ALMA Tutorials: Difference between revisions

From CASA Guides
Jump to navigationJump to search
← Older edit
mNo edit summary
 
(47 intermediate revisions by 2 users not shown)
Line 1: Line 1:
== 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'''
* [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 11: Line 19:
* [[Extracting scripts from these tutorials]]
* [[Extracting scripts from these tutorials]]


== Imaging ==
'''CARTA'''
 
Guides that have been updated to demonstrate the CARTA image viewer will include this statement near the top:
{{CARTA_6.5.4}}


=== First Look ===
== 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 Hya.
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.


* [[First_Look_at_Imaging | Continuum Imaging]]
* [[First_Look_at_Imaging | Continuum Imaging]]
Line 22: Line 33:
* [[First_Look_at_Image_Analysis | Moments and Image Analysis]]
* [[First_Look_at_Image_Analysis | Moments and Image Analysis]]


Older versions of these guides are archived here: [[ALMA_First_Look]]
Older versions of these guides are archived here: [[ALMA First Look]]
<!--
<!--
Community Day Tutorials:
Community Day Tutorials:
Line 31: Line 42:
-->
-->


=== Topical Guides ===
== Restoring and Imaging Calibrated Data ==
 
=== Considerations before Imaging ===
* [[ALMA Renormalization Correction]]
:- A fix for amplitude calibration issues caused by the ALMA normalization strategy for sources with strong line emission.
* [[DataWeightsAndCombination]]
:- A guide to CASA data weights and how to ensure they are correct for data combination.
 
=== Pipeline Imaging ===
 
* [[ALMA Imaging Pipeline Reprocessing]]
:- Create images using pipeline tasks.


* [[ALMA Imaging Pipeline Reprocessing]]: Create images using pipeline tasks.
=== Manual Imaging ===
* [[Guide NA ImagingTemplate]]: Create images with a manual template.
 
* [[TCLEAN and ALMA]]: Examples of using {{tclean_6.5.4}}, with emphasis on changes from the older "clean" task.
* [[Guide to the NA Imaging Template]]
* [[Automasking Guide]]
:- Create images with a manual template.
* [[TCLEAN and ALMA]]
:- Examples of using {{tclean_6.5.4}}, with emphasis on changes from the older "clean" task.


'''CARTA'''
=== Automasking ===


Guides that have been updated to demonstrate the CARTA image viewer will include this statement near the top:
* [[Automasking Guide]]
{{CARTA_6.5.4}}
:- 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 47: 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 (Band 7) ===
=== Mosaic Imaging ===


* [[AntennaeBand7]]: Mosaic of the galaxy merger NGC 4038/4039 (Antennae) at Band 7 (0.87 mm). Validated for CASA 6.5.4.
* [[AntennaeBand7]]
:- Band 7 (345 GHz, 0.87 mm)
:- CO 3-2 spectral line
:- Antennae Galaxy Merger (NGC 4038/4039)
:- North and South mosaics


=== Mosaic (Band 9) ===
=== High Frequency Calibration ===


* [[IRAS16293Band9]]: Mosaic of the protostellar cluster IRAS16293-2422 at Band 9 (0.45 mm). Validated for CASA 6.5.4.
* [[IRAS16293Band9]]
:- Band 9 (650 GHz, 0.46 mm)
:- Protostellar Cluster
:- High frequency techniques
:- Mosaic


=== Total Power (Single Dish) and Array Combination ===
=== Single Dish and Array Image Combination ===


* [[M100_Band3]]: Demonstration of combining 12m-array, 7m-array, and Total Power data for M100. Validated for CASA 6.5.4.
* [[M100_Band3]]
:- Band 3 (100 GHz, 3 mm)
:- Total Power (Single Dish) calibration and imaging
:- Combining 12m-array, 7m-array, and Total Power data


=== Full Polarization ===
=== Full Polarization ===


* [[3C286_Polarization]]: Demonstration of the reduction of ALMA continuum polarization toward the quasar 3C286. Validated for CASA 6.5.4.
* [[3C286_Polarization]]
:- Band 6 (230 GHz, 1.3 mm)
:- Continuum polarization


=== Solar Observing ===
=== Solar Observing ===


* [[Sunspot_Band6]]: Demonstration of the reduction and imaging of solar data at Band 6 (1.25mm). Validated for CASA 6.5.4.
* [[Sunspot_Band6]]
:- Band 6 (230 GHz, 1.3 mm)
:- Solar observing techniques
:- Calibration and imaging
:- Helper scripts
 
== Simulation ==
 
* [[Guide To Simulating ALMA Data]]
:- An overview of simulation as it pertains to ALMA.
* [[Simulating Observations in CASA]]
:- All simulation guides (for ALMA, VLA, ngVLA, etc.)
 
