eprintid: 10192060
rev_number: 6
eprint_status: archive
userid: 699
dir: disk0/10/19/20/60
datestamp: 2024-05-14 13:40:06
lastmod: 2024-05-14 13:40:06
status_changed: 2024-05-14 13:40:06
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Oates, SR
creators_name: Kuin, NPM
creators_name: Nicholl, M
creators_name: Marshall, F
creators_name: Ridley, E
creators_name: Boutsia, K
creators_name: Breeveld, AA
creators_name: Buckley, DAH
creators_name: Cenko, SB
creators_name: De Pasquale, M
creators_name: Edwards, PG
creators_name: Gromadzki, M
creators_name: Gupta, R
creators_name: Laha, S
creators_name: Morrell, N
creators_name: Orio, M
creators_name: Pandey, SB
creators_name: Page, MJ
creators_name: Page, KL
creators_name: Parsotan, T
creators_name: Rau, A
creators_name: Schady, P
creators_name: Stevens, J
creators_name: Brown, PJ
creators_name: Evans, PA
creators_name: Gronwall, C
creators_name: Kennea, JA
creators_name: Klingler, NJ
creators_name: Siegel, MH
creators_name: Tohuvavohu, A
creators_name: Ambrosi, E
creators_name: Barthelmy, SD
creators_name: Beardmore, AP
creators_name: Bernardini, MG
creators_name: Bonnerot, C
creators_name: Campana, S
creators_name: Caputo, R
creators_name: Ciroi, S
creators_name: Cusumano, G
creators_name: Aì, AD
creators_name: Avanzo, PD
creators_name: Elia, VD
creators_name: Giommi, P
creators_name: Hartmann, DH
creators_name: Krimm, HA
creators_name: Malesani, DB
creators_name: Melandri, A
creators_name: Nousek, JA
creators_name: Brien, PTO
creators_name: Osborne, JP
creators_name: Pagani, C
creators_name: Palmer, DM
creators_name: Perri, M
creators_name: Racusin, JL
creators_name: Sakamoto, T
creators_name: Sbarufatti, B
creators_name: Schlieder, JE
creators_name: Tagliaferri, G
creators_name: Troja, E
creators_name: Xu, D
title: Swift/UVOT discovery of Swift J221951−484240: a UV luminous ambiguous nuclear transient
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F63
keywords: Black hole physics, gravitational waves, galaxies: nuclei, ultraviolet: general, transients: tidal disruption events
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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 Ultraviolet/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 blackbody with an approximately constant temperature of T ∼ 2.5 × 104 K. At a redshift z = 0.5205, J221951 had a peak absolute magnitude of Mu,AB = −23 mag, peak bolometric luminosity Lmax = 1.1 × 1045 erg s−1 and a total radiated energy of E > 2.6 × 1052 erg. The archival Wide-field Infrared Survey Explorer 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 towards an outflow at coronal temperatures. The lack of emission in the higher H α 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 cannot be determined with certainty but has properties consistent with a tidal disruption event and the turn-on of an active galactic nucleus.
date: 2024-05-01
date_type: published
publisher: Oxford University Press (OUP)
official_url: http://dx.doi.org/10.1093/mnras/stae795
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2273655
doi: 10.1093/mnras/stae795
lyricists_name: Breeveld, Alice
lyricists_name: Kuin, Nicolaas
lyricists_id: AABRE89
lyricists_id: NPMKU93
actors_name: Flynn, Bernadette
actors_id: BFFLY94
actors_role: owner
full_text_status: public
publication: Monthly Notices of the Royal Astronomical Society
volume: 530
number: 2
pagerange: 1688-1710
citation:        Oates, SR;    Kuin, NPM;    Nicholl, M;    Marshall, F;    Ridley, E;    Boutsia, K;    Breeveld, AA;                                                                                                                                                                                                                     ... Xu, D; + view all <#>        Oates, SR;  Kuin, NPM;  Nicholl, M;  Marshall, F;  Ridley, E;  Boutsia, K;  Breeveld, AA;  Buckley, DAH;  Cenko, SB;  De Pasquale, M;  Edwards, PG;  Gromadzki, M;  Gupta, R;  Laha, S;  Morrell, N;  Orio, M;  Pandey, SB;  Page, MJ;  Page, KL;  Parsotan, T;  Rau, A;  Schady, P;  Stevens, J;  Brown, PJ;  Evans, PA;  Gronwall, C;  Kennea, JA;  Klingler, NJ;  Siegel, MH;  Tohuvavohu, A;  Ambrosi, E;  Barthelmy, SD;  Beardmore, AP;  Bernardini, MG;  Bonnerot, C;  Campana, S;  Caputo, R;  Ciroi, S;  Cusumano, G;  Aì, AD;  Avanzo, PD;  Elia, VD;  Giommi, P;  Hartmann, DH;  Krimm, HA;  Malesani, DB;  Melandri, A;  Nousek, JA;  Brien, PTO;  Osborne, JP;  Pagani, C;  Palmer, DM;  Perri, M;  Racusin, JL;  Sakamoto, T;  Sbarufatti, B;  Schlieder, JE;  Tagliaferri, G;  Troja, E;  Xu, D;   - view fewer <#>    (2024)    Swift/UVOT discovery of Swift J221951−484240: a UV luminous ambiguous nuclear transient.                   Monthly Notices of the Royal Astronomical Society , 530  (2)   pp. 1688-1710.    10.1093/mnras/stae795 <https://doi.org/10.1093/mnras%2Fstae795>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10192060/1/stae795.pdf