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We present IRAM/NOEMA and JVLA observations of the quasar J1342+0928 atz=7.54 and report detections of copious amounts of dust and [CII] emission inthe interstellar medium (ISM) of its host galaxy. At this redshift, the age ofthe universe is 690 Myr, about 10% younger than the redshift of the previousquasar record holder. Yet, the ISM of this new quasar host galaxy issignificantly enriched by metals, as evidenced by the detection of the [CII]158micron cooling line and the underlying far-infrared (FIR) dust continuumemission. To the first order, the FIR properties of this quasar host aresimilar to those found at a slightly lower redshift (z~6), making this sourceby far the FIR-brightest galaxy known at z>7.5. The [CII] emission is spatiallyunresolved, with an upper limit on the diameter of 7 kpc. Together with themeasured FWHM of the [CII] line, this yields a dynamical mass of the host of<1.5x10^11 M_sun. Using standard assumptions about the dust temperature andemissivity, the NOEMA measurements give a dust mass of (0.6-4.3)x10^8 M_sun.The brightness of the [CII] luminosity, together with the high dust mass, implyactive ongoing star formation in the quasar host. Using [CII]-SFR scalingrelations, we derive star formation rates of 85-545 M_sun/yr in the host,consistent with the values derived from the dust continuum. Indeed, an episodeof such past high star formation is needed to explain the presence of ~10^8M_sun of dust implied by the observations.

Copious Amounts of Dust and Gas in a z=7.5 Quasar Host Galaxy