MG0414+0534 P-band Spectral Line Tutorial - CASA 5.0.0

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This CASA Guide is for Version 5.0.0 of CASA. THIS CASA GUIDE IS CURRENTLY IN PREPARATION (LAST ACTIVITY 18 AUG 2017)

Overview

This tutorial describes how to use CASA 5.0.0 to reduce spectral-line data in the low-frequency P-band of the VLA (230 – 470 MHz). The goal is to make an image cube containing HI 21cm absorption against the strong radio continuum of gravitationally lensed radio galaxy MG0414+0534. As a results of the high redshift of z=2.6365, the HI absorption signal in MG0414+0534 is redshifted to an observed frequency of 390.597 GHz. The HI absorption in MG0414+0534 was previously imaged with the VLA by Moore, Carilli & Menten 1999 (ApJ, 510, 87), before the upgrade to the WIDAR system.