The codes and results in this repository are part of an ongoing study of the host galaxy of quasar 3C 297. The observations were obtained (Cycle 97 program 097.B-0452A; PI G. Tremblay) from the now-decomissioned SINFONI instrument at the ESO Very Large Telescope (VLT), Chile. The data are now in public domain and the raw files are available here.

The H-band (1.45−1.85 μm) data were reduced using the standard ESO-SINFONI pipeline. After sky subtraction and wavelength calibration, the final co-added data cube has a spatial scale of 0.125′′ per pix. The field of view is 8′′ × 8′′. The angular resolution is ∼0.4′′ as sampled by the point-spread function (PSF) from the standard star observations. At the target redshift, this translates to spatial resolution of ∼3 kpc.

The galaxy has a highly perturbed morphology, with a prominent arc towards north of the core. A quick look at the line profiles over the field of view (FOV) showed that the broad line emission is limited to the nuclear region-- which also shows blue-to-red shift roughly around the twin AGN (blue '+' marks). The northern arc-like feature only shows narrow line emission and bright UV emission in the HST-SINFONI overlay.

Thus, some of the analyses are divided spatially into the "nuclear" and "northern arc" regions.

• pipelined_FOV_fitting_&_maps | The main code-- automated spaxel-wise spectral modelling over a 30x34 mini-cube centered on the core. The line flux, velocity and velocity dispersion information is also recorded for each spaxel for 2D map construction.

The .py file shows the code at a glance, while the .ipynb file with the fitting outputs for 1020 spaxels is too large for Github to display.

• 3c297_broad&narrow_line_maps.ipynb | Creating line flux, velocity and velocity dispersion maps for all the detected lines in 3c297 spectrum (Halpha, [N II] and [S II]).
• spaxelwise_Nuclear7x7_NorthernArc.ipynb | This script does spaxel-wise line fitting on the nuclear 7x7 spaxel region and the northern arc. Each output shows the resulting fit values and plots the model+residuals on the observed spectrum.
• 3c297_overlays.ipynb | Multi-band overlays for comparing emission in the optical, UV, radio and line-emitting gas.
• WHAN_diagnostic_spaxelwise.ipynb | Script to perform WHAN emission-line diagnostics to find out the source of ionization of the narrow-line emitting gas.
• telluricOH_fitting.ipynb | Computing instrumental line broadening from telluric OH lines in the pre-background subtraction datacube.
• generate_error_cube.ipynb | This script creates an "error cube" form the noise in the observed data, for fittting uncertainty computations.
• 3x3central_leastsq_coupledfit.ipynb | A simple script that illustrates the 6-component Gaussian fitting used for spectral modelling in our analysis. Integrating the spectra of the central 3x3 spaxel region, the modelling shows a clear broad component in Halpha.