X-ray Study Of Tidal Disruption Events SDSS J134244+053056

SDSS J134244.4+053056 is a tidal disruption event candidate with strong temporal coronal line emitters and long fading mid-infrared dust echo.We present detailed analysis of X-ray emission from Swift/XRT observation in 2009 and the most recently XMM-Newton/pn observation in 2020.Both of the two spectra can be modelled with two components,hard and soft.While no significant variability is detected in the hard component above 2 keV between these two observations,the soft X-ray emission in 0.3-2 keV varies by a factor of?5.The luminosity of this soft component fade from?1.8 × 1041 to?3.7 × 1040 erg s-1 from observation in Swift to that of XMMNewton,which is 8 and 19 years later after the outburst occurred.The evolution of luminosity matches well with the t-5/3 decline law,with a soft X-ray peak luminosity of 1044 erg s-1 at the time of the optical flare.Furthermore,the spectra of the soft component harden in the decay phase,with the photon index ? varying fro?4.8 to?3.7.Additionally,by comparing the BH mass estimate between M-? correlation,H?emission and the fundamental plane relation of BH accretion,we find a value of?105 M? is favored.If so,combining with its X-ray spectral variation,luminosity evolution and the further support from the theory,we suggest that SDSS J134244.4+053056 is a long-living tidal disruption event candidate with an intermediate-mass black hole.In addition,we present the X-ray analysis of the tidal disruption event candidate in ultraluminous infrared galaxies F01004-2237.Comparing the soft X-ray luminosity of Chandra and XMM-Newton observed in 2004 and 2009,We found the soft X-rays(0.3-2 keV)in F01004-2237 varyed from 2.50×1041 erg s-1 to 1.02 × 1042 erg s-1,which is vary by a factor of?4,4.Additionally,the spectral slope in the XMM-Newton/pn spectrum is ?=2.6 +0.2-0.1 which is softer compare to that of ?=1.4±0.5 in Chandra spectrum.Furthermore,the X-ray observation of XMM-Newton is very close to the optical outburst(<0.5 yr).We speculate that the brighten and soften behavior in XMM-Newton observation may be related to the optical TDE outburst,this work is still on processing.