A Library of Synthetic X-ray Spectra for Fitting Tidal Disruption Events

Sixiang Wen; Peter G. Jonker; Nicholas C. Stone; Ann I. Zabludoff; Zheng Cao

doi:10.3847/1538-4357/ac70c5

paper

A Library of Synthetic X-ray Spectra for Fitting Tidal Disruption Events

arXiv:2204.03922 · doi:10.3847/1538-4357/ac70c5

Abstract

We present a tabulated version of our slim disk model for fitting tidal disruption events (TDEs). We create a synthetic X-ray spectral library by ray-tracing stationary general relativistic slim disks and including gravitational redshift, Doppler, and lensing effects self-consistently. We introduce the library to reduce computational expense and increase access for fitting future events. Fitting requires interpolation between the library spectra; the interpolation error in the synthetic flux is generally $< 10%$ (it can rise to $40%$ when the disk is nearly edge-on). We fit the X-ray spectra of the TDEs ASASSN-14li and ASASSN-15oi, successfully reproducing our earlier constraints on black hole mass $M_{∙}$ and spin $a_{∙}$ from full on-the-fly ray-tracing. We use the library to fit mock observational data to explore the degeneracies among parameters, finding that 1) hotter thermal disk and edge-on inclination angle spectra offer tighter constraints on $M_{∙}$ and $a_{∙}$ ; 2) the constraining power of spectra on $M_{∙}$ and $a_{∙}$ increases as a power-law with the number of X-ray counts, and the index of the power law is higher for hotter thermal disk spectra; 3) multi-epoch X-ray spectra partially break the degeneracy between $M_{∙}$ and $a_{∙}$ ; 4) the time-dependent level of X-ray absorption can be constrained from spectral fitting. The tabulated model and slim disk model are {\href{https://doi.org/10.25739/hfhz-xn60}{here.}

Accepted for Publication in ApJ

A Library of Synthetic X-ray Spectra for Fitting Tidal Disruption Events

Abstract

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