def generate_energies(self, t_exp, fov, prng=None,
quiet=False):
"""
Generate photon energies from this convolved
background spectrum given an exposure time and
field of view.
Parameters
----------
t_exp : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The exposure time in seconds.
fov : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The width of the field of view on a side
in arcminutes.
prng : :class:`~numpy.random.RandomState` object, integer, or None
A pseudo-random number generator. Typically will only
be specified if you have a reason to generate the same
set of random numbers, such as for a test. Default is None,
which sets the seed based on the system time.
quiet : boolean, optional
If True, log messages will not be displayed when
creating energies. Useful if you have to loop over
a lot of spectra. Default: False
"""
t_exp = parse_value(t_exp, "s")
fov = parse_value(fov, "arcmin")
prng = parse_prng(prng)
rate = fov*fov*self.total_flux.value
energy = _generate_energies(self, t_exp, rate, prng, quiet=quiet)
earea = self.arf.interpolate_area(energy).value
flux = np.sum(energy)*erg_per_keV/t_exp/earea.sum()
energies = Energies(energy, flux)
return energies
def generate_energies(self, t_exp, fov, prng=None,
quiet=False):
"""
Generate photon energies from this convolved
background spectrum given an exposure time and
field of view.
Parameters
----------
t_exp : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The exposure time in seconds.
fov : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The width of the field of view on a side
in arcminutes.
prng : :class:`~numpy.random.RandomState` object, integer, or None
A pseudo-random number generator. Typically will only
be specified if you have a reason to generate the same
set of random numbers, such as for a test. Default is None,
which sets the seed based on the system time.
quiet : boolean, optional
If True, log messages will not be displayed when
creating energies. Useful if you have to loop over
a lot of spectra. Default: False
"""
t_exp = parse_value(t_exp, "s")
fov = parse_value(fov, "arcmin")
prng = parse_prng(prng)
rate = fov*fov*self.total_flux.value
energy = _generate_energies(self, t_exp, rate, prng, quiet=quiet)
earea = self.arf.interpolate_area(energy).value
flux = np.sum(energy)*erg_per_keV/t_exp/earea.sum()
energies = Energies(energy, flux)
return energies
def generate_energies(self, t_exp, area, fov, prng=None,
quiet=False):
"""
Generate photon energies from this background
spectrum given an exposure time, effective area,
and field of view.
Parameters
----------
t_exp : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The exposure time in seconds.
area : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The effective area in cm**2. If one is creating
events for a SIMPUT file, a constant should be
used and it must be large enough so that a
sufficiently large sample is drawn for the ARF.
fov : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The width of the field of view on a side in
arcminutes.
prng : :class:`~numpy.random.RandomState` object, integer, or None
A pseudo-random number generator. Typically will only
be specified if you have a reason to generate the same
set of random numbers, such as for a test. Default is None,
which sets the seed based on the system time.
quiet : boolean, optional
If True, log messages will not be displayed when
creating energies. Useful if you have to loop over
a lot of spectra. Default: False
"""
t_exp = parse_value(t_exp, "s")
fov = parse_value(fov, "arcmin")
area = parse_value(area, "cm**2")
prng = parse_prng(prng)
rate = area*fov*fov*self.total_flux.value
energy = _generate_energies(self, t_exp, rate, prng, quiet=quiet)
flux = np.sum(energy)*erg_per_keV/t_exp/area
energies = Energies(energy, flux)
return energies
def generate_energies(self, t_exp, area, fov, prng=None,
quiet=False):
"""
Generate photon energies from this background
spectrum given an exposure time, effective area,
and field of view.
Parameters
----------
t_exp : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The exposure time in seconds.
area : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The effective area in cm**2. If one is creating
events for a SIMPUT file, a constant should be
used and it must be large enough so that a
sufficiently large sample is drawn for the ARF.
fov : float, (value, unit) tuple, or :class:`~astropy.units.Quantity`
The width of the field of view on a side in
arcminutes.
prng : :class:`~numpy.random.RandomState` object, integer, or None
A pseudo-random number generator. Typically will only
be specified if you have a reason to generate the same
set of random numbers, such as for a test. Default is None,
which sets the seed based on the system time.
quiet : boolean, optional
If True, log messages will not be displayed when
creating energies. Useful if you have to loop over
a lot of spectra. Default: False
"""
t_exp = parse_value(t_exp, "s")
fov = parse_value(fov, "arcmin")
area = parse_value(area, "cm**2")
prng = parse_prng(prng)
rate = area*fov*fov*self.total_flux.value
energy = _generate_energies(self, t_exp, rate, prng, quiet=quiet)
flux = np.sum(energy)*erg_per_keV/t_exp/area
energies = Energies(energy, flux)
return energies