The ALMA Spectroscopic Survey in the HUDF: A Search for [C ii] Emitters at 6 ? z ? 8

Abstract The Atacama Large Millimeter/submillimeter Array (ALMA) Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Band 6 scan (212–272 GHz) covers potential [C ii ] emission galaxies at ? z 8 throughout a 2.9 arcmin 2 area. By selecting on known Ly ? emitters (LAEs) and photometric dropout field, we perform targeted searches down to 5 ? luminosity depth L II ? 2.0 × 10 ? , corresponding roughly star formation rates (SFRs) of 10–20 M yr ?1 when applying locally calibrated conversion for star-forming galaxies, yielding zero detections. While majority this sample are characterized by lower SFRs, resulting upper limits these sources consistent with current literature ALMA observations = 6–7 LAEs Lyman-break (LBGs), as well relations between SFR—with exception single ]-deficient, UV-luminous LBG. We also blind search ]-bright that may have been missed optical selections, an limit cumulative number density > (5 ) be less than 1.8 ?4 Mpc ?3 (90% confidence level). At volume coverage, present observed evolution function from 6–8 0 comparing ASPECS measurement results redshift.