== Legacy Guides ==


== Resources ==
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:
* [[Archived ALMA CASAguides]]


* [http://almascience.org/ ALMA Science homepage]
=== Cycle 0 ===
* [https://almascience.nrao.edu/about-alma/proposing/sensitivity-calculator ALMA Sensitivity Calculator]
* [[ALMA Renormalization Correction]]


=== Simulation ===
* [[Guide To Processing ALMA Data for Cycle 0]]
:- Last checked in CASA 4.2
:- Helpful hints for downloading the data
:- Imaging, self-calibration, and image analysis


[[Guide To Simulating ALMA Data]]: An overview of simulation as it pertains to ALMA.
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.


[[Simulating Observations in CASA]]: Several guides.
== Resources ==


=== Pipeline ===
=== Pipeline ===


* [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]]


=== Tools ===
=== Tools ===


* [[DataWeightsAndCombination | A Guide to CASA Data Weights and How to Ensure They are Correct for Data Combination]]
* [https://almascience.nrao.edu/about-alma/proposing/sensitivity-calculator ALMA Sensitivity Calculator]
* [[TCLEAN_and_ALMA | Examples for using the new tclean CASA task for ALMA Imaging]]
* [[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.  
* [[Solar System Models in CASA 4.0 | Solar System Models in CASA 4.0]] and beyond
* Tutorials related to ALMA Solar Science Verification Data: [http://almascience.org/alma-data/science-verification/tutorial-alma-solar-science-verification-data CASA 4.7]
* [[ADMIT_Products_and_Usage | A guide for utilizing ADMIT for your data]]: This guide discusses how to use ADMIT and customize it for your data.


=== Legacy Guides ===
=== Other Telescopes ===


[[Archived_ALMA_CASAguides]]
* [[Karl G. Jansky VLA Tutorials]]
 
* [[Past MM/Submm Guides]]: These are not currently being maintained.
''The following ALMA science verification guides and scripts have been validated for older versions of CASA, and will not continue to be updated for new CASA releases. ''
 
* [[TWHydraBand7 | TWHydraBand7]]: The protoplanetary disk source TW Hya at Band 7 (0.87 mm). Last validated for CASA 4.3.
* [[NGC3256Band3 | NGC3256Band3]]: The galaxy merger NGC 3256 at Band 3 (3 mm). Last validated for CASA 4.3.  
* [[ALMA2014_LBC_SVDATA]]: Imaging scripts and details for the 2014 ALMA Long Baseline Campaign science verification data for Juno, Mira, HL Tau, and SDP.81. Last validated for CASA 4.2.2.
* [[File:BR1202_SV_Band7_Calibration_notes.pdf | BR1202_SV_Band7_Calibration_notes]]: Supplemental notes on the calibration of Science Verification target BR1202-0725 in CASA 3.3.  


<!--
<!--
** [[M100_Band3]]
[[ALMAguides_old_homepage]]
** [[M100_Band3_SingleDish_4.3]]
** [[M100_Band3_Combine_4.3]]
**[[3C286_Polarization]]
**[[3C286_Polarization_Calibration_4.2.2]]
**[[3C286_Polarization_Imaging_4.2.2]]
[[Automasking_Guide]]
-->
-->
=== Cycle 0 ===
[[Guide_To_Processing_ALMA_Data_for_Cycle_0 | A Guide to Processing ALMA Data for Cycle 0]] (last checked in CASA 4.2) takes you through the steps of processing Cycle 0 data from the ALMA data archive.  The guide describes some helpful hints for downloading the data, and describes the process all the way through imaging and self-calibration, and image analysis.
You can also get a look at example data calibration scripts used for Cycle 0 data at the following links.  These were written for CASA version 3.4.
* TDM (128 channels/spw) [[File:TDM.example.ms.scriptForCalibration.py]]
* FDM (3840 channels/spw) [[File:FDM.example.ms.scriptForCalibration.py]]
* If you need to update 3.4 scripts to 4.2 or later, see more information [[Updating_a_script_to_work_with_CASA_4.2|here]]
=== Other Telescopes ===
* [[Karl G. Jansky VLA Tutorials]]
* [[Past_MM/Submm_Guides]]: These are not currently being maintained.


{| style="width: 100%; valign: top; background-color:#CCFFFF; border:1px solid #3366FF;" cellpadding=1  
{| style="width: 100%; valign: top; background-color:#CCFFFF; border:1px solid #3366FF;" cellpadding=1  

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 

  * 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

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):

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

Other Telescopes
Retrieved from "https://casaguides.nrao.edu/index.php?title=ALMA_Tutorials&oldid=37560"