The ALMA Patchy Deep Survey: A blind search for [CII] emitters at z~4.5

Abstract

We present a result of a blind search for [CII] 158 $\mu$m emitters at $z\sim 4.5$ using ALMA Cycle~0 archival data. We collected extra-galactic data covering at 330-360 GHz (band~7) from 8 Cycle~0 projects from which initial results have been already published. The total number of fields is 243 and the total on-source exposure time is 19.2 hours. We searched for line emitters in continuum-subtracted data cubes with spectral resolutions of 50, 100, 300 and 500 km/s. We could not detect any new line emitters above a 6-$\sigma$ significance level. This result provides upper limits to the [CII] luminosity function at $z\sim 4.5$ over $L_{[\mathrm{CII}]}\sim 10^8-10^{10}{L}_{\odot }$ or star formation rate, SFR $\sim$ 10-1000 M${}_{{}^{\odot }}$/yr. These limits are at least 2 orders of magnitude larger than the [CII] luminosity functions expected from the $z\sim 4$ UV luminosity function or from numerical simulation. However, this study demonstrates that we would be able to better constrain the [CII] luminosity function and to investigate possible contributions from dusty galaxies to the cosmic star-formation rate density by collecting Cycle~1+2 archival data as the ALMA Patchy Deep Survey.

6 pages, 3 figures, accepted for publication in MNRAS

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• The ALMA Spectroscopic Survey in the HUDF: CO emission lines and 3 mm continuum sources
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• Constraining the evolution of CII intensity through the end stages of reionization
• ALMA Lensing Cluster Survey: Bright [CII] 158 $\mu$m Lines from a Multiply Imaged Sub-$L^{\star }$ Galaxy at $z=6.0719$
• The Local [CII] 158 um Emission Line Luminosity Function
• The ALMA Frontier Fields Survey III: 1.1 mm Emission Line Identifications in Abell 2744, MACSJ0416.1-2403, MACSJ1149.5+2223, Abell 370, and Abell S1063
• ALMA Deep Field in SSA22: Blindly Detected CO Emitters and [CII] Emitter Candidates
• Blind millimeter line emitter search using ALMA data toward gravitational lensing clusters
• Synergizing 21 cm and sub-millimetre surveys during reionization: new empirical insights
• ALMACAL VIII: A pilot survey for untargeted extragalactic CO emission lines in deep ALMA calibration data
• SXDF-UDS-CANDELS-ALMA 1.5 arcmin${}^2$ deep survey