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AT2023fhn (the Finch): a Luminous Fast Blue Optical Transient at a large offset from its host galaxy

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arxiv 2307.01771 v2 pith:5EOT5U2B submitted 2023-07-04 astro-ph.HE astro-ph.GA

AT2023fhn (the Finch): a Luminous Fast Blue Optical Transient at a large offset from its host galaxy

A. A. Chrimes , P. G. Jonker , A. J. Levan , D. L. Coppejans , N. Gaspari , B. P. Gompertz , P. J. Groot , D. B. Malesani
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A. Mummery E. R. Stanway K. Wiersema
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keywords at2023fhnbluelargelfbotsluminouseventsfastgalaxies
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Luminous Fast Blue Optical Transients (LFBOTs) - the prototypical example being AT2018cow - are a rare class of events whose origins are poorly understood. They are characterised by rapid evolution, featureless blue spectra at early times, and luminous X-ray and radio emission. LFBOTs thus far have been found exclusively at small projected offsets from star-forming host galaxies. We present Hubble Space Telescope, Gemini, Chandra and Very Large Array observations of a new LFBOT, AT2023fhn. The Hubble Space Telescope data reveal a large offset (greater than 3.5 half-light radii) from the two closest galaxies, both at a redshift of 0.24. The location of AT2023fhn is in stark contrast with previous events, and demonstrates that LFBOTs can occur in a range of galactic environments.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. AT2019ijn: a fast-rising, slow-decaying blue optical transient with exceptionally bright radio emission

    astro-ph.HE 2026-07 conditional novelty 7.0

    AT2019ijn combines LFBOT-like fast optical rise and blue color with slow decay and radio luminosity peaking late at 2e31 erg/s/Hz, best fit as an off-axis jetted IMBH TDE.