XMM-Newton Science Analysis System
evigweight (evigweight-1.8) [xmmsas_20190531_1155-18.0.0]
The spectroscopic model of the source gives
,
the number of photons received per cm
and per second at the earth,
from sky position
and at energy
(differential per solid angle and energy).
The number of photons,
, detected (per second)
in pixel
and in
PI energy bin
centered at
is obtained by multiplying
by the effective area and applying the response matrix:
![\begin{displaymath}
m_{detx,dety}(I) \; = \; \int_e \: R_{detx,dety}(e,I) \: A_{...
...y}(e)
\: s_{\alpha,\delta}(e) \: \mathrm d e \: \Delta \Omega
\end{displaymath}](img9.png) |
(1) |
is the effective area at position
for energy
and includes all instrumental effects (telescope, RGA, filter,
detector).
is the redistribution of photons of energy
at position
into PI bin
.
The correspondence between sky position and detector
coordinates depends on the telescope's pointing.
In theory this correspondence is not direct, but via a convolution
with the Point Spread Function. This complication is ignored here
(see Sect.3.7).
XMM-Newton SOC/SSC -- 2019-06-02