GModelSpectralPlawPhotonFlux.hpp
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/***************************************************************************
* GModelSpectralPlawPhotonFlux.hpp - Spectral power law model class *
* ----------------------------------------------------------------------- *
* copyright (C) 2011-2018 by Juergen Knoedlseder *
* ----------------------------------------------------------------------- *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
* *
***************************************************************************/
/**
* @file GModelSpectralPlawPhotonFlux.hpp
* @brief Flux normalized power law spectral model class interface definition
* @author Juergen Knoedlseder
*/
#ifndef GMODELSPECTRALPLAWPHOTONFLUX_HPP
#define GMODELSPECTRALPLAWPHOTONFLUX_HPP
/* __ Includes ___________________________________________________________ */
#include <string>
#include "GModelSpectral.hpp"
#include "GModelPar.hpp"
#include "GEnergy.hpp"
/* __ Forward declarations _______________________________________________ */
class GRan;
class GTime;
class GXmlElement;
/***********************************************************************//**
* @class GModelSpectralPlawPhotonFlux
*
* @brief Photon flux normalized power law spectral model class
*
* This class implements a power law spectrum. The model is defined by
*
* \f[
* S_{\rm E}(E | t) = {\tt m\_flux}
* \frac{{\tt m\_index}+1}
* {{\tt e\_max}^{{\tt m\_index}+1} -
* {\tt e\_min}^{{\tt m\_index}+1}}
* E^{\tt m\_index}
* \f]
*
* for \f${\tt m\_index} \ne -1\f$ and
*
* \f[
* S_{\rm E}(E | t) =
* \frac{{\tt m\_flux}}
* {\log {\tt e\_max} - \log {\tt e\_min}}
* E^{\tt m\_index}
* \f]
*
* for \f${\tt m\_index} = -1\f$, where
* - \f${\tt e\_min}\f$ is the minimum energy of an interval,
* - \f${\tt e\_max}\f$ is the maximum energy of an interval,
* - \f${\tt m\_flux}\f$ is the photon flux between
* \f${\tt e\_min}\f$ and \f${\tt e\_max}\f$, and
* - \f${\tt m\_index}\f$ is the spectral index.
***************************************************************************/
class GModelSpectralPlawPhotonFlux : public GModelSpectral {
public:
// Constructors and destructors
GModelSpectralPlawPhotonFlux(void);
GModelSpectralPlawPhotonFlux(const std::string& type,
const std::string& flux,
const std::string& index,
const std::string& emin,
const std::string& emax);
GModelSpectralPlawPhotonFlux(const double& flux,
const double& index,
const GEnergy& emin,
const GEnergy& emax);
explicit GModelSpectralPlawPhotonFlux(const GXmlElement& xml);
GModelSpectralPlawPhotonFlux(const GModelSpectralPlawPhotonFlux& model);
virtual ~GModelSpectralPlawPhotonFlux(void);
// Operators
virtual GModelSpectralPlawPhotonFlux& operator=(const GModelSpectralPlawPhotonFlux& model);
// Implemented pure virtual base class methods
virtual void clear(void);
virtual GModelSpectralPlawPhotonFlux* clone(void) const;
virtual std::string classname(void) const;
virtual std::string type(void) const;
virtual double eval(const GEnergy& srcEng,
const GTime& srcTime = GTime(),
const bool& gradients = false) const;
virtual double flux(const GEnergy& emin,
const GEnergy& emax) const;
virtual double eflux(const GEnergy& emin,
const GEnergy& emax) const;
virtual GEnergy mc(const GEnergy& emin,
const GEnergy& emax,
const GTime& time,
GRan& ran) const;
virtual void read(const GXmlElement& xml);
virtual void write(GXmlElement& xml) const;
virtual std::string print(const GChatter& chatter = NORMAL) const;
// Other methods
void type(const std::string& type);
double flux(void) const;
void flux(const double& flux);
double index(void) const;
void index(const double& index);
GEnergy emin(void) const;
void emin(const GEnergy& emin);
GEnergy emax(void) const;
void emax(const GEnergy& emax);
protected:
// Protected methods
void init_members(void);
void copy_members(const GModelSpectralPlawPhotonFlux& model);
void free_members(void);
void update(const GEnergy& srcEng) const;
// Protected members
std::string m_type; //!< Model type
GModelPar m_flux; //!< Photon flux (ph/cm2/s)
GModelPar m_index; //!< Spectral index
GModelPar m_emin; //!< Lower energy limit (MeV)
GModelPar m_emax; //!< Upper energy limit (MeV)
// Cached members used for pre-computations
mutable double m_log_emin; //!< Log(emin)
mutable double m_log_emax; //!< Log(emax)
mutable double m_pow_emin; //!< emin^(index+1)
mutable double m_pow_emax; //!< emax^(index+1)
mutable double m_norm; //!< Power-law normalization (for pivot energy 1 MeV)
mutable double m_g_norm; //!< Power-law normalization gradient
mutable double m_power; //!< Power-law factor
mutable double m_last_index; //!< Last spectral index (MeV)
mutable GEnergy m_last_emin; //!< Last lower energy limit
mutable GEnergy m_last_emax; //!< Last upper energy limit
mutable GEnergy m_last_energy; //!< Last source energy
};
/***********************************************************************//**
* @brief Return class name
*
* @return String containing the class name ("GModelSpectralPlawPhotonFlux").
