AT 2021hdr: A candidate tidal disruption of a gas cloud by a binary super massive black hole system

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dc.article.numberA84
dc.catalogadorpva
dc.contributor.authorHernández-García, L.
dc.contributor.authorMuñoz-Arancibia, A. M.
dc.contributor.authorLira, P.
dc.contributor.authorBruni, G.
dc.contributor.authorCuadra, J.
dc.contributor.authorArévalo, P.
dc.contributor.authorSánchez-Sáez, P.
dc.contributor.authorBernal, S.
dc.contributor.authorBauer, Franz Erik
dc.contributor.authorCatelan, Márcio
dc.contributor.authorPanessa, F.
dc.contributor.authorPávez-Herrera, M.
dc.contributor.authorRicci, C.
dc.contributor.authorReyes-Jainaga, I.
dc.contributor.authorAilawadhi, B.
dc.contributor.authorChavushyan, V.
dc.contributor.authorDastidar, R.
dc.contributor.authorDeconto-Machado, A.
dc.contributor.authorForster, F.
dc.contributor.authorGangopadhyay, A.
dc.contributor.authorGarcía-Pérez, A.
dc.contributor.authorMárquez, I.
dc.contributor.authorMasegosa, J.
dc.contributor.authorMisra, K.
dc.contributor.authorPatiño-Alvarez, V. M.
dc.contributor.authorPuig-Subira, M.
dc.contributor.authorRodi, J.
dc.contributor.authorSingh, M.
dc.date.accessioned2025-03-07T16:36:18Z
dc.date.available2025-03-07T16:36:18Z
dc.date.issued2024
dc.description.abstractWith a growing number of facilities able to monitor the entire sky and produce light curves with a cadence of days, in recent years there has been an increased rate of detection of sources whose variability deviates from standard behavior, revealing a variety of exotic nuclear transients. The aim of the present study is to disentangle the nature of the transient AT 2021hdr, whose optical light curve used to be consistent with a classic Seyfert 1 nucleus, which was also confirmed by its optical spectrum and high-energy properties. From late 2021, AT 2021hdr started to present sudden brightening episodes in the form of oscillating peaks in the Zwicky Transient Facility (ZTF) alert stream, and the same shape is observed in X-rays and UV from Swift data. The oscillations occur every ≈60-90 days with amplitudes of ≈0.2 mag in the g and r bands. Very Long Baseline Array (VLBA) observations show no radio emission at milliarcseconds scale. It is argued that these findings are inconsistent with a standard tidal disruption event (TDE), a binary supermassive black hole (BSMBH), or a changing-look active galactic nucleus (AGN); neither does this object resemble previous observed AGN flares, and disk or jet instabilities are an unlikely scenario. Here, we propose that the behavior of AT 2021hdr might be due to the tidal disruption of a gas cloud by a BSMBH. In this scenario, we estimate that the putative binary has a separation of ≈0.83 mpc and would merge in ≈7 × 104 years. This galaxy is located at 9 kpc from a companion galaxy, and in this work we report this merger for the first time. The oscillations are not related to the companion galaxy.
dc.description.funderNational Aeronautics and Space Administration
dc.description.funderAustralian Government
dc.description.funderEuropean Space Agency
dc.description.funderNOT
dc.description.funderEuropean Union's Horizon 2020 Programme
dc.description.funderUniversity of Copenhagen
dc.description.funderDPAC
dc.description.funderANID
dc.description.funderInstituto de Astrofisica de Andalucia
dc.description.funderUniversity of Arizona
dc.description.funderCSIRO
dc.description.funderBaja California, México
dc.description.funderGovernment of Western Australia
dc.description.funderGaia Data Processing and Analysis Consortium
dc.description.funderSierra San Pedro Mártir
dc.description.funderSevero Ochoa
dc.description.funderCONAHCYT
dc.description.funderFONDECYT
dc.description.funderScience and Industry Endowment Fund
dc.description.funderHeising-Simons Foundation
dc.fechaingreso.objetodigital2025-03-07
dc.format.extent16 páginas
dc.fuente.origenORCID
dc.identifier.doi10.1051/0004-6361/202451305
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.scopusidSCOPUS_ID:85211706459
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202451305
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/102442
dc.information.autorucInstituto de Astrofísica; Bauer, Franz Erik; 0000-0002-8686-8737; 1007961
dc.information.autorucInstituto de Astrofísica; Catelan, Márcio; 0000-0001-6003-8877; 1001556
dc.language.isoen
dc.nota.accesocontenido completo
dc.publisherEDP Sciences
dc.revistaAstronomy and Astrophysics
dc.rightsacceso abierto
dc.rights.licenseCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectGalaxies: active
dc.subjectGalaxies: individual: PBC J2123.9+3407
dc.subjectGalaxies: nuclei
dc.subjectGalaxies: Seyfert
dc.subject.ddc520
dc.subject.deweyAstronomíaes_ES
dc.subject.ods09 Industry, innovation and infrastructure
dc.subject.odspa09 Industria, innovación e infraestructura
dc.titleAT 2021hdr: A candidate tidal disruption of a gas cloud by a binary super massive black hole system
dc.typeartículo
dc.volumen692
sipa.codpersvinculados1007961
sipa.codpersvinculados1001556
sipa.trazabilidadSCOPUS;2024-12-22
sipa.trazabilidadORCID;2025-03-03
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