Kernel for IRF azimuth angle integration of the diffuse source model. More...

#include <GCTAResponse_helpers.hpp>

Inheritance diagram for cta_irf_diffuse_kern_phi:

Public Member Functions
	cta_irf_diffuse_kern_phi (const GCTAResponseIrf rsp, const GModelSpatial model, const GMatrix *rot, const double &zenith, const double &azimuth, const GEnergy &srcEng, const GTime &srcTime, const double &srcLogEng, const GEnergy &obsEng, const double &sin_theta, const double &cos_theta, const double &sin_ph, const double &cos_ph)

double	eval (const double &phi)
	Kernel for IRF azimuth angle integration of the diffuse source model. More...

Public Member Functions inherited from GFunction
	GFunction (void)
	Void constructor. More...

	GFunction (const GFunction &function)
	Copy constructor. More...

virtual	~GFunction (void)
	Destructor. More...

GFunction &	operator= (const GFunction &function)
	Assignment operator. More...

Protected Attributes
const GCTAResponseIrf *	m_rsp
	CTA response. More...

const GModelSpatial *	m_model
	Spatial model. More...

const GMatrix *	m_rot
	Rotation matrix. More...

double	m_zenith
	Zenith angle. More...

double	m_azimuth
	Azimuth angle. More...

GEnergy	m_srcEng
	True photon energy. More...

GTime	m_srcTime
	True photon arrival time. More...

double	m_srcLogEng
	True photon log energy. More...

GEnergy	m_obsEng
	Measured event energy. More...

double	m_sin_theta
	Sine of offset angle. More...

double	m_cos_theta
	Cosine of offset angle. More...

double	m_sin_ph
	Sine term in angular distance equation. More...

double	m_cos_ph
	Cosine term in angular distance equation. More...

GVector	m_native
	Pre-allocate memory for native coordinates. More...

GPhoton	m_photon
	Pre-allocate memory for a photon object. 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 IRF azimuth angle integration of the diffuse source model.

This class implements the computation of

\[ S_{\rm p}(\theta, \phi | E, t) \, Aeff(\theta, \phi) \, Edisp(\theta, \phi) \]

where

\(S_{\rm p}(\theta, \phi | E, t)\) is the diffuse model,
\(Aeff(\theta, \phi)\) is the effective area,
\(Edisp(\theta, \phi)\) is the energy dispersion,
\(\theta\) is the distance from the PSF centre, and
\(\phi\) is the azimuth angle.

Definition at line 852 of file GCTAResponse_helpers.hpp.

Constructor & Destructor Documentation

cta_irf_diffuse_kern_phi::cta_irf_diffuse_kern_phi	(	const GCTAResponseIrf *	rsp,
		const GModelSpatial *	model,
		const GMatrix *	rot,
		const double &	zenith,
		const double &	azimuth,
		const GEnergy &	srcEng,
		const GTime &	srcTime,
		const double &	srcLogEng,
		const GEnergy &	obsEng,
		const double &	sin_theta,
		const double &	cos_theta,
		const double &	sin_ph,
		const double &	cos_ph
	)

inline

Definition at line 854 of file GCTAResponse_helpers.hpp.

Member Function Documentation

double cta_irf_diffuse_kern_phi::eval ( const double & phi )

virtual

Kernel for IRF azimuth angle integration of the diffuse source model.

Parameters

[in] phi Azimuth angle around observed photon direction (radians).

Computes

\[ S_{\rm p}(\theta, \phi | E, t) \, Aeff(\theta, \phi) \, Edisp(\theta, \phi) \]

As the coordinates \((\theta, \phi)\) are given in the reference frame of the observed photon direction, some coordinate transformations have to be performed.

First, \((\theta, \phi)\) are transformed into the celestial reference frame using the rotation matrix.

Then, the offset angle of the true photon direction is computed in the camera system (so far we do not compute the azimuth angle as we assume an azimuthally symmetric response).

Todo:

Optimize computation of sky direction in native coordinates

Implement azimuth angle computation of true photon in camera

Replace (theta,phi) by (delta,alpha)

Implements GFunction.

Definition at line 1401 of file GCTAResponse_helpers.cpp.

References gammalib::acos(), GCTAResponseIrf::aeff(), GSkyDir::celvector(), cos(), GPhoton::dir(), GCTAResponseIrf::edisp(), GPhoton::energy(), GModelSpatial::eval(), gammalib::is_infinite(), gammalib::is_notanumber(), m_azimuth, m_cos_ph, m_cos_theta, m_model, m_native, m_obsEng, m_photon, m_rot, m_rsp, m_sin_ph, m_sin_theta, m_srcEng, m_srcLogEng, m_srcTime, m_zenith, sin(), GPhoton::time(), and GCTAResponseIrf::use_edisp().

Member Data Documentation

double cta_irf_diffuse_kern_phi::m_azimuth

protected

Azimuth angle.

Definition at line 888 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_diffuse_kern_phi::m_cos_ph

protected

Cosine term in angular distance equation.

Definition at line 896 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_diffuse_kern_phi::m_cos_theta

protected

Cosine of offset angle.

Definition at line 894 of file GCTAResponse_helpers.hpp.

Referenced by eval().

const GModelSpatial* cta_irf_diffuse_kern_phi::m_model

protected

Spatial model.

Definition at line 885 of file GCTAResponse_helpers.hpp.

Referenced by eval().

GVector cta_irf_diffuse_kern_phi::m_native

protected

Pre-allocate memory for native coordinates.

Definition at line 897 of file GCTAResponse_helpers.hpp.

Referenced by eval().

GEnergy cta_irf_diffuse_kern_phi::m_obsEng

protected

Measured event energy.

Definition at line 892 of file GCTAResponse_helpers.hpp.

Referenced by eval().

GPhoton cta_irf_diffuse_kern_phi::m_photon

protected

Pre-allocate memory for a photon object.

Definition at line 898 of file GCTAResponse_helpers.hpp.

Referenced by eval().

const GMatrix* cta_irf_diffuse_kern_phi::m_rot

protected

Rotation matrix.

Definition at line 886 of file GCTAResponse_helpers.hpp.

Referenced by eval().

const GCTAResponseIrf* cta_irf_diffuse_kern_phi::m_rsp

protected

CTA response.

Definition at line 884 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_diffuse_kern_phi::m_sin_ph

protected

Sine term in angular distance equation.

Definition at line 895 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_diffuse_kern_phi::m_sin_theta

protected

Sine of offset angle.

Definition at line 893 of file GCTAResponse_helpers.hpp.

Referenced by eval().

GEnergy cta_irf_diffuse_kern_phi::m_srcEng

protected

True photon energy.

Definition at line 889 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_diffuse_kern_phi::m_srcLogEng

protected

True photon log energy.

Definition at line 891 of file GCTAResponse_helpers.hpp.

Referenced by eval().

GTime cta_irf_diffuse_kern_phi::m_srcTime

protected

True photon arrival time.

Definition at line 890 of file GCTAResponse_helpers.hpp.

Referenced by eval().

double cta_irf_diffuse_kern_phi::m_zenith

protected

Zenith angle.

Definition at line 887 of file GCTAResponse_helpers.hpp.

Referenced by eval().

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

inst/cta/src/GCTAResponse_helpers.hpp
inst/cta/src/GCTAResponse_helpers.cpp

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation