The First Tidal Disruption Flare in ZTF: From Photometric Selection to Multi-wavelength Characterization
The First Tidal Disruption Flare in ZTF: From Photometric Selection to Multi-wavelength Characterization
复制标题
DOI：
10.3847/1538-4357/aafe0c
复制
发表时间：
2018-09
期刊：
影响因子：
--
通讯作者：
S. van Velzen;S. Gezari;S. Cenko;E. Kara;J. Miller-Jones;T. Hung;J. Bright;Nathaniel Roth;N. Blagorodnova;D. Huppenkothen;Lin Yan;E. Ofek;J. Sollerman;S. Frederick;C. Ward;Matthew J. Graham;R. Fender;M. Kasliwal;Chris Canella;R. Stein;M. Giomi;V. Brinnel;J. Santen;J. Nordin;E. Bellm;R. Dekany;C. Fremling;V. Golkhou;T. Kupfer;S. Kulkarni;R. Laher;A. Mahabal;F. Masci;Adam A. Miller;James D. Neill;R. Riddle;M. Rigault;B. Rusholme;M. Soumagnac;Yutaro 朗橘 Tachibana 優太
中科院分区：
文献类型：
--
作者：
S. van Velzen;S. Gezari;S. Cenko;E. Kara;J. Miller-Jones;T. Hung;J. Bright;Nathaniel Roth;N. Blagorodnova;D. Huppenkothen;Lin Yan;E. Ofek;J. Sollerman;S. Frederick;C. Ward;Matthew J. Graham;R. Fender;M. Kasliwal;Chris Canella;R. Stein;M. Giomi;V. Brinnel;J. Santen;J. Nordin;E. Bellm;R. Dekany;C. Fremling;V. Golkhou;T. Kupfer;S. Kulkarni;R. Laher;A. Mahabal;F. Masci;Adam A. Miller;James D. Neill;R. Riddle;M. Rigault;B. Rusholme;M. Soumagnac;Yutaro 朗橘 Tachibana 優太
我们介绍了Zwicky瞬态设施（ZTF）对Holoien等人报告的潮汐中断耀斑AT 2018 zr/PS18 kh的观测，并在ZTF调试期间检测到。潮汐扰动事件（TDE）的ZTF光变曲线对上升到峰值的采样非常好，在最大光照时间之前有50天的g-和r-波段检测。我们还提出了我们的多波长的后续观测，包括检测热（kT <$100 eV）的X射线源，这是两个数量级比同期的光学/紫外黑体光度，和严格的上限的无线电发射。我们使用128个已知活动星系核（AGN）的观测结果来评估ZTF天体测量的质量，发现真正的核耀斑的主耀斑距离中值为0.″2。使用ZTF观测已知活动星系核和超新星的变化，我们展示了如何将这些来源与TDE分开。结合光变曲线的形状、颜色和在宿主星系中的位置，可以从多波段光学巡天（如ZTF或大型综合巡天望远镜）中选择干净的TDE样本。
We present Zwicky Transient Facility (ZTF) observations of the tidal disruption flare AT2018zr/PS18kh reported by Holoien et al. and detected during ZTF commissioning. The ZTF light curve of the tidal disruption event (TDE) samples the rise-to-peak exceptionally well, with 50 days of g- and r-band detections before the time of maximum light. We also present our multi-wavelength follow-up observations, including the detection of a thermal (kT ≈ 100 eV) X-ray source that is two orders of magnitude fainter than the contemporaneous optical/UV blackbody luminosity, and a stringent upper limit to the radio emission. We use observations of 128 known active galactic nuclei (AGNs) to assess the quality of the ZTF astrometry, finding a median host-flare distance of 0.″2 for genuine nuclear flares. Using ZTF observations of variability from known AGNs and supernovae we show how these sources can be separated from TDEs. A combination of light-curve shape, color, and location in the host galaxy can be used to select a clean TDE sample from multi-band optical surveys such as ZTF or the Large Synoptic Survey Telescope.