***************************************************************************/
inline
std::string GModelSpectralPlawPhotonFlux::classname(void) const
{
return ("GModelSpectralPlawPhotonFlux");
}
/***********************************************************************//**
* @brief Return model type
*
* @return Model type.
*
* Returns the type of the spectral power law model.
***************************************************************************/
inline
std::string GModelSpectralPlawPhotonFlux::type(void) const
{
return (m_type);
}
/***********************************************************************//**
* @brief Set model type
*
* @param[in] type Model type.
*
* Set the type of the spectral power law model.
***************************************************************************/
inline
void GModelSpectralPlawPhotonFlux::type(const std::string& type)
{
m_type = type;
return;
}
/***********************************************************************//**
* @brief Return photon flux
*
* @return Photon flux (ph/cm2/s).
*
* Returns the photon flux.
***************************************************************************/
inline
double GModelSpectralPlawPhotonFlux::flux(void) const
{
return (m_flux.value());
}
/***********************************************************************//**
* @brief Set photon flux
*
* @param[in] flux Photon flux (ph/cm2/s).
*
* Sets the photon flux.
***************************************************************************/
inline
void GModelSpectralPlawPhotonFlux::flux(const double& flux)
{
m_flux.value(flux);
return;
}
/***********************************************************************//**
* @brief Return power law index
*
* @return Power law index.
*
* Returns the power law index.
***************************************************************************/
inline
double GModelSpectralPlawPhotonFlux::index(void) const
{
return (m_index.value());
}
/***********************************************************************//**
* @brief Set power law index
*
* @param[in] index Power law index.
*
* Sets the power law index.
***************************************************************************/
inline
void GModelSpectralPlawPhotonFlux::index(const double& index)
{
m_index.value(index);
return;
}
/***********************************************************************//**
* @brief Return minimum energy
*
* @return Minimum energy.
*
* Returns the minimum energy.
***************************************************************************/
inline
GEnergy GModelSpectralPlawPhotonFlux::emin(void) const
{
GEnergy energy;
energy.MeV(m_emin.value());
return energy;
}
/***********************************************************************//**
* @brief Set minimum energy
*
* @param[in] emin Minimum energy.
*
* Sets the minimum energy.
***************************************************************************/
inline
void GModelSpectralPlawPhotonFlux::emin(const GEnergy& emin)
{
m_emin.value(emin.MeV());
return;
}
/***********************************************************************//**
* @brief Return maximum energy
*
* @return Maximum energy.
*
* Returns the maximum energy.
***************************************************************************/
inline
GEnergy GModelSpectralPlawPhotonFlux::emax(void) const
{
GEnergy energy;
energy.MeV(m_emax.value());
return energy;
}
/***********************************************************************//**
* @brief Set maximum energy
*
* @param[in] emax Maximum energy.
*
* Sets the maximum energy.
***************************************************************************/
inline
void GModelSpectralPlawPhotonFlux::emax(const GEnergy& emax)
{
m_emax.value(emax.MeV());
return;
}
#endif /* GMODELSPECTRALPLAWPHOTONFLUX_HPP */