The column density towards LMC X-1 | Astronomy & Astrophysics (A&A)

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Table 3:

Column density in units of $10^{22}~\rm cm^{-2}$ for the six observations and the sine fit, obtained with different continuum models.
Observation or fit	X2	S1	S3	C1	S2	X1	Sine fit
$\phi _{\rm orb}^{\rm (T3)}$	0.17-0.28	0.37-0.42	0.43-0.50	0.45-0.51	0.49-0.61	0.94-0.96	full orbit
`diskbb + powerlaw`^*	$\left(2.00^{+0.17}_{-0.19}\right)$ ^*	$\left(1.2^{+0.5}_{-0.2}\right)$ ^*	$\rm0.96^{+0.03}_{-0.02}$	$\left(1.25^{+0.04}_{-0.01}\right)$ ^*	$1.031\pm0.017$	$\left(1.81^{+0.06}_{-0.05}\right)$ ^*	$\left(1.43\pm0.43\right)$ ^*
`eqpair`	$1.279\pm0.005$	$\rm 1.17^{+0.15}_{-0.10}$	$1.02\pm0.02$	$\rm 1.065^{+0.000}_{-0.019}$	$1.088\pm0.017$	$\rm 1.191^{+0.006}_{-0.007}$	$1.15\pm0.15$
`simpl(kerrbb)`	$1.278\pm0.005$	$\rm 1.17^{+0.11}_{-0.10}$	$\rm 1.01^{+0.03}_{-0.02}$	$\rm 1.085^{+0.018}_{-0.016}$	$1.088\pm0.017$	$\rm 1.187^{+0.014}_{-0.012}$	$1.15\pm0.14$
`simpl(diskbb)`	$1.288\pm0.016$ $^{\dagger}$	$\rm 1.14^{+0.15}_{-0.11}$	$0.97\pm0.02$	$\rm 1.009^{+0.018}_{-0.017}$	$1.038\pm0.017$	$\rm 1.133^{+0.005}_{-0.004}$	$1.10\pm0.18$

Notes. Quoted errors are statistical uncertainties at the 90% confidence level for the observations, but semi-amplitudes for the sine fits.
^(*) The diskbb + powerlaw model overestimates $N_{\rm H}$ more, the more the powerlaw contributes at low energies, see text.
$^{(\dagger)}$ As the lack of data above 2 keV did not allow us to constrain the power law with the simpl model, we only used diskbb.

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