Spectroscopic Monitoring of the Candidate Tidal Disruption Event in F01004–2237

We present results of spectroscopic monitoring observations of the ultraluminous infrared galaxy F01004−2237. This galaxy was observed to undergo changes in its optical spectrum, detected by comparing a spectrum from 2015 with one from 2000. These changes were coincident with photometric brightening...

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Bibliographic Details
Published in:The Astrophysical journal 2021-03, Vol.909 (2), p.159
Main Authors: Cannizzaro, Giacomo, Jonker, Peter G., Mata-Sánchez, D.
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astrophysics
Brightening
Deposition
Disruption
Emission lines
Emissions
Evolution
Galactic evolution
Galaxies
Infrared astronomy
Monitoring
Spectroscopy
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Summary:We present results of spectroscopic monitoring observations of the ultraluminous infrared galaxy F01004−2237. This galaxy was observed to undergo changes in its optical spectrum, detected by comparing a spectrum from 2015 with one from 2000. These changes were coincident with photometric brightening. The main changes detected in the optical spectrum are enhanced He ii λ 4686 emission and the appearance of He i λ 3898, λ 5876 emission lines. The favored interpretation of these changes was that of a tidal disruption event (TDE) happening in 2010. However, subsequent work suggested that these changes are caused by another hitherto unknown effect related to variations in the accretion rate in the active galactic nucleus (AGN). Our optical spectroscopic monitoring observations show that the evolution of the He lines is in line with the evolution seen in TDEs and opposite of what is observed from reverberation-mapping studies of AGNs, renewing the discussion of the interpretation of the flare as a TDE.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/abe049