TY - JOUR AB - We discuss the nature and physical properties of gas-mass selected galaxies in the ALMA spectroscopic survey (ASPECS) of the Hubble Ultra Deep Field (HUDF). We capitalize on the deep optical integral-field spectroscopy from the Multi Unit Spectroscopic Explorer (MUSE) HUDF Survey and multiwavelength data to uniquely associate all 16 line emitters, detected in the ALMA data without preselection, with rotational transitions of carbon monoxide (CO). We identify 10 as CO(2–1) at 1 < z < 2, 5 as CO(3–2) at 2 < z < 3, and 1 as CO(4–3) at z = 3.6. Using the MUSE data as a prior, we identify two additional CO(2–1) emitters, increasing the total sample size to 18. We infer metallicities consistent with (super-)solar for the CO-detected galaxies at z ≤ 1.5, motivating our choice of a Galactic conversion factor between CO luminosity and molecular gas mass for these galaxies. Using deep Chandra imaging of the HUDF, we determine an X-ray AGN fraction of 20% and 60% among the CO emitters at z ∼ 1.4 and z ∼ 2.6, respectively. Being a CO-flux-limited survey, ASPECS-LP detects molecular gas in galaxies on, above, and below the main sequence (MS) at z ∼ 1.4. For stellar masses ≥1010 (1010.5) ${M}_{\odot }$, we detect about 40% (50%) of all galaxies in the HUDF at 1 < z < 2 (2 < z < 3). The combination of ALMA and MUSE integral-field spectroscopy thus enables an unprecedented view of MS galaxies during the peak of galaxy formation. AU - Boogaard, Leindert A. AU - Decarli, Roberto AU - González-López, Jorge AU - van der Werf, Paul AU - Walter, Fabian AU - Bouwens, Rychard AU - Aravena, Manuel AU - Carilli, Chris AU - Bauer, Franz Erik AU - Brinchmann, Jarle AU - Contini, Thierry AU - Cox, Pierre AU - da Cunha, Elisabete AU - Daddi, Emanuele AU - Díaz-Santos, Tanio AU - Hodge, Jacqueline AU - Inami, Hanae AU - Ivison, Rob AU - Maseda, Michael AU - Matthee, Jorryt J AU - Oesch, Pascal AU - Popping, Gergö AU - Riechers, Dominik AU - Schaye, Joop AU - Schouws, Sander AU - Smail, Ian AU - Weiss, Axel AU - Wisotzki, Lutz AU - Bacon, Roland AU - Cortes, Paulo C. AU - Rix, Hans-Walter AU - Somerville, Rachel S. AU - Swinbank, Mark AU - Wagg, Jeff ID - 11514 IS - 2 JF - The Astrophysical Journal KW - Space and Planetary Science KW - Astronomy and Astrophysics SN - 0004-637X TI - The ALMA spectroscopic survey in the HUDF: Nature and physical properties of gas-mass selected galaxies using MUSE spectroscopy VL - 882 ER -