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A merger in the dus...
A merger in the dusty, z=7.5 galaxy A1689-zD1?
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- Knudsen, Kirsten Kraiberg, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Watson, D. (författare)
- Niels Bohr Institute
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Frayer, D. (författare)
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- Christensen, L. (författare)
- Niels Bohr Institute
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- Gallazzi, A. (författare)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Michalowski, M. J. (författare)
- University of Edinburgh
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- Richard, J. (författare)
- CRAL Le Centre de Recherche Astronomique de Lyon
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- Zavala, J. (författare)
- Niels Bohr Institute,Háskóli Íslands,University of Iceland
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(creator_code:org_t)
- 2016-11-29
- 2017
- Engelska.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 466:1, s. 138-146
- Relaterad länk:
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http://publications.... (primary) (free)
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http://arxiv.org/pdf...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The gravitationally lensed galaxy A1689-zD1 is one of the most distant spectroscopically confirmed sources (z = 7.5). It is the earliest known galaxy where the interstellar medium (ISM) has been detected; dust emission was detected with the Atacama Large Millimetre Array (ALMA). A1689-zD1 is also unusual among high-redshift dust emitters as it is a sub-L* galaxy and is therefore a good prospect for the detection of gaseous ISM in a more typical galaxy at this redshift. We observed A1689-zD1 with ALMA in bands 6 and 7 and with the Green Bank Telescope (GBT) in band Q. To study the structure of A1689-zD1, we map the mm-thermal dust emission and find two spatial components with sizes about 0.4 - 1.7 kpc (lensing-corrected). The rough spatial morphology is similar to what is observed in the near-infrared with HST and points to a perturbed dynamical state, perhaps indicative of a major merger or a disc in early formation. The ALMA photometry is used to constrain the far-infrared spectral energy distribution, yielding a dust temperature (T-dust similar to 35-45 K for beta = 1.5 - 2). We do not detect the CO(3-2) line in the GBT data with a 95 per cent upper limit of 0.3 mJy observed. We find a slight excess emission in ALMA band 6 at 220.9 GHz. If this excess is real, it is likely due to emission from the [C Pi] 158.8 mu m line at z([C II]) = 7.603. The stringent upper limits on the [C coproduct] L-FIR luminosity ratio suggest a [C coproduct] deficit similar to several bright quasars and massive starbursts.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies: high-redshift
- galaxies: ISM
- galaxies: evolution
- galaxies: formation
- submillimetre: galaxies
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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