GammaLib  1.7.0.dev
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Pages
cta_irf_radial_kern_omega Class Reference

Kernel for radial model azimuth angle IRF integration. More...

#include <GCTAResponse_helpers.hpp>

Inheritance diagram for cta_irf_radial_kern_omega:
GFunction

Public Member Functions

 cta_irf_radial_kern_omega (const GCTAResponseIrf *rsp, const double &zenith, const double &azimuth, const GEnergy &srcEng, const GEnergy &obsEng, const double &zeta, const double &lambda, const double &omega0, const double &rho, const double &cos_psf, const double &sin_psf, const double &cos_ph, const double &sin_ph)
 
double eval (const double &omega)
 Kernel for radial model azimuth angle IRF integration. More...
 
- Public Member Functions inherited from GFunction
 GFunction (void)
 Void constructor. More...
 
 GFunction (const GFunction &function)
 Copy constructor. More...
 
virtual ~GFunction (void)
 Destructor. More...
 
GFunctionoperator= (const GFunction &function)
 Assignment operator. More...
 

Protected Attributes

const GCTAResponseIrfm_rsp
 CTA response. More...
 
double m_zenith
 Zenith angle. More...
 
double m_azimuth
 Azimuth angle. More...
 
GEnergy m_srcEng
 True photon energy. More...
 
GEnergy m_obsEng
 Measured event energy. More...
 
double m_zeta
 Distance model centre - measured photon. More...
 
double m_lambda
 Distance model centre - pointing. More...
 
double m_omega0
 Azimuth of pointing in model system. More...
 
double m_rho
 ... More...
 
double m_cos_psf
 Cosine term for PSF offset angle computation. More...
 
double m_sin_psf
 Sine term for PSF offset angle computation. More...
 
double m_cos_ph
 Cosine term for photon offset angle computation. More...
 
double m_sin_ph
 Sine term for photon offset angle computation. More...
 

Additional Inherited Members

- Protected Member Functions inherited from GFunction
void init_members (void)
 Initialise class members. More...
 
void copy_members (const GFunction &function)
 Copy class members. More...
 
void free_members (void)
 Delete class members. More...
 

Detailed Description

Kernel for radial model azimuth angle IRF integration.

This class implements the computation of the IRF in the reference frame of the radial source model. It computes

\[ IRF(\rho, \omega) \]

where

  • \(\rho\) is the distance from the model centre, and
  • \(\omega\) is the azimuth angle is the position angle with respect to the connecting line between the model centre and the observed photon arrival direction.

Definition at line 246 of file GCTAResponse_helpers.hpp.

Constructor & Destructor Documentation

cta_irf_radial_kern_omega::cta_irf_radial_kern_omega ( const GCTAResponseIrf rsp,
const double &  zenith,
const double &  azimuth,
const GEnergy srcEng,
const GEnergy obsEng,
const double &  zeta,
const double &  lambda,
const double &  omega0,
const double &  rho,
const double &  cos_psf,
const double &  sin_psf,
const double &  cos_ph,
const double &  sin_ph 
)
inline

Definition at line 248 of file GCTAResponse_helpers.hpp.

Member Function Documentation

double cta_irf_radial_kern_omega::eval ( const double &  omega)
virtual

Kernel for radial model azimuth angle IRF integration.

Parameters
[in]omegaAzimuth angle (radians).

Computes the kernel

\[ IRF(\rho,\omega) \]

for the azimuth angle integration of radial models.

From the model coordinates \((\rho,\omega)\), the method computes the angle between the true ( \(\vec{p}\)) and observed ( \(\vec{p'}\)) photon arrival direction using

\[\delta = \arccos(\cos \rho \cos \zeta + \sin \rho \sin \zeta \cos \omega)\]

where \(\zeta\) is the angular distance between the observed photon arrival direction \(\vec{p'}\) and the model centre \(\vec{m}\). This angle \(\delta\) is used to compute the \(PSF(\delta)\) value.

The method computes also the angle \(\theta\) between the observed photon arrival direction \(\vec{p'}\) and the camera pointing \(\vec{d}\) using

\[\theta = \arccos(\cos \rho \cos \lambda + \sin \rho \sin \lambda \cos \omega_0 - \omega)\]

where \(\lambda\) is the angular distance between the model centre \(\vec{m}\) and the camera pointing direction \(\vec{d}\). The angle \(\theta\) is used in the computation of the IRF (no azimuthal dependence is so far implemented for the IRF computation).

Implements GFunction.

Definition at line 473 of file GCTAResponse_helpers.cpp.

References gammalib::acos(), GCTAResponseIrf::aeff(), cos(), GCTAResponseIrf::edisp(), gammalib::is_infinite(), gammalib::is_notanumber(), GEnergy::log10TeV(), m_azimuth, m_cos_ph, m_cos_psf, m_obsEng, m_omega0, m_rsp, m_sin_ph, m_sin_psf, m_srcEng, m_zenith, GCTAResponseIrf::psf(), and GCTAResponseIrf::use_edisp().

Member Data Documentation

double cta_irf_radial_kern_omega::m_azimuth
protected

Azimuth angle.

Definition at line 278 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_radial_kern_omega::m_cos_ph
protected

Cosine term for photon offset angle computation.

Definition at line 287 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_radial_kern_omega::m_cos_psf
protected

Cosine term for PSF offset angle computation.

Definition at line 285 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_radial_kern_omega::m_lambda
protected

Distance model centre - pointing.

Definition at line 282 of file GCTAResponse_helpers.hpp.

GEnergy cta_irf_radial_kern_omega::m_obsEng
protected

Measured event energy.

Definition at line 280 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_radial_kern_omega::m_omega0
protected

Azimuth of pointing in model system.

Definition at line 283 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_radial_kern_omega::m_rho
protected

...

Definition at line 284 of file GCTAResponse_helpers.hpp.

const GCTAResponseIrf* cta_irf_radial_kern_omega::m_rsp
protected

CTA response.

Definition at line 276 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_radial_kern_omega::m_sin_ph
protected

Sine term for photon offset angle computation.

Definition at line 288 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_radial_kern_omega::m_sin_psf
protected

Sine term for PSF offset angle computation.

Definition at line 286 of file GCTAResponse_helpers.hpp.

Referenced by eval().

GEnergy cta_irf_radial_kern_omega::m_srcEng
protected

True photon energy.

Definition at line 279 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_radial_kern_omega::m_zenith
protected

Zenith angle.

Definition at line 277 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_radial_kern_omega::m_zeta
protected

Distance model centre - measured photon.

Definition at line 281 of file GCTAResponse_helpers.hpp.


The documentation for this class was generated from the following files: