ALMA Tutorials draft: Difference between revisions

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Revision as of 22:57, 14 November 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:

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
File:Pipeline logo.png
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

Basic Imaging and Analysis

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)

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File:TWHya.png
First Look at Self Calibration description
First Look at Line Imaging description
First Look at Image Analysis description

Older versions of these guides are archived here: ALMA First Look

Advanced Imaging

Modified Pipeline Imaging

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NA Manual Imaging Templates This guide describes the template scripts used to manually image data for quality assurance by the North America ALMA Science Center (NAASC).
Automasking This guide describes how to automatically mask clean regions during non-interactive cleaning.
Jump to special imaging topics from the End to End guides:

End to End Guides (Manual Calibration)

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.

AntennaeBand7
  • Band 7 (345 GHz, 0.87 mm)
  • CO 3-2 spectral line
  • Antennae Galaxy Merger (NGC 4038/4039)
  • North and South mosaics
IRAS16293Band9

Discusses full calibration of 12m interferometry Band 9 (high frequency, 650 GHz, 0.46 mm) data of a protostellar cluster, including inspection of the data for flagging, and plotms commands to recreate plots typically included in a QA2 weblog. Also discusses imaging of mosaic data, including self-calibration and generation of image cubes and moment maps.

M100 Band3

Band 3 (100 GHz, 3 mm) on M100 demonstrates Single Dish (Total Power) data reduction and 12m, 7m, Total Power data combination procedures.

3C286 Polarization

Standard calibrations and polarization calibration (XX, XY, YX, YY) of 3c286 in Band 6 (230 GHz, 1.3 mm), a quasar frequently used as a flux calibrator source. Full Stokes imaging (IQUV), self-calibration, and analysis of polarization intensity and polarization angle using both CARTA and numerical methods.

Sunspot Band6
  • Band 6 (230 GHz, 1.3 mm)
  • Solar observing techniques
  • Calibration and imaging
  • Helper scripts

Special Topics

- relevant for data from Cycles 0, 1, and 2
- Also see: Guide To Simulating ALMA Data

Legacy Guides

- 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