Updated Configuration files for JWST NIRISS Slitless Spectroscopy
Creators: name: Matharu, Jasleen
name: Brammer, Gabriel
Publisher: name: Zenodo
Year: 2022
Subjects: astronomy
jwst

description: We share the following new configuration files and sensitivity curves for the 1st order spectra for JWST NIRISS Slitless Spectroscopy: F115W + GR150C F115W + GR150R F150W + GR150C F150W + GR150R F200W + GR150C F200W + GR150R We use JWST comissioning data from program 1085, the NIRISS-FOCUS-FIELD, which are observations of the outer LMC. We optimise Grizli model fits to the grism spectra of stars in individual exposures with MAG_AUTO &lt; 21.5 and 1 &lt; FLUX_RADIUS &lt; 2 that have the positions x_flt and y_flt in the associated direct image (in the rotated Grizli dispersed frame). In each case, we get best fits to DYDX_A_0 (trace centre in y) and DLDP_A_0 (wavelength zeropoint in x). These parameters are measured in the Grizli convention where all spectra have been rotated to have the dispersion roughly parallel to array rows and with wavelength increasing "toward the right". Only those fits with a chi-squared &lt; 50000 are used. The field dependence of these parameters across the detector are fit with a low-order 2D Polynomial model with astropy.modeling.models.Polynomial2D. Degree = 2 is used for the more sparsely sampled F200W and degree = 3 is used for the the bluer filters that better fill the detector frame. These fits are then iterated to remove outliers. New coefficients for DYDX_{}_0 and DLDP_{}_0 are calculated and provided in the configuration files in this release. PNG files show the field dependence for each parameter in each filter + grism combination. <strong>List of files available in the config tar file (configuration files)</strong> GR150C.F115W.221215.conf GR150C.F150W.221215.conf GR150C.F200W.221215.conf GR150R.F115W.221215.conf GR150R.F150W.221215.conf GR150R.F200W.221215.conf f115w_gr150c_dldp_a_0.png f115w_gr150c_dydx_a_0.png f115w_gr150r_dldp_a_0.png f115w_gr150r_dydx_a_0.png f150w_gr150c_dldp_a_0.png f150w_gr150c_dydx_a_0.png f150w_gr150r_dldp_a_0.png f150w_gr150r_dydx_a_0.png f200w_gr150c_dldp_a_0.png f200w_gr150c_dydx_a_0.png f200w_gr150r_dldp_a_0.png f200w_gr150r_dydx_a_0.png <strong>List of files available in the sens tar file (sensitivity curves)</strong> NIRISS.GR150C.F115W.wd1657.p1.sens.fits NIRISS.GR150C.F150W.wd1657.p1.sens.fits NIRISS.GR150C.F200W.wd1657.p1.sens.fits NIRISS.GR150R.F115W.wd1657.p1.sens.fits NIRISS.GR150R.F150W.wd1657.p1.sens.fits NIRISS.GR150R.F200W.wd1657.p1.sens.fits <strong>Installation</strong> Download both tar files into the CONF directory of your Grizli installation and unpack. An example of how to do this in python is shown below. <pre><code>import os import grizli os.chdir(os.path.join(grizli.GRIZLI_PATH, 'CONF')) if not os.path.exists('GR150C.F115W.221215.conf'): os.system('wget "https://zenodo.org/record/7628094/files/niriss_config_221215.tar.gz?download=1" -O niriss_config_221215.tar.gz') os.system('tar xzvf niriss_config_221215.tar.gz') if not os.path.exists('niriss_sens_221215.tar.gz'): os.system('wget "https://zenodo.org/record/7628094/files/niriss_sens_221215.tar.gz" -O niriss_sens_221215.tar.gz') os.system('tar xzvf niriss_sens_221215.tar.gz')</code></pre>