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The ALPINE-ALMA [C II] survey. Dust attenuation properties and obscured star formation at z ∼ 4.4–5.8

Fudamoto, Y. and Oesch, P. A. and Faisst, A. and Béthermin, M. and Ginolfi, M. and Khusanova, Y. and Loiacono, F. and Le Fèvre, O. and Capak, P. and Schaerer, D. and Silverman, J. D. and Cassata, P. and Yan, L. and Amorin, R. and Bardelli, S. and Boquien, M. and Cimatti, A. and Dessauges-Zavadsky, M. and Fujimoto, S. and Gruppioni, C. and Hathi, N. P. and Ibar, E. and Jones, G. C. and Koekemoer, A. M. and Lagache, G. and Lemaux, B. C. and Maiolino, R. and Narayanan, D. and Pozzi, F. and Riechers, D. A. and Rodighiero, G. and Talia, M. and Toft, S. and Vallini, L. and Vergani, D. and Zamorani, G. and Zucca, E. (2020) The ALPINE-ALMA [C II] survey. Dust attenuation properties and obscured star formation at z ∼ 4.4–5.8. Astronomy and Astrophysics, 643 . Art. No. A4. ISSN 0004-6361.

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We present dust attenuation properties of spectroscopically confirmed star forming galaxies on the main sequence at a redshift of ∼4.4 − 5.8. Our analyses are based on the far infrared continuum observations of 118 galaxies at rest-frame 158 μm obtained with the Atacama Large Millimeter Array (ALMA) Large Program to INvestigate [C II] at Early times (ALPINE). We study the connection between the ultraviolet (UV) spectral slope (β), stellar mass (M⋆), and infrared excess (IRX = L_(IR)/L_(UV)). Twenty-three galaxies are individually detected in the continuum at > 3.5σ significance. We perform a stacking analysis using both detections and nondetections to study the average dust attenuation properties at z ∼ 4.4 − 5.8. The individual detections and stacks show that the IRX–β relation at z ∼ 5 is consistent with a steeper dust attenuation curve than typically found at lower redshifts (z <  4). The attenuation curve is similar to or even steeper than that of the extinction curve of the Small Magellanic Cloud. This systematic change of the IRX–β relation as a function of redshift suggests an evolution of dust attenuation properties at z >  4. Similarly, we find that our galaxies have lower IRX values, up to 1 dex on average, at a fixed mass compared to previously studied IRX–M⋆ relations at z ≲ 4, albeit with significant scatter. This implies a lower obscured fraction of star formation than at lower redshifts. Our results suggest that dust properties of UV-selected star forming galaxies at z ≳ 4 are characterised by (i) a steeper attenuation curve than at z ≲ 4, and (ii) a rapidly decreasing dust obscured fraction of star formation as a function of redshift. Nevertheless, even among this UV-selected sample, massive galaxies (log M⋆/M⊙ >  10) at z ∼ 5 − 6 already exhibit an obscured fraction of star formation of ∼45%, indicating a rapid build-up of dust during the epoch of reionization.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Fudamoto, Y.0000-0001-7440-8832
Oesch, P. A.0000-0001-5851-6649
Faisst, A.0000-0002-9382-9832
Béthermin, M.0000-0002-3915-2015
Ginolfi, M.0000-0002-8231-821X
Khusanova, Y.0000-0002-7220-397X
Loiacono, F.0000-0002-8858-6784
Le Fèvre, O.0000-0001-5891-2596
Capak, P.0000-0003-3578-6843
Schaerer, D.0000-0001-7144-7182
Silverman, J. D.0000-0002-0000-6977
Cassata, P.0000-0002-6716-4400
Yan, L.0000-0003-1710-9339
Amorin, R.0000-0001-5758-1000
Bardelli, S.0000-0002-8900-0298
Boquien, M.0000-0003-0946-6176
Cimatti, A.0000-0002-4409-5633
Dessauges-Zavadsky, M.0000-0003-0348-2917
Fujimoto, S.0000-0001-7201-5066
Gruppioni, C.0000-0002-5836-4056
Hathi, N. P.0000-0001-6145-5090
Jones, G. C.0000-0002-0267-9024
Koekemoer, A. M.0000-0002-6610-2048
Lagache, G.0000-0003-1492-2519
Lemaux, B. C.0000-0002-1428-7036
Maiolino, R.0000-0002-4985-3819
Narayanan, D.0000-0002-7064-4309
Pozzi, F.0000-0002-7412-647X
Riechers, D. A.0000-0001-9585-1462
Rodighiero, G.0000-0002-9415-2296
Talia, M.0000-0003-4352-2063
Toft, S.0000-0003-3631-7176
Vallini, L.0000-0002-3258-3672
Vergani, D.0000-0003-0898-2216
Zamorani, G.0000-0002-2318-301X
Zucca, E.0000-0002-5845-8132
Additional Information:© 2020 ESO. Article published by EDP Sciences. Received 14 April 2020; Accepted 22 September 2020; Published online 27 October 2020. This paper is dedicated to the memory of Olivier Le Fèvre, PI of the ALPINE survey. We thank the anonymous referee for insightful comments that improved the quality of this manuscript. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2017.1.00428.L. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC 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. Based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under ESO programme ID 179.A-2005 and on data products produced by TERAPIX and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium. This work was supported by the Swiss National Science Foundation through the SNSF Professorship grant 157567 “Galaxy Build-up at Cosmic Dawn”. G.C.J. acknowledges ERC Advanced Grant 695671 “QUENCH” and support by the Science and Technology Facilities Council (STFC). D.R. acknowledges support from the National Science Foundation under grant number AST-1614213 and from the Alexander von Humboldt Foundation through a Humboldt Research Fellowship for Experienced Researchers. A.C., F.P. and M.T. acknowledge the grant MIUR PRIN2017. LV acknowledges funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant agreement No. 746119. S.F. is supported by and the Cosmic Dawn Center of Excellence funded by the Danish National Research Foundation under then grant No. 140. R.A. acknowledges support from FONDECYT Regular Grant 1202007.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)157567
European Research Council (ERC)695671
Science and Technology Facilities Council (STFC)UNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)UNSPECIFIED
Marie Curie Fellowship746119
Danish National Research Foundation140
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1202007
Subject Keywords:galaxies: high-redshift – galaxies: ISM – dust, extinction
Record Number:CaltechAUTHORS:20201028-150838971
Persistent URL:
Official Citation:The ALPINE-ALMA [C II] survey - Dust attenuation properties and obscured star formation at z ∼ 4.4–5.8. Y. Fudamoto, P. A. Oesch, A. Faisst, M. Béthermin, M. Ginolfi, Y. Khusanova, F. Loiacono, O. Le Fèvre, P. Capak, D. Schaerer, J. D. Silverman, P. Cassata, L. Yan, R. Amorin, S. Bardelli, M. Boquien, A. Cimatti, M. Dessauges-Zavadsky, S. Fujimoto, C. Gruppioni, N. P. Hathi, E. Ibar, G. C. Jones, A. M. Koekemoer, G. Lagache, B. C. Lemaux, R. Maiolino, D. Narayanan, F. Pozzi, D. A. Riechers, G. Rodighiero, M. Talia, S. Toft, L. Vallini, D. Vergani, G. Zamorani and E. Zucca A&A, 643 (2020) A4; DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106341
Deposited By: Tony Diaz
Deposited On:29 Oct 2020 15:48
Last Modified:29 Oct 2020 16:58

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