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The ALPINE-ALMA [CII] survey: Survey strategy, observations and sample properties of 118 star-forming galaxies at $4 < z < 6$

O. Le Fèvre 1 M. Béthermin 1 A. Faisst 2 G.C. Jones 3 P. Capak 2, 4 P. Cassata 5 J.D. Silverman 6 D. Schaerer 7 L. Yan 2 R. Amorin 8 S. Bardelli 9 M. Boquien 10 A. Cimatti 11 M. Dessauges-Zavadsky 12 M. Giavalisco 13 N.P. Hathi 13 Y. Fudamoto 12, 14 S. Fujimoto 14 M. Ginolfi 12 C. Gruppioni 9 S. Hemmati 4 E. Ibar 15 A. Koekemoer 13 Y. Khusanova 1 G. Lagache 1 B.C. Lemaux 16 F. Loiacono 9 R. Maiolino 3 C. Mancini 5 D. Narayanan 17 L. Morselli 18 Hugo Méndez-Hernàndez 15 P.A. Oesch 12 F. Pozzi 19 M. Romano 18 D. Riechers 20, 21 N. Scoville 2 M. Talia 9 L.A.M. Tasca 1 R. Thomas 22 S. Toft 4 L. Vallini 23 D. Vergani 9 F. Walter 2 G. Zamorani 9 E. Zucca 9, 24, 14
Abstract : The ALMA-ALPINE [CII] survey is aimed at characterizing the properties of a sample of normal star-forming galaxies (SFGs). The ALMA Large Program to INvestigate (ALPINE) features 118 galaxies observed in the [CII]-158 μm line and far infrared (FIR) continuum emission during the period of rapid mass assembly, right after the end of the HI reionization, at redshifts of 4 <  z <  6. We present the survey science goals, the observational strategy, and the sample selection of the 118 galaxies observed with ALMA, with an average beam minor axis of about 0.85″, or ∼5 kpc at the median redshift of the survey. The properties of the sample are described, including spectroscopic redshifts derived from the UV-rest frame, stellar masses, and star-formation rates obtained from a 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 in the main sequence at these redshifts. The overall detection rate in [CII] is 64% for a signal-to-noise ratio (S/N) threshold larger than 3.5 corresponding to a 95% purity (40% detection rate for S/N >  5). Based on 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% that are mergers, 20% extended and dispersion-dominated, 13% compact, and 11% rotating discs, with the remaining 16% 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, those of galaxy mergers. This paper sets a reference sample for the gas distribution in normal SFGs at 4 <  z <  6, a key epoch in galaxy assembly, which is ideally suited for studies with future facilities, such as the James Webb Space Telescope (JWST) and the Extremely Large Telescopes (ELTs).Key words: galaxies: evolution / galaxies: star formation / galaxies: formation
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Submitted on : Friday, November 27, 2020 - 10:13:33 AM
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O. Le Fèvre, M. Béthermin, A. Faisst, G.C. Jones, P. Capak, et al.. The ALPINE-ALMA [CII] survey: Survey strategy, observations and sample properties of 118 star-forming galaxies at $4 < z < 6$. Astron.Astrophys., 2020, 643, pp.A1. ⟨10.1051/0004-6361/201936965⟩. ⟨hal-02432539⟩

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