-- > I am analyzing the data of a strong X-Ray source. After determining the > spectrum of the source, I subtracted the Marx-estimate of the source > emission from the data and a statistically highly significant residuum > remains with an event excess at 15''-50'' angular distances from the > source. > > Has anybody used in-flight data to compare the wings of the point spread > function with the predictions of the Marx simulations?Detailed comparison of the PSF wings with the models is an ongoing effort.
I've made a preliminary comparison of an HRC-S observation of Capella (no gratings), with:
. a raytrace based on the high fidelty SAOSAC optics model, using MARX 3.0 as the detector model . a raytrace based on MARX 3.0 (optics and detector)
Capella has a very small hydrogen column (N_HI = 1.8(+0.3,-0.1) x 10^{18} cm^2 (Linsky et al, Ap. J., 402, 694), so there will be no problem with an X-ray dust halo. The spectrum is pretty soft, though, predominantly <= 1 keV.
It appears that in this case, the MARX 3.0 simulation significantly underpredicts the Capella data beyond a few arcsec.
Terry Gaetz
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