The ALMA Patchy Deep Survey: a blind search for [C II] emitters at z ∼ 4.5
Abstract
We present a result of a blind search for [C II] 158 μm emitters at z ∼ 4.5 using Atacama Large Millimeter Array (ALMA) Cycle 0 archival data. We collected extragalactic 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 h. We searched for line emitters in continuum-subtracted data cubes with spectral resolutions of ∼50, 100, 300 and 500 km s-1. We could not detect any new line emitters above a 6σ significance level. This result provides upper limits to the [C II] luminosity function at z ∼ 4.5 over L_[C II] ∼ 10^8-10^{10} L_{⊙} or star formation rate, SFR ∼ 10-1000 M_^{⊙}yr-1. These limits are at least two orders of magnitude larger than the [C II] luminosity functions expected from the z ∼ 4 UV luminosity function or from numerical simulation. However, this study demonstrates that we would be able to better constrain the [C II] 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- July 2015
- DOI:
- 10.1093/mnras/stv1044
- arXiv:
- arXiv:1505.02244
- Bibcode:
- 2015MNRAS.451.1141M
- Keywords:
-
- galaxies: formation;
- cosmology: observations;
- early Universe;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 6 pages, 3 figures, accepted for publication in MNRAS