http://arxiv.org/abs/1910.09517
The ALMA-ALPINE [CII] survey (A2C2S) aims at characterizing the properties of a sample of normal star-forming galaxies (SFGs). ALPINE, the ALMA Large Program to INvestigate 118 galaxies observed in the [CII]-158$\mu$m line and far Infrared (FIR) continuum emission in the period of rapid mass assembly, right after HI reionization ended, at redshifts 4<z<6. We present the survey science goals, the observational strategy and the sample selection of the 118 galaxies observed with ALMA, with a typical beam size of about 0.7\arcsec, or $<$ 6 kpc at the median redshift of the survey.
The properties of the sample are described, including spectroscopic redshifts derived from UV-rest frame, stellar masses and star-formation rates obtained from spectral energy distribution (SED) fitting. The observed properties derived from the ALMA data are presented and discussed in terms of the overall detection rate in [CII] and FIR continuum, with the observed signal-to-noise distribution. The sample is representative of the SFG population on the main sequence at these redshifts. The overall detection rate in [CII] is 64\%. From a visual inspection of the [CII] data cubes together with the large wealth of ancillary data we find a surprisingly wide range of galaxy types, including 40\% mergers, 20\% extended and dispersion dominated, 13\% compact and 11\% rotating discs, the remaining 16\% being too faint to be classified. This diversity indicates that a wide array of physical processes must be at work at this epoch, first and foremost galaxy merging. This paper sets a reference sample for the gas distribution in normal SFGs at 4<z<6, a key epoch in galaxy assembly, ideally suited for studies with future facilities like the James Webb Space Telescope and extremely large telescopes.
O. Fèvre, M. Béthermin, A. Faisst, et. al.
Tue, 22 Oct 19
68/91
Comments: submitted to A\&A
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