Example 3. Estimating XTE count rates II
*** PIMMS version 4.11 ***
2020 Feb 27th Release
Reading mission directory, please wait
* Current model is BREMSSTRAHLUNG, kT= 10.0000 keV; NH = 1.000E+21
<--- Use 'MODEL' command to change
and 'PLASMA' command to switch among APEC/mekal/RS
* 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 CHANDRA ACIS-I
<--- Use 'INSTRUMENT' command to switch to another instrument
PIMMS > from ginga lac both
PIMMS > mo pl 1.5 15 30 1e22
PIMMS > inst xte pca
PIMMS > go 500
* For power-law model with high-energy cut-off with
Index = 1.50, Ecut 15.00 keV, E(e-folding) 30.00 keV; NH = 1.000E+22
and 5.000E+02 cps in GINGA LAC BOTH
(Internal model normalization = 1.950E-01)
* PIMMS predicts 1.434E+02 cps with XTE PCA
(Count rate is per PCU)
%%% With 3 PCUs operational:
(Use these numbers in RPS)
PIMMS predicts 430.284 cps from the source plus 91.380 background cps
5-sigma detection will be achieved in 0.070s
(or in 0.070s with 1% systematic uncertainties in bgd)
Results in the 6 canonical XTE PCA bands are:
Channels Nominal Source BGD 5-sigma (+1%)
E (keV) (cps) (cps) detection (s)
0- 13 0.00- 6.14 159.874 10.56 0.167 ( 0.167)
14- 17 6.14- 7.90 64.852 3.46 0.406 ( 0.406)
18- 23 7.90- 10.5 74.181 4.56 0.358 ( 0.358)
24- 35 10.5- 15.8 82.633 7.87 0.331 ( 0.331)
36- 49 15.8- 22.1 33.182 8.90 0.955 ( 0.956)
50-249 22.1-116.0 15.562 56.05 7.393 ( 7.641)
%%% ...and with 2 PCUs operational:
PIMMS predicts 286.856 cps from the source plus 60.920 background cps
5-sigma detection will be achieved in 0.106s
(or in 0.106s with 1% systematic uncertainties in bgd)
Results in the 6 canonical XTE PCA bands are:
Channels Nominal Source BGD 5-sigma (+1%)
E (keV) (cps) (cps) detection (s)
0- 13 0.00- 6.14 106.582 7.04 0.250 ( 0.250)
14- 17 6.14- 7.90 43.235 2.31 0.609 ( 0.609)
18- 23 7.90- 10.5 49.454 3.04 0.537 ( 0.537)
24- 35 10.5- 15.8 55.089 5.24 0.497 ( 0.497)
36- 49 15.8- 22.1 22.121 5.93 1.433 ( 1.433)
50-249 22.1-116.0 10.375 37.37 11.089 ( 11.461)
PIMMS > inst xte hexte def
PIMMS > go 500
* For power-law model with high-energy cut-off with
Index = 1.50, Ecut 15.00 keV, E(e-folding) 30.00 keV; NH = 1.000E+22
and 5.000E+02 cps in GINGA LAC BOTH
(Internal model normalization = 1.950E-01)
* PIMMS predicts 1.789E+01 cps with XTE HEXTE DEFAULT
(Source-only count rate in 1 cluster; BGD rate is 73.1 per cluster)
5-sigma detection will be achieved in 14.7s
Results in the 4 canonical XTE HEXTE bands are:
(per HEXTE cluster)
Channels Nominal Source BGD 5-sigma
E (keV) (cps) (cps) detection (s)
5- 29 12- 30 13.6 11.86 5.6
30- 61 30- 62 3.6 17.93 86.4
62-125 62- 126 6.56E-01 21.94 3004.3
126-250 126- 250 1.35E-02 21.35 6.88E+06
(The default 16-s rocking cycle is assumed for detection time)
PIMMS > quit
In this case, a special version of the power law model (with high
energy cut-off) is used, by specifying index, cut-off energy and
e-folding energy, as well as NH, on the command line. User then
calculated PCA and HEXTE count rates for a 500 cps Ginga LAC source.
Example 4. Estimating ROSAT PSPC count rates
*** PIMMS version 4.11 ***
2020 Feb 27th Release
Reading mission directory, please wait
* Current model is BREMSSTRAHLUNG, kT= 10.0000 keV; NH = 1.000E+21
<--- Use 'MODEL' command to change
and 'PLASMA' command to switch among APEC/mekal/RS
* 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 CHANDRA ACIS-I
<--- Use 'INSTRUMENT' command to switch to another instrument
PIMMS > from flux ergs 0.1-4
PIMMS > mo plasma 6.65 logt 0.6 3e19
PIMMS > inst rosat pspc open
PIMMS > go 5e-12
* For PLASMA (APEC) model with
kT= 0.3849keV (logT= 6.65), Abund=0.6; NH = 3.000E+19
and a flux ( 0.100- 4.000keV) of 5.000E-12 ergs/cm/cm/s
(Internal model normalization = 3.798E-03)
* PIMMS predicts 7.389E-01 cps with ROSAT PSPC OPEN
PIMMS > inst rosat pspc r6r7
PIMMS > go 5e-12
* For PLASMA (APEC) model with
kT= 0.3849keV (logT= 6.65), Abund=0.6; NH = 3.000E+19
and a flux ( 0.100- 4.000keV) of 5.000E-12 ergs/cm/cm/s
(Internal model normalization = 3.798E-03)
* PIMMS predicts 1.207E-01 cps with ROSAT PSPC R6R7
PIMMS > quit
In this example, 0.6 Solar abundance, logT=6.65 APEC model
with an absorption of 3x1019 cm-2 is used to estimate
ROSAT PSPC count rates (total and a combination of the Snowden R bands)
for a 5x10-12 ergs cm-2s-1 source.
Next: Using Multi-component Models
