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Fig. 2.

image

Later X-ray light curves of TDEs in 0.3-2 keV. The x-axis indicates the time since the flare occurred; for J1342, it is about 1 year before the SDSS optical spectral observation. The total 0.3–2 keV luminosities of J1342 is labeled as a circle symbol; the 0.3–2 keV luminosities of the soft PL component of J1342 is labeled as a pentagram symbol. The later X-ray light curves of other long-lived TDEs are also shown, which include RX J1242.6-1119, RX J1624.9+7554, NGC 5905 (Vaughan et al. 2004), RBS 1032 (Maksym et al. 2014), 3XMM J1500+0154 (Lin et al. 2017a), 3XMM J2150−0551 (Lin et al. 2018, 2020), 2XMM J1231+1106 (Lin et al. 2017b), and GSN 069 (Shu et al. 2018). The luminosities of XMM J1500+0154 are in 0.34–11.5 keV, of RBS 1032 are in 0.1–2.4 keV, and of XMM J2150-0551 are the bolometric luminosities from the disk model; the luminosities of others are converted to those in the 0.3–2 keV band. The later light curves following the power law decline as t−5/3 are shown as dashed lines; the others are shown as dotted lines. A power law decline as t−5/12 is also shown as a dot-dashed line. The theoretical IMBH-TDE light curve (Chen & Shen 2018) is shown as a solid line.

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