ALMA Tutorials
Introduction
This page contains tutorials to guide ALMA users through some common types of data imaging and analysis using CASA with example ALMA datasets.
ALMA and CASA links to get started:
- ALMA Science homepage
- CASA homepage: includes download and installation information
- CASA Docs
- Getting Started in CASA
- CASA Tips
- CASA Hints, Tips & Tricks
- How To Use A CASAGuide
- Extracting scripts from these tutorials
CARTA
Guides that have been updated to demonstrate the CARTA image viewer will include this statement near the top:
This guide features CARTA, the “Cube Analysis and Rendering Tool for Astronomy,” which is the new NRAO visualization tool for images and cubes. The CASA viewer (imview) has not been maintained for a few years and will be removed from future versions of CASA. We strongly recommend using CARTA, as it provides a much more efficient, stable, and feature rich user experience. A comparison of the CASA viewer and CARTA, as well as instructions on how to use CARTA at NRAO, is provided in the CARTA section of the CASA docs.
First Look (TW Hydra)
ALMA data are delivered to users with calibrations applied and they are ready for imaging. The following "First Look" tutorials provide short examples of common next steps a user may take with their calibrated data. These guides use an example ALMA observation of TW Hydra.
Older versions of these guides are archived here: ALMA First Look
Restoring and Imaging Calibrated Data
Considerations before Imaging
- -
- - A guide to CASA data weights and how to ensure they are correct for data combination.
Pipeline Imaging
- - Create images using pipeline tasks.
Manual Imaging
- - Create images with a manual template.
- - Examples of using tclean, with emphasis on changes from the older "clean" task.
Automasking
- -
Manual Calibration and Imaging
These guides are useful tools for those who would like to learn the process of calibration and imaging in detail. They use publicly-available ALMA Science Verification data that illustrate several different ALMA capabilities. The links below lead to overview pages for each observation. The guides themselves are linked from the overview pages.
Band 7 Mosaic
- - Band 7 (0.87 mm)
- - Antennae Galaxy Merger (NGC 4038/4039)
- - North and South mosaics
High Frequency
- - Band 9 (0.45 mm)
- - Protostellar Cluster
- - High frequency techniques
- - Mosaic
Single Dish and Array Combination
- - Band 3 (115.271 GHz)
- - Total Power (Single Dish) calibration and imaging
- - Combining 12m-array, 7m-array, and Total Power data
Full Polarization
- - Band 6 (233 GHz, 1 mm)
- - Continuum polarization
Solar Observing
- - Band 6 (1.25mm)
- - Solar observing techniques
- - Calibration and imaging
- - Helper scripts
Simulation
- - An overview of simulation as it pertains to ALMA.
- - All simulation guides (for ALMA, VLA, ngVLA, etc.)
Legacy Guides
These guides and scripts use Science Verification data and have been validated for older versions of CASA, but will not continue to be updated for new CASA releases:
Cycle 0
- - Last checked in CASA 4.2
- - Helpful hints for downloading the data
- - Imaging, self-calibration, and image analysis
Example data calibration scripts used for Cycle 0 data (CASA 3.4):
- File:TDM.example.ms.scriptForCalibration.py: TDM (128 channels/spw)
- File:FDM.example.ms.scriptForCalibration.py: FDM (3840 channels/spw)
- Updating a script to work with CASA 4.2: Update 3.4 scripts to 4.2 or later.
Resources
Pipeline
Tools
- ALMA Sensitivity Calculator
- ADMIT Products and Usage: This guide discusses how to use the ALMA Data-Mining Toolkit (ADMIT) and customize it for your data.
- Analysis Utilities: A Python module containing utilities for analysis and plotting.
- Solar System Models in CASA 4.0
Other Telescopes
- Karl G. Jansky VLA Tutorials
- Past MM/Submm Guides: These are not currently being maintained.
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