High resolution X-ray spectroscopy of SN 1987 A: monitoring with XMM-Newton

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Volume 515 (June 2010)

A&A, 515 (2010) A5

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Table 3:

Results from the VPSHOCK+VPSHOCK model fits.
Parameter	May 2003	Jan. 2007	Jan. 2008	Jan. 2009
kT₁(keV)	$\rm0.41_{-0.01}^{+0.01}$	$\rm0.52_{-0.003}^{+0.002}$	$\rm0.53_{-0.001}^{+0.002}$	$\rm0.54_{-0.001}^{+0.002}$
kT₂(keV)	$\rm 2.89_{-0.19}^{+0.19}$	$\rm 2.43_{-0.06}^{+0.06}$	$\rm 2.50_{-0.05}^{+0.05}$	$\rm 2.38_{-0.05}^{+0.04}$
EM₁^a	$\rm 4.09_{-0.1}^{+0.1}$	$\rm 17.83_{-0.12}^{+0.11}$	$\rm 23.45_{-0.12}^{+0.13}$	$\rm 28.37_{-0.14}^{+0.15}$
EM₂^a	$\rm 1.06_{-0.03}^{+0.03}$	$\rm 2.95_{-0.05}^{+0.04}$	$\rm 3.91_{-0.05}^{+0.06}$	$\rm 4.91_{-0.07}^{+0.05}$
$\tau_{{\rm u,}1}$ ^b	$\rm 3.25_{-0.26}^{+0.29}$	$\rm 4.82_{-0.12}^{+0.14}$	$\rm 6.03_{-0.14}^{+0.19}$	$\rm 6.86_{-0.18}^{+0.21}$
$\tau_{{\rm u,}2}$ ^b	$\rm 1.33_{-0.1}^{+0.12}$	$\rm 1.93_{-0.1}^{+0.11}$	$\rm 2.02_{-0.1}^{+0.09}$	$\rm 2.22_{-0.09}^{+0.13}$
$\sigma _0$ (eV)	$\rm 3.51_{-0.94}^{+1.11}$	$\rm 1.51_{-0.4}^{+0.25}$	$\rm 1.58_{-0.29}^{+0.31}$	$\rm 1.43_{-0.29}^{+0.33}$
${\alpha}$	$\rm 1.10_{-0.76}^{+0.74}$	$\rm 2.64_{-0.45}^{+0.69}$	$\rm 3.15_{-0.63}^{+0.43}$	$\rm 3.10_{-0.52}^{+0.6}$

Notes. Errors for $\Delta \chi ^2=2.71$ confidence range.
^(a) $EM = \int n_{\rm e} n_{\rm H} {\rm d}V$ in 10⁵⁸ cm^-3, a distance of 50 kpc is assumed.
^(b) $\tau_{\rm u}$ : upper limit on the ionization time range in 10¹¹ cm^-3 s.

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