2024MNRAS.530.1688O

Query : 2024MNRAS.530.1688O

2024MNRAS.530.1688O - Mon. Not. R. Astron. Soc., 530, 1688-1710 (2024/May-2)

Swift/UVOT discovery of Swift J221951-484240: a UV luminous ambiguous nuclear transient.

OATES S.R., KUIN N.P.M., NICHOLL M., MARSHALL F., RIDLEY E., BOUTSIA K., BREEVELD A.A., BUCKLEY D.A.H., CENKO S.B., DE PASQUALE M., EDWARDS P.G., GROMADZKI M., GUPTA R., LAHA S., MORRELL N., ORIO M., PANDEY S.B., PAGE M.J., PAGE K.L., PARSOTAN T., RAU A., SCHADY P., STEVENS J., BROWN P.J., EVANS P.A., GRONWALL C., KENNEA J.A., KLINGLER N.J., SIEGEL M.H., TOHUVAVOHU A., AMBROSI E., BARTHELMY S.D., BEARDMORE A.P., BERNARDINI M.G., BONNEROT C., CAMPANA S., CAPUTO R., CIROI S., CUSUMANO G., D'AI A., D'AVANZO P., D'ELIA V., GIOMMI P., HARTMANN D.H., KRIMM H.A., MALESANI D.B., MELANDRI A., NOUSEK J.A., O'BRIEN P.T., OSBORNE J.P., PAGANI C., PALMER D.M., PERRI M., RACUSIN J.L., SAKAMOTO T., SBARUFATTI B., SCHLIEDER J.E., TAGLIAFERRI G., TROJA E. and XU D.

Abstract (from CDS):

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 $L_{max}=1.1\times 10^{45}~{\rm erg\, s}^{-1}$ 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.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): black hole physics - gravitational waves - galaxies: nuclei - ultraviolet: general - transients: tidal disruption events

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Z 500-36 AG? 00 29 57.0542865144 +32 53 37.265932104           ~ 155 0
2 2MASS J01580475-0052221 Sy1 01 58 04.7506373016 -00 52 21.927742716   18.84 18.34     SNII 114 1
3 AT 2019qiz ev 04 46 37.880 -10 13 34.92           ~ 143 0
4 AT 2019ahk ev 07 00 11.410 -66 02 25.16           ~ 57 0
5 SDSS J075654.53+341543.6 G 07 56 54.5382395520 +34 15 43.641537336           ~ 96 0
6 PTF 15af SN* 08 48 28.13 +22 03 33.4           ~ 69 0
7 PS1-11af ev 09 57 26.815 +03 14 01.00           ~ 71 0
8 2MASS J10065085+0141342 G 10 06 50.8773292152 +01 41 34.006164648   18.082   17.032   SNII 127 0
9 2MASS J11084011+3405523 G 11 08 40.1149579272 +34 05 52.337925924           ~ 142 0
10 NGC 3690 IG 11 28 31.0 +58 33 41   13.19 12.86     ~ 1015 4
11 NAME Arp 299-B AT1 Rad 11 28 30.9875529 +58 33 40.783601           ~ 39 0
12 ZW VIII 211 rG 12 48 15.2253025968 +17 46 26.475426228   16.5       ~ 360 0
13 PSN K0905-001 SN? 14 57 03.10 +49 36 40.8           ~ 85 0
14 PS1-10jh ev 16 09 28.296 +53 40 23.52           ~ 153 0
15 2MASX J16105891-6055250 AG? 16 10 58.8863559654 -60 55 24.411688282           ~ 78 0
16 ASASSN -20hx SN? 17 03 36.541 +62 01 32.36           ~ 18 0
17 ASASSN -17jz SN* 17 19 55.850 +41 40 49.46           SNII 19 0
18 AT 2019cmw ev 18 48 39.472 +51 00 48.66           ~ 10 0
19 AT 2018zf SN* 19 27 19.485 +65 33 54.37           ~ 24 0
20 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2
21 ASASSN -15oi SN* 20 39 09.096 -30 45 20.71           ~ 184 0
22 PS1-1000789 SN* 20 42 44.7490 +15 30 32.240           SNIIn 39 0
23 AT 2021lwx ev 21 13 48.410 +27 25 50.38           ~ 16 0
24 ASASSN -15lh ev 22 02 15.4 -61 39 34           ~ 187 1
25 QSO B2204-54 Bla 22 07 43.73329058 -53 46 33.8199643   18.45 18.0 18.20   ~ 178 1
26 SWIFT J221951.8-484240 ev 22 19 51.800 -48 42 40.90           ~ 2 0
27 AT 2017eqx ev 22 26 48.370 +17 08 52.40           ~ 30 0
28 AT 2018bcb ev 22 43 42.90 -16 59 08.1           ~ 39 0
29 AT 2018fyk ev 22 50 16.10 -44 51 53.5           ~ 114 0
30 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 673 1

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