aXeConf¶

class grizli.grismconf.aXeConf(conf_file='WFC3.IR.G141.V2.5.conf')[source]¶

Read an aXe-compatible configuration file

Parameters:	conf_file: str Filename of the configuration file to read

Methods Summary

`count_beam_orders`()	Get the maximum polynomial order in DYDX or DLDP for each beam
`evaluate_dp`(dx, dydx)	Evalate arc length along the trace given trace polynomial coefficients
`field_dependent`(xi, yi, coeffs)	aXe field-dependent coefficients
`get_beam_trace`([x, y, dx, beam, fwcpos])	Get an aXe beam trace for an input reference pixel and list of output x pixels `dx`
`get_beams`()	Get beam parameters and read sensitivity curves
`read_conf_file`([conf_file])	Read an aXe config file, convert floats and arrays
`show_beams`([xy, beams])	Make a demo plot of the beams of a given configuration file

Methods Documentation

count_beam_orders()[source]¶: Get the maximum polynomial order in DYDX or DLDP for each beam

evaluate_dp(dx, dydx)[source]¶

Evalate arc length along the trace given trace polynomial coefficients

Parameters:

Returns:

dp : array-like: Arc length along the trace at position dx.
For dydx polynomial orders 0, 1 or 2, integrate analytically.
Higher orders must be integrated numerically.
Constant:: \[dp = dx\]
Linear:: \[dp = \sqrt{1+\mathrm{DYDX}[1]}\cdot dx\]
Quadratic:: \[u = \mathrm{DYDX}[1] + 2\ \mathrm{DYDX}[2]\cdot dx\]

\[dp = (u \sqrt{1+u^2} + \mathrm{arcsinh}\ u) / (4\cdot \mathrm{DYDX}[2])\]

field_dependent(xi, yi, coeffs)[source]¶

aXe field-dependent coefficients

See the aXe manual for a description of how the field-dependent coefficients are specified.

Parameters:	xi, yi : float or array-like Coordinate to evaluate the field dependent coefficients, where `xi = x-REFX` and `yi = y-REFY`. coeffs : array-like Field-dependency coefficients
Returns:	a : float or array-like Evaluated field-dependent coefficients

get_beam_trace(x=507, y=507, dx=0.0, beam='A', fwcpos=None)[source]¶

Get an aXe beam trace for an input reference pixel and list of output x pixels dx

Parameters:

x, y : float or array-like: Evaluate trace definition at detector coordinates x and y.
dx : float or array-like: Offset in x pixels from (x,y) where to compute trace offset and effective wavelength
beam : str: Beam name (i.e., spectral order) to compute. By aXe convention, beam='A' is the first order, ‘B’ is the zeroth order and additional beams are the higher positive and negative orders.
fwcpos : None or float: For NIRISS, specify the filter wheel position to compute the trace rotation

Returns:

dy : float or array-like: Center of the trace in y pixels offset from (x,y) evaluated at dx.
lam : float or array-like: Effective wavelength along the trace evaluated at dx.

read_conf_file(conf_file='WFC3.IR.G141.V2.5.conf')[source]¶

Read an aXe config file, convert floats and arrays

Parameters:	conf_file: str Filename of the configuration file to read. Parameters are stored in an OrderedDict in `self.conf`.

show_beams(xy=None, beams=['E', 'D', 'C', 'B', 'A'])[source]¶: Make a demo plot of the beams of a given configuration file