Accurate dust temperature determination in a z=7.13 galaxy
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Accurate dust temperature determination in a z=7.13 galaxy. / Bakx, Tom J. L. C.; Sommovigo, Laura; Carniani, Stefano; Ferrara, Andrea; Akins, Hollis B.; Fujimoto, Seiji; Hagimoto, Masato; Knudsen, Kirsten K.; Pallottini, Andrea; Tamura, Yoichi; Watson, Darach.
In: Monthly Notices of the Royal Astronomical Society, Vol. 508, No. 1, 09.11.2021, p. L58-L63.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Accurate dust temperature determination in a z=7.13 galaxy
AU - Bakx, Tom J. L. C.
AU - Sommovigo, Laura
AU - Carniani, Stefano
AU - Ferrara, Andrea
AU - Akins, Hollis B.
AU - Fujimoto, Seiji
AU - Hagimoto, Masato
AU - Knudsen, Kirsten K.
AU - Pallottini, Andrea
AU - Tamura, Yoichi
AU - Watson, Darach
PY - 2021/11/9
Y1 - 2021/11/9
N2 - We report ALMA Band 9 continuum observations of the normal, dusty star-forming galaxy A1689-zD1 at z = 7.13, resulting in a similar to 4.6 sigma detection at 702GHz. For the first time, these observations probe the far-infrared spectrum shortward of the emission peak of a galaxy in the Epoch of Reionization (EoR). Together with ancillary data from earlier works, we derive the dust temperature, T-d, and mass, M-d, of A1689-zD1 using both traditional modified blackbody spectral energy density fitting, and a new method that relies only on the [CII] 158 mu m line and underlying continuum data. The two methods give T-d = (42(-7)(+13), 40(-7)(+13))K, and M-d = (1.7(-7)(+13), 2.0(-7)(+13)). Band 9 observations improve the accuracy of the dust temperature (mass) estimate by similar to 50 per cent (6 times). The derived temperatures confirm the reported increasing T-d-redshift trend between z = 0 and 8; the dust mass is consistent with a supernova origin. Although A1689-zD1 is a normal UV-selected galaxy, our results, implying that similar to 85 per cent of its star-formation rate is obscured, underline the non-negligible effects of dust in EoR galaxies.
AB - We report ALMA Band 9 continuum observations of the normal, dusty star-forming galaxy A1689-zD1 at z = 7.13, resulting in a similar to 4.6 sigma detection at 702GHz. For the first time, these observations probe the far-infrared spectrum shortward of the emission peak of a galaxy in the Epoch of Reionization (EoR). Together with ancillary data from earlier works, we derive the dust temperature, T-d, and mass, M-d, of A1689-zD1 using both traditional modified blackbody spectral energy density fitting, and a new method that relies only on the [CII] 158 mu m line and underlying continuum data. The two methods give T-d = (42(-7)(+13), 40(-7)(+13))K, and M-d = (1.7(-7)(+13), 2.0(-7)(+13)). Band 9 observations improve the accuracy of the dust temperature (mass) estimate by similar to 50 per cent (6 times). The derived temperatures confirm the reported increasing T-d-redshift trend between z = 0 and 8; the dust mass is consistent with a supernova origin. Although A1689-zD1 is a normal UV-selected galaxy, our results, implying that similar to 85 per cent of its star-formation rate is obscured, underline the non-negligible effects of dust in EoR galaxies.
KW - dust, extinction
KW - galaxies: evolution
KW - galaxies: formation
KW - galaxies: high-redshift
KW - galaxies: individual: (A1689-zD1)
KW - submillimetre: galaxies
KW - 158 MU-M
KW - ALMA SPECTROSCOPIC SURVEY
KW - DEEP FIELD
KW - CONTINUUM EMISSION
KW - INFRARED-EMISSION
KW - INTERSTELLAR DUST
KW - DARK
KW - UV
KW - LUMINOSITY
KW - EPOCH
U2 - 10.1093/mnrasl/slab104
DO - 10.1093/mnrasl/slab104
M3 - Journal article
VL - 508
SP - L58-L63
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 285310883