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A new look at the infrared properties of z ∼ 5 galaxies

Sommovigo, L. and Ferrara, A. and Carniani, S. and Pallottini, A. and Dayal, P. and Pizzati, E. and Ginolfi, M. and Markov, V. and Faisst, A. (2022) A new look at the infrared properties of z ∼ 5 galaxies. Monthly Notices of the Royal Astronomical Society, 517 (4). pp. 5930-5941. ISSN 0035-8711. doi:10.1093/mnras/stac2997.

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Recent Atacama Large Millimeter Array large surveys unveiled the presence of significant dust continuum emission in star-forming galaxies at z > 4. Unfortunately, such large programs – i.e. ALPINE (z ∼ 5) and REBELS (z ∼ 7) – only provide us with a single far-infrared (FIR) continuum data point for their individual targets. Therefore, high-z galaxies FIR spectral energy densities (SEDs) remain mostly unconstrained, hinging on an assumption for their dust temperature (T_d) in the SED fitting procedure. This introduces uncertainties in the inferred dust masses (M_d), infrared luminosities (L_(IR)), and obscured star formation rate (SFR) fraction at z > 4. In this work, we use a method that allows us to constrain T_d with a single-band measurement by combining the 158 µm continuum information with the overlying [C ɪɪ emission line. We analyse the 21 [C ɪɪ and FIR continuum-detected z ∼ 5 galaxies in ALPINE, finding a range of T_d = 25–60 K and M_d = 0.6–25.1 × 10⁷ M_⊙. Given the measured stellar masses of ALPINE galaxies, the inferred dust yields are around M_d/M_⋆ = (0.2–8) × 10⁻³, consistent with theoretical dust-production constraints. We find that eight out of the 21 ALPINE galaxies have L_(IR) ≥ 10¹² L_⊙, comparable to ultraluminous IR galaxies (ULIRGs). Relying on ultraviolet-to-optical SED fitting, the SFR was underestimated by up to two orders of magnitude in four of these eight ULIRGs-like galaxies. We conclude that these four peculiar sources should be characterized by a two-phase interstellar medium structure with ‘spatially segregated’ FIR and ultraviolet emitting regions.

Item Type:Article
Related URLs:
URLURL TypeDescription
Sommovigo, L.0000-0002-2906-2200
Ferrara, A.0000-0002-9400-7312
Carniani, S.0000-0002-6719-380X
Pallottini, A.0000-0002-7129-5761
Pizzati, E.0000-0002-9712-0038
Ginolfi, M.0000-0002-9122-1700
Markov, V.0000-0002-5694-6124
Faisst, A.0000-0002-9382-9832
Additional Information:AF, AP, LS, and SC acknowledge support from the ERC Advanced Grant INTERSTELLAR H2020/740120 (PI: Ferrara). Any dissemination of results must indicate that it reflects only the author’s view and that the Commission is not responsible for any use that may be made of the information it contains. Partial support from the Carl Friedrich von Siemens-Forschungspreis der Alexander von Humboldt-Stiftung Research Award is kindly acknowledged (AF). PD acknowledges support from the ERC starting grant DELPHI StG-717001, from the NWO grant ODIN 016.VIDI.189.162, and the European Commission’s and University of Groningen’s CO-FUND Rosalind Franklin program.
Funding AgencyGrant Number
European Research Council (ERC)740120
Alexander von Humboldt FoundationUNSPECIFIED
European Research Council (ERC)717001
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)016.VIDI.189.162
University of GroningenUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20221206-898533400.1
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118252
Deposited By: Research Services Depository
Deposited On:06 Jan 2023 21:17
Last Modified:06 Jan 2023 21:17

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