Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tidal disruption event discs are larger than they seem: removing
  systematic biases in TDE X-ray spectral modelling   The physical sizes of TDE accretion discs are regularly inferred, from the
modelling of the TDEs X-ray spectrum as a single temperature blackbody, to be
smaller than the plausible event horizons of the black holes which they occur
around - a clearly unphysical result. In this Letter we demonstrate that the
use of single-temperature blackbody functions results in the systematic
underestimation of TDE accretion disc sizes by as much as an
order-of-magnitude. In fact, the radial `size' inferred from fitting a single
temperature blackbody to an observed accretion disc X-ray spectrum does not
even positively correlate with the physical size of that accretion disc. We
further demonstrate that the disc-observer inclination angle and absorption of
X-ray photons may both lead to additional underestimation of the radial sizes
of TDE discs, but by smaller factors. To rectify these issues we present a new
fitting function which accurately reproduces the size of an accretion disc from
its 0.3-10 keV X-ray spectrum. Unlike traditional approaches, this new fitting
function does not assume that the accretion disc has reached a steady state
configuration, an assumption which is unlikely to be satisfied by most TDEs. An
XSPEC implementation of this new fitting function is available at
github.com/andymummeryastro/TDEdiscXraySpectrum.

18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: stat