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ALMA uncovers the [C II] emission and warm dust continuum in a z=8.31 Lyman break galaxy

Bakx, Tom J. L. C. (författare)
Nagoya Univ, Grad Sch Sci, Div Particle & Astrophys Sci, Nagoya, Aichi 4648602, Japan.;Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.
Tamura, Yoichi (författare)
Nagoya Univ, Grad Sch Sci, Div Particle & Astrophys Sci, Nagoya, Aichi 4648602, Japan.
Hashimoto, Takuya (författare)
Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.;Univ Tsukubu, Fac Pure & Appl Sci, Tomonaga Ctr Hist Universe TCHoU, Tsukuba, Ibaraki 3058571, Japan.;Osaka Sangyo Univ, Fac Design Technol, Dept Environm Sci & Technol, 3-1-1 Nakagaito, Daito, Osaka 5748530, Japan.
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Inoue, Akio K. (författare)
Waseda Univ, Fac Sci & Engn, Sch Adv Sci & Engn, Dept Phys,Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan.;Waseda Univ, Fac Sci & Engn, Waseda Res Inst Sci & Engn, Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan.
Lee, Minju M. (författare)
Max Planck Inst Extraterrestr Phys MPE, Giessenbachstr, D-85748 Garching, Germany.
Mawatari, Ken (författare)
Osaka Sangyo Univ, Fac Design Technol, Dept Environm Sci & Technol, 3-1-1 Nakagaito, Daito, Osaka 5748530, Japan.;Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan.
Ota, Kazuaki (författare)
Kyoto Univ, Res Adm Off, Sakyo Ku, Kyoto 6068501, Japan.
Umehata, Hideki (författare)
Open Univ Japan, 2-11 Wakaba, Chiba 2618586, Japan.;RIKEN, Cluster Pioneering Res, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Univ Tokyo, Grad Sch Sci, Inst Astron, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan.
Zackrisson, Erik (författare)
Uppsala universitet,Observationell astrofysik
Hatsukade, Bunyo (författare)
Univ Tokyo, Grad Sch Sci, Inst Astron, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan.
Kohno, Kotaro (författare)
Univ Tokyo, Grad Sch Sci, Inst Astron, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan.;Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe, Tokyo 1130033, Japan.
Matsuda, Yuichi (författare)
Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.;Grad Univ Adv Studies SOKENDAI, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.
Matsuo, Hiroshi (författare)
Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.;Grad Univ Adv Studies SOKENDAI, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.
Okamoto, Takashi (författare)
Hokkaido Univ, Fac Sci, Kita Ku, N10 W8, Sapporo, Hokkaido 0600810, Japan.
Shibuya, Takatoshi (författare)
Kitami Inst Technol, 165 Koen Cho, Kitami, Hokkaido 0908507, Japan.
Shimizu, Ikkoh (författare)
Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan.
Taniguchi, Yoshiaki (författare)
Kyoto Univ, Res Adm Off, Sakyo Ku, Kyoto 6068501, Japan.
Yoshida, Naoki (författare)
Univ Tokyo, Grad Sch Sci, Dept Phys, Tokyo 1130033, Japan.;Univ Tokyo, Todai Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan.
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Nagoya Univ, Grad Sch Sci, Div Particle & Astrophys Sci, Nagoya, Aichi 4648602, Japan;Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan. Nagoya Univ, Grad Sch Sci, Div Particle & Astrophys Sci, Nagoya, Aichi 4648602, Japan. (creator_code:org_t)
2020-03-05
2020
Engelska.
Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 493:3, s. 4294-4307
Relaterad länk:
https://academic.oup...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • We report on the detection of the [C II] 157.7 mu m emission from the Lyman break galaxy (LBG) MACS0416_Y1 at z = 8.3113, by using the Atacama Large Millimeter/submillimeter Array (ALMA). The luminosity ratio of [O III] 88 mu m (from previous campaigns) to [CII] is 9.3 +/- 2.6, indicative of hard interstellar radiation fields and/or a low covering fraction of photodissociation regions. The emission of [C II] is cospatial to the 850 mu m dust emission (90 mu m rest frame, from previous campaigns), however the peak [C II] emission does not agree with the peak [O III] emission, suggesting that the lines originate from different conditions in the interstellar medium. We fail to detect continuum emission at 1.5 mm (160 mu m rest frame) down to 18 mu Jy (3 sigma). This non-detection places a strong limits on the dust spectrum, considering the 137 +/- 26 mu Jy continuum emission at 850 mu m. This suggests an unusually warm dust component (T > 80 K, 90 per cent confidence limit), and/or a steep dust-emissivity index (beta(dust) > 2), compared to galaxy-wide dust emission found at lower redshifts (typically T similar to 30-50 K, beta(dust) similar to 1-2). If such temperatures are common, thiswould reduce the required dust mass and relax the dust production problem at the highest redshifts. We therefore warn against the use of only single-wavelength information to derive physical properties, recommend a more thorough examination of dust temperatures in the early Universe, and stress the need for instrumentation that probes the peak of warm dust in the Epoch of Reionization.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

galaxies: formation
galaxies: high-redshift
galaxies: ISM

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