aXeConf

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

Bases: object

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()

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

Parameters:

dxarray-like

x pixel to evaluate

dydxarray-like

Coefficients of the trace polynomial

Returns:

dparray-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)

aXe field-dependent coefficients

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

Parameters:

xi, yifloat or array-like

Coordinate to evaluate the field dependent coefficients, where xi = x-REFX and yi = y-REFY.

coeffsarray-like

Field-dependency coefficients

Returns:

afloat or array-like

Evaluated field-dependent coefficients

get_beam_trace(x=507, y=507, dx=0.0, beam='A', fwcpos=None)

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

Parameters:

x, yfloat or array-like

Evaluate trace definition at detector coordinates x and y.

dxfloat or array-like

Offset in x pixels from (x,y) where to compute trace offset and effective wavelength

beamstr

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.

fwcposNone or float

For NIRISS, specify the filter wheel position to compute the trace rotation

Returns:

dyfloat or array-like

Center of the trace in y pixels offset from (x,y) evaluated at dx.

lamfloat or array-like

Effective wavelength along the trace evaluated at dx.

get_beams()

Get beam parameters and read sensitivity curves

read_conf_file(conf_file='WFC3.IR.G141.V2.5.conf')

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'])

Make a demo plot of the beams of a given configuration file