al (2020). Our results, combined with those of Riechers et al (2020), show that direct measurement of the CO(1-0) transition (where accessible) as well as constructing more complete CO ladders, in order to characterize the CO excitation and physical 30 Daddi et al (2015) did not measure the excitation in CO(4-3), but interpolating their CO ladder yields r 41 =0.31±0.06 (see Decarli et al 2016b).…”

“…ASPECS is a flux-limited survey, designed to detect CO in galaxies without preselection. It thereby provides the most complete inventory of the cosmic molecular gas density, ( ) r z H 2 , to date (Decarli et al 2016a(Decarli et al , 2019(Decarli et al , 2020. The galaxies detected in CO by ASPECS are found to lie on, above, and below the main sequence at z=1-3, with near-solar metallicities (Aravena et al 2019;Boogaard et al 2019).…”