SIMBAD references

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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