A quick check on appropriateness of spectral fits. Like with AIA, we can plot the NuSTAR loci curves, given here by the rate (counts s-1) divided by the appropriate temperature response (counts s-1 cm3) at a given energy. Select a variety of energies here in order to see which is most influential in contributing to the spectrum.
If a loci curve crosses or comes close to the point determined by the spectral fitting, it agrees well with that solution, which was determined mostly using counts in the 2.5-4.5 keV range. Therefore the loci curves in the same range should be close to the solution.
The potential influence of counts at other energies on the spectral fit can be seen from their loci curves (e.g. 1.5-2 keV curve).
Orbit 6
NuSTAR observation of 2020-09-12, orbit 6, with temperature and emission measure calculated by spectral fit between 17:17 and 17:19.
_,o6rate,o6tresp=gen_nustar_tresp(nsid='80610206001',orbit='6',time='1717_1719')
obs_params['EM_spec_cm-3']=1.07e44
obs_params['EM_err_cm-3']=[6.62e43,1.47e44]
obs_params['T_spec_MK']=3.264
obs_params['T_err_MK']=[3.193,3.431]
Orbit 8
NuSTAR observation of 2020-09-12, orbit 8, with temperature and emission measure calculated by spectral fit between 20:39 and 20:42.
obs_params['EM_spec_cm-3']=1.03e43
obs_params['EM_err_cm-3']=[7.17e42,1.32e43]
obs_params['T_spec_MK']=3.244
obs_params['T_err_MK']=[3.195,3.347]
Orbit 10
NuSTAR observation of 2020-09-13, orbit 10, with temperature and emission measure calculated by spectral fit between 00:08 and 00:15.
_,o10rate,o10tresp=gen_nustar_tresp(nsid='80610210001',orbit='10',time='0008_0015')
obs_params['EM_spec_cm-3']=8.46e42
obs_params['EM_err_cm-3']=[0,4.34e43]
obs_params['T_spec_MK']=3.206
obs_params['T_err_MK']=[2.618,3.555]
Details
To calculate expected flux (per AIA pixel) given a temperature and emission measure see previous post.
To calculate NuSTAR response functions, run the notebook here with the .arf, .rmf, and .pha files associated with a given spectral fitting of an observation.