Evidence for rapid disc formation and reprocessing in the X-ray bright tidal disruption event candidate AT 2018fyk

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorWevers, T.en_US
dc.contributor.authorPasham, D. R.en_US
dc.contributor.authorvan Velzen, S.en_US
dc.contributor.authorLeloudas, G.en_US
dc.contributor.authorSchulze, Steveen_US
dc.contributor.authorMiller-Jones, J. C. A.en_US
dc.contributor.authorJonker, P. G.en_US
dc.contributor.authorGromadzki, M.en_US
dc.contributor.authorKankare, E.en_US
dc.contributor.authorHodgkin, S. T.en_US
dc.contributor.authorWyrzykowski, L.en_US
dc.contributor.authorKostrzewa-Rutkowska, Z.en_US
dc.contributor.authorMoran, S.en_US
dc.contributor.authorBerton, Marcoen_US
dc.contributor.authorMaguire, K.en_US
dc.contributor.authorOnori, F.en_US
dc.contributor.authorMattila, S.en_US
dc.contributor.authorNicholl, M.en_US
dc.contributor.departmentMetsähovi Radio Observatoryen
dc.contributor.organizationUniversity of Cambridgeen_US
dc.contributor.organizationMassachusetts Institute of Technology MITen_US
dc.contributor.organizationUniversity of Maryland, Baltimoreen_US
dc.contributor.organizationTechnical University of Denmarken_US
dc.contributor.organizationWeizmann Institute of Scienceen_US
dc.contributor.organizationCurtin Universityen_US
dc.contributor.organizationSRON Netherlands Institute for Space Researchen_US
dc.contributor.organizationUniversity of Warsawen_US
dc.contributor.organizationUniversity of Turkuen_US
dc.contributor.organizationTrinity College Dublinen_US
dc.contributor.organizationIstituto di Astrofisica e Planetologia Spazialien_US
dc.contributor.organizationUniversity of Edinburghen_US
dc.date.accessioned2020-03-13T15:26:24Z
dc.date.available2020-03-13T15:26:24Z
dc.date.issued2019-10en_US
dc.description.abstractWe present optical spectroscopic and Swift UVOT/XRT observations of the X-ray and UV/optical bright tidal disruption event (TDE) candidate AT 2018fyk/ASASSN-18ul discovered by ASAS-SN. The Swift light curve is atypical for a TDE, entering a plateau after similar to 40d of decline from peak. After 80d the UV/optical light curve breaks again to decline further, while the X-ray emission becomes brighter and harder. In addition to broad H, He, and potentially O/Fe lines, narrow emission lines emerge in the optical spectra during the plateau phase. We identify both high-ionization (Oiii) and low-ionization (Feii) lines, which are visible for similar to 45d. We similarly identify Feii lines in optical spectra of ASASSN-15oi 330 d after discovery, indicating that a class of Fe-rich TDEs exists. The spectral similarity between AT 2018fyk, narrow-line Seyfert 1 galaxies, and some extreme coronal line emitters suggests that TDEs are capable of creating similar physical conditions in the nuclei of galaxies. The Feii lines can be associated with the formation of a compact accretion disc, as the emergence of low-ionization emission lines requires optically thick, high-density gas. Taken together with the plateau in X-ray and UV/optical luminosity this indicates that emission from the central source is efficiently reprocessed into UV/optical wavelengths. Such a two-component light curve is very similar to that seen in the TDE candidate ASASSN-15lh, and is a natural consequence of a relativistic orbital pericentre.en
dc.description.versionPeer revieweden
dc.format.extent15
dc.format.extent4816-4830
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationWevers, T, Pasham, D R, van Velzen, S, Leloudas, G, Schulze, S, Miller-Jones, J C A, Jonker, P G, Gromadzki, M, Kankare, E, Hodgkin, S T, Wyrzykowski, L, Kostrzewa-Rutkowska, Z, Moran, S, Berton, M, Maguire, K, Onori, F, Mattila, S & Nicholl, M 2019, ' Evidence for rapid disc formation and reprocessing in the X-ray bright tidal disruption event candidate AT 2018fyk ', Monthly Notices of the Royal Astronomical Society, vol. 488, no. 4, pp. 4816-4830 . https://doi.org/10.1093/mnras/stz1976en
dc.identifier.doi10.1093/mnras/stz1976en_US
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.otherPURE UUID: fdffe713-5891-4171-9f71-a18d37e5a9b5en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/fdffe713-5891-4171-9f71-a18d37e5a9b5en_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/41462661/ELEC_Berton_Evidence_for_rapid.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/43475
dc.identifier.urnURN:NBN:fi:aalto-202003132516
dc.language.isoenen
dc.publisherOXFORD UNIV PRESS INC
dc.relation.ispartofseriesMonthly Notices of the Royal Astronomical Societyen
dc.relation.ispartofseriesVolume 488, issue 4en
dc.rightsopenAccessen
dc.subject.keywordaccretionen_US
dc.subject.keywordaccretion discsen_US
dc.subject.keywordblack hole physicsen_US
dc.subject.keywordgalaxies: nucleien_US
dc.subject.keywordultraviolet: galaxiesen_US
dc.subject.keywordX-rays: galaxiesen_US
dc.subject.keywordFE-II EMISSIONen_US
dc.subject.keywordBLACK-HOLE MASSESen_US
dc.subject.keywordACCRETION DISCen_US
dc.subject.keywordFOLLOW-UPen_US
dc.subject.keywordGALAXIESen_US
dc.subject.keywordSTELLARen_US
dc.subject.keywordPOPULATIONen_US
dc.subject.keywordSTARSen_US
dc.subject.keywordLINESen_US
dc.subject.keywordSPECTROSCOPYen_US
dc.titleEvidence for rapid disc formation and reprocessing in the X-ray bright tidal disruption event candidate AT 2018fyken
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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