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dc.contributor.authorSfaradi, I
dc.contributor.authorHoresh, A
dc.contributor.authorFender, R
dc.contributor.authorGreen, DA
dc.contributor.authorWilliams, DRA
dc.contributor.authorBright, J
dc.contributor.authorSchulze, S
dc.date.accessioned2022-05-31T23:30:51Z
dc.date.available2022-05-31T23:30:51Z
dc.date.issued2022
dc.identifier.issn0004-637X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/337652
dc.description.abstractWe report here radio follow-up observations of the optical Tidal Disruption Event (TDE) AT 2019azh. Previously reported X-ray observations of this TDE showed variability at early times and a dramatic increase in luminosity, by a factor of $\sim 10$, about 8 months after optical discovery. The X-ray emission is mainly dominated by intermediate hard--soft X-rays and is exceptionally soft around the X-ray peak, which is $L_X \sim 10^{43} \rm \, erg \, s^{-1}$. The high cadence $15.5$ GHz observations reported here show an early rise in radio emission followed by an approximately constant light curve, and a late-time flare. This flare starts roughly at the time of the observed X-ray peak luminosity and reaches its peak about $110$ days after the peak in the X-ray, and a year after optical discovery. The radio flare peaks at $\nu L_{\nu} \sim 10^{38} \rm \, erg \, s^{-1}$, a factor of two higher than the emission preceding the flare. In light of the late-time radio and X-ray flares, and the X-ray spectral evolution, we speculate a possible transition in the accretion state of this TDE, similar to the observed behavior in black hole X-ray binaries. We compare the radio properties of AT 2019azh to other known TDEs, and focus on the similarities to the late time radio flare of the TDE ASASSN-15oi.
dc.publisherAmerican Astronomical Society
dc.rightsPublisher's own licence
dc.titleA Late-time Radio Flare Following a Possible Transition in Accretion State in the Tidal Disruption Event AT 2019azh
dc.typeArticle
dc.publisher.departmentDepartment of Physics
dc.date.updated2022-05-31T12:18:27Z
prism.publicationNameAstrophysical Journal
dc.identifier.doi10.17863/CAM.85058
dcterms.dateAccepted2022-05-27
rioxxterms.versionofrecord10.3847/1538-4357/ac74bc
rioxxterms.versionAM
dc.contributor.orcidSfaradi, I [0000-0003-0466-3779]
dc.contributor.orcidHoresh, A [0000-0002-5936-1156]
dc.contributor.orcidGreen, DA [0000-0003-3189-9998]
dc.contributor.orcidWilliams, DRA [0000-0001-7361-0246]
dc.contributor.orcidBright, J [0000-0002-7735-5796]
dc.identifier.eissn1538-4357
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEuropean Research Council (307215)
cam.issuedOnline2022-07-13
cam.orpheus.successMon Nov 28 08:59:41 GMT 2022 - Embargo updated*
cam.orpheus.counter6
cam.depositDate2022-05-31
pubs.licence-identifierapollo-deposit-licence-2-1
pubs.licence-display-nameApollo Repository Deposit Licence Agreement
rioxxterms.freetoread.startdate2022-07-13


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