Knudsen, Kirsten K.Kirsten K.KnudsenWatson, DarachDarachWatsonFrayer, DavidDavidFrayerChristensen, LiseLiseChristensenGALLAZZI, Anna RitaAnna RitaGALLAZZIMichałowski, Michał J.Michał J.MichałowskiRichard, JohanJohanRichardZavala, JesúsJesúsZavala2020-09-012020-09-0120170035-8711http://hdl.handle.net/20.500.12386/27019The 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<SUP>★</SUP> 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<SUB>dust</SUB> ∼ 35-45 K for β = 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 II] 158.8 μm line at z_[C II] = 7.603. The stringent upper limits on the [C II] L<SUB>FIR</SUB> luminosity ratio suggest a [C II] deficit similar to several bright quasars and massive starbursts.STAMPAenArticle10.1093/mnras/stw30662-s2.0-85013208445000398112400010https://academic.oup.com/mnras/article/466/1/138/26087672017MNRAS.466..138KFIS/05 - ASTRONOMIA E ASTROFISICA