at constant temperature. At the same time, the blueshifts disappear from the spectrum and Bowen fluorescence lines (N III) become prominent, implying a source of far-UV photons, while the X-ray light curve peaks at $\approx10^{41}$. Thus accretion began promptly in this event, favouring accretion-powered over collision-powered outflow models. The size and mass of the outflow are consistent with the reprocessing layer needed to explain the large optical to X-ray ratio in this and other optical TDEs.'
author:
- |
    [M. Nicholl$^{1,2}$]{}[^1], [T. Wevers$^{3}$]{}, [S. R. Oates$^{1}$]{}, [K. D. Alexander$^{4}$[^2]]{}, [G. Leloudas$^{5}$]{}, [F. Onori$^{6}$]{}, , [S. Gomez$^{9}$]{}, [S. Campana$^{10}$]{}, [I. Arcavi$^{11,12}$]{}, [P. Charalampopoulos$^{5}$]{}, , [N. Ihanec$^{13}$]{}, [P. G. Jonker$^{14,15}$]{}, [A. Lawrence$^{2}$]{}, [I. Mandel$^{16,17,1}$]{}, , [J. Burke$^{18,19}$]{}, [D. Hiramatsu$^{18,19}$]{}, [D. A. Howell$^{18,19}$]{}, [C. Pellegrino$^{18,19}$]{}, , [J. P. Anderson$^{21}$]{}, [E. Berger$^{9}$]{}, [P. K. Blanchard$^{9}$]{}, [G. Cannizzaro$^{14,15}$]{} , [M. Dennefeld$^{22}$]{}, [L. Galbany$^{23}$]{}, [S. González-Gaitán$^{24}$]{}, [G. Hosseinzadeh$^{9}$]{}, , [I. Irani$^{26}$]{}, [P. Kuin$^{27}$]{}, [T. Muller-Bravo$^{28}$]{}, [J. Pineda$^{29}$]{}, [N. P. Ross$^{2}$]{}, , [B. Tucker$^{18}$]{}, [[Ł]{}. Wyrzykowski$^{13}$]{}, [D. R. Young$^{31}$]{}\
    Affiliations at end of paper
bibliography:
- 'refs.bib'
title: 'An outflow powers the optical rise of the nearby, fast-evolving tidal disruption event AT2019qiz'
---

\[firstpage\]

transients: tidal disruption events – galaxies: nuclei – black hole physics

Introduction {#sec:intro}
