Michael Mayer / ctools

Commit 7fbb63fe431ece7fa22ffb7458d4ffebd25b097e

Authored by Jürgen Knödlseder
1 parent 3b405d4c

Correct estimate photon rate for diffuse map cube

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Showing 2 changed files with 80 additions and 12 deletions
src/ctobssim/ctobssim.cpp
  View file @7fbb63f
... ... @@ -762,7 +762,9 @@ void ctobssim::simulate_source(GCTAObservation* obs, const GModels& models,
762 762 // number of simulated photons to m_max_photons.
763 763 // The photon rate is estimated from the model flux
764 764 // and used to set the duration of the time slice.
765   - double flux = model->spectral()->flux(emin, emax);
  765 + //double flux = model->spectral()->flux(emin, emax);
  766 + double flux = get_model_flux(model, emin, emax,
  767 + dir, rad);
766 768 double rate = flux * m_area;
767 769 double duration = 1800.0; // default: 1800 sec
768 770 if (rate > 0.0) {
... ... @@ -960,6 +962,67 @@ void ctobssim::simulate_source(GCTAObservation* obs, const GModels& models,
960 962  
961 963  
962 964 /***********************************************************************//**
  965 + * @brief Determine sky model flux
  966 + *
  967 + * @param[in] model Sky model.
  968 + * @param[in] emin Minimum energy.
  969 + * @param[in] emin Maximum energy.
  970 + * @param[in] centre Centre of region for photon rate determination.
  971 + * @param[in] radius Radius of region for photon rate determination.
  972 + * @return Model flux (photons/cm2/sec).
  973 + ***************************************************************************/
  974 +double ctobssim::get_model_flux(const GModelSky* model,
  975 + const GEnergy& emin,
  976 + const GEnergy& emax,
  977 + const GSkyDir& centre,
  978 + const double& radius)
  979 +{
  980 + // Initialise de-allocation flag
  981 + bool free_spectral = false;
  982 +
  983 + // Get pointer to spectral model
  984 + const GModelSpectral* spectral = model->spectral();
  985 +
  986 + // If the spatial model is a diffuse cube then create a node function
  987 + // spectral model that is the product of the diffuse cube node function
  988 + // and the spectral model evaluated at the energies of the node function
  989 + GModelSpatialDiffuseCube* cube = dynamic_cast<GModelSpatialDiffuseCube*>(model->spatial());
  990 + if (cube != NULL) {
  991 +
  992 + // Set MC cone
  993 + cube->set_mc_cone(centre, radius);
  994 +
  995 + // Allocate node function to replace the spectral component
  996 + GModelSpectralNodes* nodes = new GModelSpectralNodes(cube->spectrum());
  997 + for (int i = 0; i < nodes->nodes(); ++i) {
  998 + GEnergy energy = nodes->energy(i);
  999 + GTime time; // Dummy time
  1000 + double intensity = nodes->intensity(i);
  1001 + double norm = spectral->eval(energy, time);
  1002 + nodes->intensity(i, norm*intensity);
  1003 + }
  1004 +
  1005 + // Signal that node function needs to be de-allocated later
  1006 + free_spectral = true;
  1007 +
  1008 + // Set the spectral model pointer to the node function
  1009 + spectral = nodes;
  1010 +
  1011 + } // endif: spatial model was a diffuse cube
  1012 +
  1013 + // Compute flux within [emin, emax] in model from spectral
  1014 + // component (units: ph/cm2/s)
  1015 + double flux = spectral->flux(emin, emax);
  1016 +
  1017 + // Free spectral model if required
  1018 + if (free_spectral) delete spectral;
  1019 +
  1020 + // Return model flux
  1021 + return flux;
  1022 +}
  1023 +
  1024 +
  1025 +/***********************************************************************//**
963 1026 * @brief Simulate background events from model
964 1027 *
965 1028 * @param[in] obs Pointer on CTA observation.
... ...
src/ctobssim/ctobssim.hpp
  View file @7fbb63f
... ... @@ -71,20 +71,25 @@ public:
71 71  
72 72 protected:
73 73 // Protected methods
74   - void init_members(void);
75   - void copy_members(const ctobssim& app);
76   - void free_members(void);
77   - void get_parameters(void);
78   - void simulate_source(GCTAObservation* obs,
  74 + void init_members(void);
  75 + void copy_members(const ctobssim& app);
  76 + void free_members(void);
  77 + void get_parameters(void);
  78 + void simulate_source(GCTAObservation* obs,
79 79 const GModels& models,
80 80 GRan& ran,
81 81 GLog* wrklog = NULL);
82   - void simulate_background(GCTAObservation* obs,
83   - const GModels& models,
84   - GRan& ran,
85   - GLog* wrklog = NULL);
86   - void save_fits(void);
87   - void save_xml(void);
  82 + double get_model_flux(const GModelSky* model,
  83 + const GEnergy& emin,
  84 + const GEnergy& emax,
  85 + const GSkyDir& centre,
  86 + const double& radius);
  87 + void simulate_background(GCTAObservation* obs,
  88 + const GModels& models,
  89 + GRan& ran,
  90 + GLog* wrklog = NULL);
  91 + void save_fits(void);
  92 + void save_xml(void);
88 93  
89 94 // User parameters
90 95 std::string m_outevents; //!< Output events file
... ...