Recent ALMA 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 (Td) in the SED fitting procedure. This introduces uncertainties in the inferred dust masses (Md), infrared luminosities (LIR), and obscured Star Formation Rate (SFR) fraction at z > 4. In this work we use a method that allows us to constrain Td with a single band measurement by combining the 158 μm continuum information with the overlying [C II] emission line. We analyse the 21 [C II] and FIR continuum detected z ∼ 5 galaxies in ALPINE, finding a range of Td = 25 − 60 K and Md = 0.6 − 25.1 × 107 M⊙. Given the measured stellar masses of ALPINE galaxies, the inferred dust yields are around Md/M⋆ = (0.2 − 8) × 10−3, consistent with theoretical dust-production constraints. We find that 8 out of 21 ALPINE galaxies have LIR ≥ 1012 L⊙, comparable to UltraLuminous IR Galaxies (ULIRGs). Relying on ultraviolet-to-optical SED fitting, the SFR was underestimated by up to 2 orders of magnitude in 4 of these 8 ULIRGs-like galaxies. We conclude that these 4 peculiar sources should be characterised by a two-phase interstellar medium structure with “spatially-segregated” FIR and ultraviolet emitting regions.

A new look at the infrared properties of z ∼ 5 galaxies / L Sommovigo; A Ferrara; S Carniani; A Pallottini; P Dayal; E Pizzati; M Ginolfi; V Markov; A Faisst. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - ELETTRONICO. - (2022), pp. 0-0. [10.1093/mnras/stac2997]

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

M Ginolfi;
2022

Abstract

Recent ALMA 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 (Td) in the SED fitting procedure. This introduces uncertainties in the inferred dust masses (Md), infrared luminosities (LIR), and obscured Star Formation Rate (SFR) fraction at z > 4. In this work we use a method that allows us to constrain Td with a single band measurement by combining the 158 μm continuum information with the overlying [C II] emission line. We analyse the 21 [C II] and FIR continuum detected z ∼ 5 galaxies in ALPINE, finding a range of Td = 25 − 60 K and Md = 0.6 − 25.1 × 107 M⊙. Given the measured stellar masses of ALPINE galaxies, the inferred dust yields are around Md/M⋆ = (0.2 − 8) × 10−3, consistent with theoretical dust-production constraints. We find that 8 out of 21 ALPINE galaxies have LIR ≥ 1012 L⊙, comparable to UltraLuminous IR Galaxies (ULIRGs). Relying on ultraviolet-to-optical SED fitting, the SFR was underestimated by up to 2 orders of magnitude in 4 of these 8 ULIRGs-like galaxies. We conclude that these 4 peculiar sources should be characterised by a two-phase interstellar medium structure with “spatially-segregated” FIR and ultraviolet emitting regions.
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L Sommovigo; A Ferrara; S Carniani; A Pallottini; P Dayal; E Pizzati; M Ginolfi; V Markov; A Faisst
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/1289308
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