Simulation of NGC 253
NGC 253 is a starburst galaxy containing diffuse, extended thermal emission
and multiple point sources. As a first attempt to simulate this source,
the SIS0 spectrum from a 6' region (composite diffuse + point source flux) was
fit with a power-law plus gaussian lines model, providing a good fit
(see figure). The
source photons were then
selected from a PSPC image
(without background subtraction) assuming the
power-law + lines spectrum for all photons. This crude approach produced
an image similar to the actual observation, shown below. The exposure was 37
ks. A crude simulation of an Astro-E observations is also shown,
created by
improving the spatial resolution in the ASCA simulation by 3.75.
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Actual ASCA PV SIS0 Observation |
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Simulated ASCA SIS0 Observation |
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Simulated Astro-E Observation (with an ASCA SIS detector)
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