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A merger in the dus...
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Knudsen, Kirsten Kraiberg,1976Chalmers tekniska högskola,Chalmers University of Technology
(författare)
A merger in the dusty, z=7.5 galaxy A1689-zD1?
- Artikel/kapitelEngelska2017
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2016-11-29
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Oxford University Press (OUP),2017
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:bad54e2f-8f24-446b-aa20-f1c6d004d073
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https://research.chalmers.se/publication/249164URI
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https://doi.org/10.1093/mnras/stw3066DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
Anmärkningar
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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 och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Watson, D.Niels Bohr Institute
(författare)
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Frayer, D.
(författare)
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Christensen, L.Niels Bohr Institute
(författare)
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Gallazzi, A.Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
(författare)
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Michalowski, M. J.University of Edinburgh
(författare)
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Richard, J.CRAL Le Centre de Recherche Astronomique de Lyon
(författare)
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Zavala, J.Niels Bohr Institute,Háskóli Íslands,University of Iceland
(författare)
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Chalmers tekniska högskolaNiels Bohr Institute
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)466:1, s. 138-1460035-87111365-2966
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