The models available in PIMMS are a power law (PL), a thermal bremsstrahlung (TB), a black body (BB), and a number of Raymond-Smith models (RSQ60...RSQ85), all absorbed at low energy by a column of cold gas. Other models can be imported. To estimate a count rate one has to 1) specify the instrument; 2) select a model; specify the normalization of the model. This is an example:*** Small PIMMS version s2.1a (XTE compatible) ***
1995 Apr 03 release
(this version does not simulate images)
Reading mission directory, please wait
* Current model is BREMSSTRAHLUNG, kT= 10.0000 keV; NH = 1.000E+21
<--- Use 'MODEL' command to change
* By default, input rate is taken to be
Flux ( 2.000- 10.000 keV) in ergs/cm/cm/s
<--- Use 'FROM' command to change the default
* Simulation product will be
Count rate in XTE PCA
<--- Use 'INSTRUMENT' command to switch to another instrument
pimms > instrument sax lecs
pimms > mo pl 2.5 3e20
pimms > from flux ergs 0.1-2
pimms > go 2e-11
* For power law model with photon index = 2.5000; NH = 3.000E+20
and a flux ( 0.100- 2.000keV) of 2.000E-11 ergs/cm/cm/s
(Model normalization = 6.302E-03)
* PIMMS predicts 3.538E-01 cps with SAX LECS
* Results in 2 SAX LECS bands are:
* Band Source BGD 5-sigma
* keV cps cps detection (s)
0.1-10 0.354 0.026 75.89
0.1-1 0.131 0.004 201.60
* Assumed 6 arcmin radius (80 % source region at 0.284 keV)
This is another example:
*** Small PIMMS version s2.1a (XTE compatible) ***
1995 Apr 03 release
(this version does not simulate images)
Reading mission directory, please wait
* Current model is BREMSSTRAHLUNG, kT= 10.0000 keV; NH = 1.000E+21
<--- Use 'MODEL' command to change
* By default, input rate is taken to be
Flux ( 2.000- 10.000 keV) in ergs/cm/cm/s
<--- Use 'FROM' command to change the default
* Simulation product will be
Count rate in XTE PCA
<--- Use 'INSTRUMENT' command to switch to another instrument
pimms > instrument sax pds
pimms > mo pl 1.5 1e21
pimms > from ginga lac top
pimms > go 10
* For power law model with photon index = 1.5000; NH = 1.000E+21
and 1.000E+01 cps in GINGA LAC TOP
(Model normalization = 4.275E-03)
* PIMMS predicts 8.385E-01 cps with SAX PDS
* Results in 3 SAX PDS bands are:
* Band Source BGD 5-sigma
* keV cps cps detection (s)
15-300 0.838 32.800 2362.54
15-80 0.702 10.400 1092.03
80-300 0.137 22.400 59961.84
* !!!NOTE!!! that using the PDS in the standard rocking mode half of the
observing time is allocated to monitor the bgd
Please send questions/problem reports to: helpdesk@sax.sdc.asi.itLast Revised: July 12, 1995