ALMA Tutorials: Difference between revisions
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== Introduction == | == Introduction == | ||
This page contains tutorials to guide ALMA users through some common types of data imaging and analysis using CASA with example ALMA datasets. | This page contains tutorials to guide ALMA users through some common types of data imaging and analysis using CASA with example ALMA datasets. Here are some links to get started: | ||
'''ALMA | '''ALMA''' | ||
* [http://almascience.org/ ALMA Science homepage] | * [http://almascience.org/ ALMA Science homepage] | ||
'''CASA''' | |||
* [http://casa.nrao.edu CASA homepage]: includes download and installation information | * [http://casa.nrao.edu CASA homepage]: includes download and installation information | ||
* {{casadocs_6.5.4}} | * {{casadocs_6.5.4}} | ||
* To cite CASA, please use: [https://ui.adsabs.harvard.edu/abs/2022PASP..134k4501C/abstract \bibitem<nowiki>[CASA Team et al.(2022)]</nowiki>{2022PASP..134k4501C} CASA Team, Bean, B., Bhatnagar, S., et al.\ 2022, PASP, 134, 114501. doi:10.1088/1538-3873/ac9642] | |||
* To cite the ALMA pipeline, please use: [https://ui.adsabs.harvard.edu/abs/2023PASP..135g4501H/abstract \bibitem<nowiki>[Hunter et al.(2023)]</nowiki>{2023PASP..135g4501H} Hunter, T.~R., Indebetouw, R., Brogan, C.~L., et al.\ 2023, PASP, 135, 074501. doi:10.1088/1538-3873/ace216] | |||
* [[Getting Started in CASA]] | * [[Getting Started in CASA]] | ||
* [[CASA Tips]] | * [[CASA Tips]] | ||
| Line 40: | Line 46: | ||
=== Considerations before Imaging === | === Considerations before Imaging === | ||
* [[ALMA Renormalization Correction]] | * [[ALMA Renormalization Correction]] | ||
:- | :- A fix for amplitude calibration issues caused by the ALMA normalization strategy for sources with strong line emission. | ||
* [[DataWeightsAndCombination]] | * [[DataWeightsAndCombination]] | ||
:- A guide to CASA data weights and how to ensure they are correct for data combination. | :- A guide to CASA data weights and how to ensure they are correct for data combination. | ||
| Line 51: | Line 57: | ||
=== Manual Imaging === | === Manual Imaging === | ||
* [[Guide NA | * [[Guide to the NA Imaging Template]] | ||
:- Create images with a manual template. | :- Create images with a manual template. | ||
* [[TCLEAN and ALMA]] | * [[TCLEAN and ALMA]] | ||
| Line 59: | Line 65: | ||
* [[Automasking Guide]] | * [[Automasking Guide]] | ||
:- | :- Explanation of parameters used in {{tclean_6.5.4}} to automatically mask clean regions during non-interactive cleaning. | ||
== Manual Calibration and Imaging == | == Manual Calibration and Imaging == | ||
| Line 65: | Line 71: | ||
These guides are useful tools for those who would like to learn the process of calibration and imaging in detail. They use publicly-available [https://almascience.nrao.edu/alma-data/science-verification 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. | These guides are useful tools for those who would like to learn the process of calibration and imaging in detail. They use publicly-available [https://almascience.nrao.edu/alma-data/science-verification 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. | ||
=== | === Mosaic Imaging === | ||
* [[AntennaeBand7]] | * [[AntennaeBand7]] | ||
:- Band 7 (0.87 mm) | :- Band 7 (345 GHz, 0.87 mm) | ||
:- CO 3-2 spectral line | |||
:- Antennae Galaxy Merger (NGC 4038/4039) | :- Antennae Galaxy Merger (NGC 4038/4039) | ||
:- North and South mosaics | :- North and South mosaics | ||
=== High Frequency | === High Frequency Calibration === | ||
* [[IRAS16293Band9]] | * [[IRAS16293Band9]] | ||
:- Band 9 (0. | :- Band 9 (650 GHz, 0.46 mm) | ||
:- Protostellar Cluster | :- Protostellar Cluster | ||
:- High frequency techniques | :- High frequency techniques | ||
:- Mosaic | :- Mosaic | ||
=== Single Dish and Array Combination === | === Single Dish and Array Image Combination === | ||
* [[M100_Band3]] | * [[M100_Band3]] | ||
:- Band 3 ( | :- Band 3 (100 GHz, 3 mm) | ||
