The ambiguous AT2022rze: changing-look AGN mimicking a supernova in a merging galaxy system

Pessi, Priscila; Lunnan, R.; Sollerman, Jesper; Yan, L.; Le Reste, A.; Yao, Y.; Nordblom, S.; Sharma, Y.; Gilfanov, M.; Sunyaev, R.; Schulze, S.; Johansson, J.; Gangopadhyay, A.; Fremling, C.; Tristram, K.; Hayes, Matthew; Fransson, C.; Hu, Yan; Brennan, S. J.; Rose, S.; De, K.; Hinds, K-Ryan; Liu, Chang; Miller, Adam; Qin, Yu-Jing; Charalampopoulos, P.; Gkini, A.; Graham, Matthew; Gutiérrez, Claudia; Mattila, Seppo; Nagao, Takashi; Perez-Fournon, I; Poidevin, F.; Bloom, J. S.; Brugger, J.; Chen, T. X.; Kasliwal, Mansi; Masci, F. J.; Purdum, J. N.
The ambiguous AT2022rze: changing-look AGN mimicking a supernova in a merging galaxy system

Pessi, Priscila
Lunnan, R.
Sollerman, Jesper
Yan, L.
Le Reste, A.
Yao, Y.
Nordblom, S.
Sharma, Y.
Gilfanov, M.
Sunyaev, R.
Schulze, S.
Johansson, J.
Gangopadhyay, A.
Fremling, C.
Tristram, K.
Hayes, Matthew
Fransson, C.
Hu, Yan
Brennan, S. J.
Rose, S.
De, K.
Hinds, K-Ryan
Liu, Chang
Miller, Adam
Qin, Yu-Jing
Charalampopoulos, P.
Gkini, A.
Graham, Matthew
Gutiérrez, Claudia
Mattila, Seppo
Nagao, Takashi
Perez-Fournon, I
Poidevin, F.
Bloom, J. S.
Brugger, J.
Chen, T. X.
Kasliwal, Mansi
Masci, F. J.
Purdum, J. N.
Katso/Avaa
Lataukset: 

Oxford University Press
doi:10.1093/mnras/staf1433
URI
https://doi.org/10.1093/mnras/staf1433
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe202601216684
Tiivistelmä

AT2022rze is a luminous, ambiguous transient located south-east of the geometric centre of its host galaxy at redshift z = 0 . 08. The host appears to be formed by a merging galaxy system. The observed characteristics of AT2022rze are reminiscent of active galactic nuclei (AGNs), tidal disruption events, and superluminous supernovae. The transient reached a peak absolute magnitude of −20.2 ±0.2 mag, showing a sharp rise ( trise , 1 / e = 27 . 5 ±0 . 6 d) followed by a slow decline ( tdec , 1 / e = 382 . 9 ±0 . 6). Its bumpy light curve and narrow Balmer lines indicate the presence of gas (and dust). Its light curve shows rather red colours, indicating that the transient could be affected by significant host extinction. The spectra reveal coronal lines, indicative of high-energy (X-ray/UV) emission. Archival data reveal no prior activity at this location, disfavouring a steady-state AGN, although an optical spectrum obtained prior to the transient is consistent with an AGN classification of the host. Based on this, we conclude that the transient most likely represents a changing-look AGN at the centre of the smallest component of the merging system.

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