التفاصيل البيبلوغرافية
| العنوان: |
Swift/UVOT discovery of Swift J221951−484240: a UV luminous ambiguous nuclear transient. |
| المؤلفون: |
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 |
| المصدر: |
Monthly Notices of the Royal Astronomical Society; May2024, Vol. 530 Issue 2, p1688-1710, 23p |
| مصطلحات موضوعية: |
SPECTRAL energy distribution, ACTIVE galactic nuclei, OPTICAL telescopes, ACCRETION disks, GRAVITATIONAL waves, ELECTRON field emission, OBSERVATORIES |
| مستخلص: |
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 FROM AUTHOR] |
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