The ALPINE-ALMA [CII] survey: The population of [CII]-undetected galaxies and their role in the L_[CII]-SFR relation
- Creators
- Romano, M.
- Morselli, L.
- Cassata, P.
- Ginolfi, M.
- Schaerer, D.
- Béthermin, M.
- Capak, P.
- Faisst, A.
- Le Fèvre, O.
- Silverman, J. D.
- Yan, L.
- Bardelli, S.
- Boquien, M.
- Dessauges-Zavadsky, M.
- Fujimoto, S.
- Hathi, N. P.
- Jones, G. C.
- Koekemoer, A. M.
- Lemaux, B. C.
- Méndez-Hernández, H.
- Narayanan, D.
- Talia, M.
- Vergani, D.
- Zamorani, G.
- Zucca, E.
Abstract
The [CII] 158 μm emission line represents one of the most profitable tools for the investigation of the high-redshift galaxies in the early Universe so far. Being one of the brightest cooling lines in the rest-frame far-infrared regime of star-forming galaxies, it has been successfully exploited as a tracer of the star-formation rate (SFR) in local sources. The picture is more complex at higher redshifts, where its usability in this context is still under investigation. Recent results from the ALMA Large Program to INvestigate [CII] at Early times (ALPINE) survey suggest that there is no (or weak) evolution of the L[CII]-SFR relation up to z ∼ 6, but their reliability is hampered by the presence of a large population of [CII] nondetected galaxies. In this work, we characterize the population of [CII] nondetections in ALPINE. By stacking their ALMA spectra, we obtained a signal detected at ∼5.1σ, resulting in a [CII] luminosity of log(L_[CII]/L_⊙)∼7.8. When combining this value with those from the [CII] detections, we found a L_[CII]-SFR relation with a slope b = 1.14 ± 0.11, which is in agreement within the uncertainties both with the linear relation found in the local Universe and with the previous findings from ALPINE at z ∼ 5. This suggests that the [CII] line can be considered a good tracer of star formation up to the distant Universe. Finally, we show that the galaxies of our sample that deviate from the observed L_[CII]-SFR relation most could suffer from a less precise redshift estimation, perhaps artificially reducing their [CII] luminosity. In this respect, we claim that there is no evidence in favor of a deficit of [CII] content in high-z galaxies, in contrast with earlier studies.
Additional Information
© ESO 2022. Received 20 September 2021 / Accepted 4 February 2022. We warmly thank the anonymous referee for her/his careful reading of our paper and for the constructive comments and useful suggestions that have contributed to improve the quality of the work. This paper is based on data obtained with the ALMA Observatory, under Large Program 2017.1.00428.L. ALMA is a partnership of ESO (representing its member states), NSF(USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. M.R. acknowledges support from the Narodowe Centrum Nauki (UMO-2020/38/E/ST9/00077). M.T. acknowledges the support from grant PRIN MIUR 2017 20173ML3WW 001. This work was supported by the Programme National Cosmology et Galaxies (PNCG) of CNRS/INSU with INP and IN2P3, co-funded by CEA and CNES. The Cosmic Dawn Center is funded by the Danish National Research Foundation under grant No. 140. This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 847523 "INTERACTIONS". G.C.J. acknowledges ERC Advanced Grant 695671 "QUENCH" and support by the Science and Technology Facilities Council (STFC). M.B. gratefully acknowledges support by the ANID BASAL project FB210003 and from the FONDECYT regular grant 1211000. This paper is dedicated to the memory of Olivier Le Fèvre, PI of the ALPINE survey.Attached Files
Published - aa42265-21.pdf
Accepted Version - 2202.02334.pdf
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Additional details
- Eprint ID
- 114178
- Resolver ID
- CaltechAUTHORS:20220406-728382450
- UMO-2020/38/E/ST9/00077
- National Science Centre (Poland)
- 20173ML3WW 001
- Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)
- Programme National Cosmology et Galaxies (PNCG)
- Institut national des sciences de l'Univers (INSU)
- Centre National de la Recherche Scientifique (CNRS)
- Institut National du Patrimoine (INP)
- Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
- Commissariat a l'Energie Atomique (CEA)
- Centre National d'Études Spatiales (CNES)
- 140
- Danish National Research Foundation
- 847523
- Marie Curie Fellowship
- 695671
- European Research Council (ERC)
- Science and Technology Facilities Council (STFC)
- FB210003
- Agencia Nacional de Investigación y Desarrollo (ANID)
- 1211000
- Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)
- Created
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2022-04-06Created from EPrint's datestamp field
- Updated
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2022-04-07Created from EPrint's last_modified field