create_arf

Context: data

Synopsis

Create an ARF.

Syntax

create_arf(elo, ehi, specresp=None, exposure=None, ethresh=None,
name='test-arf')

Description

Examples

Example 1

Create a flat ARF, with a value of 1.0 cm^2 for each bin, over the energy range 0.1 to 10 keV, with a bin spacing of 0.01 keV.

>>> egrid = np.arange(0.1, 10, 0.01)
>>> arf = create_arf(egrid[:-1], egrid[1:])

Example 2

Create an ARF that has 10 percent more area than the ARF from the default data set:

>>> arf1 = get_arf()
>>> elo = arf1.energ_lo
>>> ehi = arf1.energ_hi
>>> y = 1.1 * arf1.specresp
>>> arf2 = create_arf(elo, ehi, y, exposure=arf1.exposure)

PARAMETERS

The parameters for this function are:

Parameter	Type information	Definition
elo	numpy.ndarray	The energy bins (low and high, in keV) for the ARF. It is assumed that ehi_i > elo_i, elo_j > 0, the energy bins are either ascending - so elo_i+1 > elo_i - or descending (elo_i+1 < elo_i), and that there are no overlaps.
ehi	numpy.ndarray	The energy bins (low and high, in keV) for the ARF. It is assumed that ehi_i > elo_i, elo_j > 0, the energy bins are either ascending - so elo_i+1 > elo_i - or descending (elo_i+1 < elo_i), and that there are no overlaps.
specresp	None or array, optional	The spectral response (in cm^2) for the ARF. It is assumed to be >= 0. If not given a flat response of 1.0 is used.
exposure	number or None, optional	If not None, the exposure of the ARF in seconds.
ethresh	number or None, optional	Passed through to the DataARF call. It controls whether zero-energy bins are replaced.
name	str, optional	The name of the ARF data set

Changes in CIAO

Added in CIAO 4.11

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.