:- Total Power (Single Dish) calibration and imaging | :- Total Power (Single Dish) calibration and imaging | ||
:- Combining 12m-array, 7m-array, and Total Power data | :- Combining 12m-array, 7m-array, and Total Power data | ||
| Line 90: | Line 97: | ||
* [[3C286_Polarization]] | * [[3C286_Polarization]] | ||
:- Band 6 ( | :- Band 6 (230 GHz, 1.3 mm) | ||
:- Continuum polarization | :- Continuum polarization | ||
| Line 96: | Line 103: | ||
* [[Sunspot_Band6]] | * [[Sunspot_Band6]] | ||
:- Band 6 (1. | :- Band 6 (230 GHz, 1.3 mm) | ||
:- Solar observing techniques | :- Solar observing techniques | ||
:- Calibration and imaging | :- Calibration and imaging | ||
| Line 130: | Line 137: | ||
* [https://almascience.nrao.edu/processing/science-pipeline ALMA Pipeline webpage] | * [https://almascience.nrao.edu/processing/science-pipeline ALMA Pipeline webpage] | ||
* To cite the ALMA pipeline, please use: [https://ui.adsabs.harvard.edu/abs/2023PASP..135g4501H/abstract \bibitem<nowiki>[Hunter et al.(2023)]</nowiki>{2023PASP..135g4501H} Hunter, T.~R., Indebetouw, R., Brogan, C.~L., et al.\ 2023, PASP, 135, 074501. doi:10.1088/1538-3873/ace216] | |||
* [[ALMA Pipeline Known Issues]] | * [[ALMA Pipeline Known Issues]] | ||
| Line 137: | Line 145: | ||
* [[ADMIT Products and Usage]]: This guide discusses how to use the ALMA Data-Mining Toolkit (ADMIT) and customize it for your data. | * [[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. | * [[Analysis Utilities]]: A Python module containing utilities for analysis and plotting. | ||
=== Other Telescopes === | === Other Telescopes === | ||
| Line 144: | Line 151: | ||
* [[Past MM/Submm Guides]]: These are not currently being maintained. | * [[Past MM/Submm Guides]]: These are not currently being maintained. | ||
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Latest revision as of 20:27, 10 September 2024
Introduction
This page contains tutorials to guide ALMA users through some common types of data imaging and analysis using CASA with example ALMA datasets. Here are some links to get started:
ALMA
CASA
- CASA homepage: includes download and installation information
- CASA Docs
* To cite CASA, please use: \bibitem[CASA Team et al.(2022)]{2022PASP..134k4501C} CASA Team, Bean, B., Bhatnagar, S., et al.\ 2022, PASP, 134, 114501. doi:10.1088/1538-3873/ac9642 * To cite the ALMA pipeline, please use: \bibitem[Hunter et al.(2023)]{2023PASP..135g4501H} Hunter, T.~R., Indebetouw, R., Brogan, C.~L., et al.\ 2023, PASP, 135, 074501. doi:10.1088/1538-3873/ace216
- 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 fix for amplitude calibration issues caused by the ALMA normalization strategy for sources with strong line emission.
- - 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
- - Explanation of parameters used in tclean to automatically mask clean regions during non-interactive cleaning.
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.
Mosaic Imaging
- - Band 7 (345 GHz, 0.87 mm)
- - CO 3-2 spectral line
- - Antennae Galaxy Merger (NGC 4038/4039)
- - North and South mosaics
High Frequency Calibration
- - Band 9 (650 GHz, 0.46 mm)
- - Protostellar Cluster
- - High frequency techniques
- - Mosaic
Single Dish and Array Image Combination
- - Band 3 (100 GHz, 3 mm)
- - Total Power (Single Dish) calibration and imaging
- - Combining 12m-array, 7m-array, and Total Power data
Full Polarization
- - Band 6 (230 GHz, 1.3 mm)
- - Continuum polarization
Solar Observing
- - Band 6 (230 GHz, 1.3 mm)
- - 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
* To cite the ALMA pipeline, please use: \bibitem[Hunter et al.(2023)]{2023PASP..135g4501H} Hunter, T.~R., Indebetouw, R., Brogan, C.~L., et al.\ 2023, PASP, 135, 074501. doi:10.1088/1538-3873/ace216
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.
Other Telescopes
- Karl G. Jansky VLA Tutorials
- Past MM/Submm Guides: These are not currently being maintained.
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