WorkshopSelfcal

This page describes the hands-on self calibration portion of the ALMA data reduction workshop. In this session you will carry out self-calibration on ALMA Science Verification data to improve the image quality. This page describes the data and introduces the scripts. It is not a full-fledged CASA guide, only background for the hands on portion of the workshop. For the imaging session in the morning go here: WorkshopImaging

Overview

Data Description

You will use the now-familiar NGC 3256 Band 3 or TW Hydra Band 7 Science Verification data. You have seen these already this morning. Both contain several lines, including CO emission, and continuum emission. We will begin by imaging the continuum emission and using that to self calibrate. We will then see how to apply that self-calibration to improve the line images.

Note that it is perfectly possible to self-calibrate the other TW Hydra data or the Antennae Band 7 data (see AntennaeBand7). If you finish quickly, you might try to write your own script to do this.

Continuum Self Calibration

File:Basic selfcal.py

Continuum-to-Line Self Calibration

Self-calibration can also be used to improve your spectral line imaging.