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16498

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DataCite Commons2023-04-21 更新2025-04-15 收录
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http://esdcdoi.esac.esa.int/doi/html/data/astronomy/hst/16498.html
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ASASSN-14ko is a recently discovered comma periodically flaring comma nuclear transient within known AGN ESO 253-G003. The flares have a mean period of virgul114 days and a nonzero comma negative period derivative. The exact origin of these UV-optical flares is currently V1.0. STIS UV observations of the rise comma peak comma and decline in the UV revealed rapid and dramatic evolution in Dec 2020 showing strong P Cygni profiles in the FUV for C IV and N V that rapidly changed. The UV spectra during all of the epochs substantially differ from any tidal disruption event (TDE) with UV spectroscopic observations and also differ from any AGN-quasar spectrum the proposers are familiar with. The rapid evolution itself is also unprecedented for TDEs which thus far have exhibited static or slowly evolving UV spectra. Most intriguing is that the appearance of the P Cygni profiles appears to correlate with X-ray diminings which are consistent with being due to obscuration. Combining the X-ray and STIS observations for the Dec flare a consistent picture of a rapid outflow comma possibly a tidal stream comma is emerging. Here we propose for 2 additional early-time STIS spectra covering the earliest phases of ASASSN-14ko.s April 2021 outburst. These observations will bring into focus these dramatic spectroscopic and X-rays changes.
提供机构:
European Space Agency
创建时间:
2023-04-21
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