Swift/UVOT discovery of Swift J221951-484240: a UV luminous ambiguous nuclear transient
| dc.contributor.author | Oates, S. R. | |
| dc.contributor.author | Kuin, N. P. M. | |
| dc.contributor.author | Nicholl, M. | |
| dc.contributor.author | Marshall, F. | |
| dc.contributor.author | Laha, Sibasish | |
| dc.contributor.author | Parsotan, Tyler | |
| dc.contributor.author | Klingler, N.J. | |
| dc.contributor.author | et al | |
| dc.date.accessioned | 2023-07-18T19:55:15Z | |
| dc.date.available | 2023-07-18T19:55:15Z | |
| dc.date.issued | 2023-07-03 | |
| dc.description | Authors: - E. Ridley, K. Boutsia, A. A. Breeveld, D. A. H. Buckley, S. B. Cenko, M. De Pasquale, P. G. Edwards, M. Gromadzki, R. Gupta, N. Morrell, M. Orio, S. B. Pandey, M. J. Page, K.L. Page, A. Rau, P. Schady, J. Stevens, P. J. Brown, P.A. Evans, C. Gronwall, J.A. Kennea, M. H. Siegel, A. Tohuvavohu, E. Ambrosi, S.D. Barthelmy, A.P. Beardmore, M.G. Bernardini, C. Bonnerot, S. Campana, R. Caputo, S. Ciroi, G. Cusumano, A. D'Ai, P. D'Avanzo, V. D'Elia, P. Giommi, D.H. Hartmann, H.A. Krimm, D. B. Malesani, A. Melandri, J. A. Nousek, P.T. O'Brien, J.P. Osborne, C. Pagani, D.M. Palmer, M. Perri, J. L. Racusin, T. Sakamoto, B. Sbarufatti, J. E. Schlieder, G. Tagliaferri, E. Troja, D. Xu | en_US |
| dc.description.abstract | We report the discovery of Swift J221951-484240 (hereafter: J221951), a luminous slow-evolving blue transient that was detected by the Neil Gehrels Swift Observatory Ultra-violet/Optical Telescope (Swift/UVOT) during the follow-up of Gravitational Wave alert S190930t, to which it is unrelated. Swift/UVOT photometry shows the UV spectral energy distribution of the transient to be well modelled by a slowly shrinking black body with an approximately constant temperature of T~2.5x10^4 K. At a redshift z=0.5205, J221951 had a peak absolute magnitude of M_u,AB = -23 mag, peak bolometric luminosity L_max=1.1x10^45 erg s^-1 and a total radiated energy of E>2.6x10^52 erg. The archival WISE IR photometry shows a slow rise prior to a peak near the discovery date. Spectroscopic UV observations display broad absorption lines in N V and O VI, pointing toward an outflow at coronal temperatures. The lack of emission in the higher H~Lyman lines, N I and other neutral lines is consistent with a viewing angle close to the plane of the accretion or debris disc. The origin of J221951 can not be determined with certainty but has properties consistent with a tidal disruption event and the turn-on of an active galactic nucleus. | en_US |
| dc.description.sponsorship | This research has made use of data obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC) and the Leicester Database and Archive Service (LEDAS), provided by NASA’s Goddard Space Flight Center and the School of Physics and Astronomy, University of Leicester, UK, respectively. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France (DOI : 10.26093/cds/vizier). The original description of the VizieR service was published in 2000, A&AS 143, 23. This research has made use of the NASA/IPAC Infrared Science Archive, which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology. This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile. Some of the observations reported in this paper were obtained with the Southern African Large Telescope (SALT). This research is based on observations made with the NASA/ESA Hubble Space Telescope obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5–26555. These observations are associated with program #16076. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO. We acknowledge the Gomeroi people as the traditional owners of the ATCA observatory site. This research uses services or data provided by the Astro Data Lab at NSF’s National OpticalInfrared Astronomy Research Laboratory. NOIRLab is operated by the Association of Universities for Research in Astronomy (AURA), Inc. under a cooperative agreement with the National Science Foundation. This publication uses the data from the AstroSat mission of the Indian Space Research Organisation (ISRO), archived at the Indian Space Science Data Centre (ISSDC). Part of the funding for GROND (both hardware as well as personnel) was generously granted from the Leibniz-Prize to Prof. G. Hasinger (DFG grant HA 1850/28-1). This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013). AAB, NPMK, MJP, KLP, PAE, APB and JPO acknowledge funding from the UK Space Agency. MDP acknowledges support for this work by the Scientific and Technological Research Council of Turkey (TUBITAK), Grant No: MFAG-119F073. RG ¨ and SBP acknowledge the financial support of ISRO under AstroSat archival Data utilization program (DS 2B-13013(2)/1/2021-Sec.2). RG and SBP are also thankful to the AstroSat UVIT team for helping with UVIT data analysis. EA, MGB, SC, GC, AD, PDA, AM and GT acknowledge funding from the Italian Space Agency, contract ASI/INAF n. I/004/11/4. This work is also partially supported by a grant from the Italian Ministry of Foreign Affairs and International Cooperation Nr. MAE0065741. PDA acknowledges support from PRIN-MIUR 2017 (grant 20179ZF5KS). DBM is supported by research grant 19054 from Villum Fonden. MN is supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 948381) and by a Fellowship from the Alan Turing Institute. MG is supported by the EU Horizon 2020 research and innovation programme under grant agreement No 101004719. ET acknowledges support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement 101002761). DBM is supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 725246). The Cosmic Dawn Center is supported by the Danish National Research Foundation. | en_US |
| dc.description.uri | https://arxiv.org/abs/2307.01044 | en_US |
| dc.format.extent | 37 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.genre | preprints | en_US |
| dc.identifier | doi:10.13016/m2govv-138z | |
| dc.identifier.uri | https://doi.org/10.48550/arXiv.2307.01044 | |
| dc.identifier.uri | http://hdl.handle.net/11603/28756 | |
| dc.language.iso | en_US | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | en_US |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.title | Swift/UVOT discovery of Swift J221951-484240: a UV luminous ambiguous nuclear transient | en_US |
| dc.type | Text | en_US |
| dcterms.creator | https://orcid.org/0000-0003-2714-0487 | en_US |
| dcterms.creator | https://orcid.org/0000-0002-4299-2517 | en_US |