chetnaduggal / css-galaxies-hst

Analyzing Hubble Space Telescope optical/UV continuum imaging of compact radio galaxies

A Hubble view of Compact Steep-Spectrum (CSS) host galaxies

Reduction and mapping of HST/WFC3 optical/UV continuum data for a sample of compact, young radio galaxies (Cycle 25 GO program 15245; PI: C. O’Dea). 7 of these are CSS galaxies hosting kpc-scale steep-spectrum radio source.

The codes include:

• Post-pipeline processing of HST images with the Drizzlepac software.
• Mapping continuum emission in the three bands (optical, UV and radio) by reprojecting the images onto a new, optimum WCS grid to create multi-wavelength overlays.
• The results of surface brightness analysis with IRAF/ellipse isophote fitting & 2D morphological decomposition with GALFIT. The galaxy fit profiles for the latter are generated using the Ellipsect code.
• Comparison of major-axis Position Angles of the observed galaxy/radio-source structure in the optical, near-UV and radio bands.
• Galactic and internal extinction corrections using E(B−V) color excess sourced from the NASA/IPAC archive.
• Plotting photometric spectral energy ditributions (SEDs) for the 9 compact radio galaxies.

All the scripts in this repository are associated with a new study of AGN feedback in CSS host galaxies, recently submitted to ApJ.

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