Fig. 1: Photometry and spectra of the quasar J0410−0139 at z = 7.0. | Nature Astronomy

Fig. 1: Photometry and spectra of the quasar J0410−0139 at z = 7.0.

From: A blazar in the epoch of reionization

Fig. 1

The greyscale postage stamps are optical and near-infrared images. The radio images use different colour maps (3 GHz in orange and 1.4 GHz in light blue). The 1995 NVSS 1.4 and the 2022 VLA 3 GHz images, taken in the most compact VLA configuration, have the lowest resolution. The 2021 VLA 1.4 GHz image, shown at the same size for comparison, confirms that there is a single radio source in the field with strong evidence of variability. The second-to-bottom panel compares spectra from VLT/FORS2, Keck/NIRES, Magellan/FIRE and LBT/LUCI, showing consistent rest-frame UV with no variability in the broad line region or accretion disk. The bottom panel shows the combined spectrum (and the 1σ error in green). Inset, A Gaussian fit to the Mg ii line, which was used to estimate the black hole properties (Table 3).

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