Extended Data Fig. 7: Spectral energy distribution of AT2022cmc at ≈ 15.6 days after discovery.
From: The Birth of a Relativistic Jet Following the Disruption of a Star by a Cosmological Black Hole
Data at radio (VLA), mm-band (GBT), UV/optical (Swift/UVOT, ZTF, PanSTARRS) and X-ray frequencies (NICER), demonstrate that the SED at this time cannot be explained as a single synchrotron spectrum. The SED at ≲ 25 GHz is optically thick (vFv ∝ v3), with a spectral break near ≈ 90 GHz. The spectral index from the GBT observation at ≈ 90 GHz to the NICER band is vFv ∝ v0.37, which (i) is substantially shallower than the observed NICER spectral index (vFv ∝ v0.57) and (ii) over-predicts the UV flux at this time. All the error bars represent 1σ uncertainties.
