Karl G. Jansky VLA Tutorials: Difference between revisions

From CASA Guides
Jump to navigationJump to search
Line 61: Line 61:

* '''Protostar G192.16-3.84: Wide-band, narrow-field imaging using 3-bit sampled data; Ka-band''' (CASA 4.1)
* '''Protostar G192.16-3.84: Wide-band, narrow-field imaging using 3-bit sampled data; Ka-band (27-38 GHz)''' (CASA 4.1)
* [http://casaguides.nrao.edu/index.php?title=EVLA_3-bit_Tutorial_G192 Protostar G192.16-3.84 Tutorial]
* [http://casaguides.nrao.edu/index.php?title=EVLA_3-bit_Tutorial_G192 Protostar G192.16-3.84 Tutorial]

Revision as of 19:01, 30 July 2013


The EVLA Tutorials are meant to guide the observer through some common types of data analysis, using example datasets, and including explanations of the individual steps. These analyses will be broadly applicable to many EVLA datasets.

If you are new to EVLA Data, you may start with

Getting Started with EVLA data

EVLA Tutorials

  • Carbon Star IRC+10216: high frequency (36GHz), spectral line data reduction (CASA 4.1)

Calibrate and make image cubes of the line emission from this asymptotic giant branch star. This is a high-frequency EVLA dataset. Includes:

  • Inspecting data; basic flagging & calibration
  • Subtracting continuum emission
  • Imaging the spectral lines
  • Imaging the continuum
  • Image analysis
  • Self-calibration

  • Supernova Remnant 3C391: 6cm Polarimetry and Continuum Imaging, Mosaicking (CASA 4.1)

Calibrate EVLA full polarization data, image a mosaic of the region in full Stokes and create a spectral index map. Includes:

  • Inspecting data; basic flagging
  • Calibration
  • Image Analysis and Manipulation
  • Polarization Imaging
  • Spectral Index imaging
  • Self-calibration

EVLA Tutorials for more Advanced Users

  • Supernova SN2010FZ: Wide-band, narrow-field imaging; C-band (5-7 GHz) (CASA 4.1)

Calibrate and image a galaxy field for this mid-frequency EVLA observation. This includes:

  • Excising RFI from the data
  • Basic flagging and calibration steps
  • Imaging from one spectral window to full dataset
  • Using multi-scale, multi-frequency synthesis
  • Image analysis
  • Protostar G192.16-3.84: Wide-band, narrow-field imaging using 3-bit sampled data; Ka-band (27-38 GHz) (CASA 4.1)

Calibrate and image a protostar using this high-frequency VLA observation taken using the 3-bit samplers. Note that this tutorial can be used as a guide for 8-bit data as well. This includes:

  • Deleting bad data and RFI
  • Basic calibration, including tropospheric opacity and requantizer gain corrections
  • Bootstrapping to determine the spectrum of the bandpass calibration source
  • Imaging from a single spectral window to the full dataset
  • Using multi-frequency synthesis imaging
  • Image analysis
  • Supernova G55.7_3.4: Wide-band, wide-field imaging; L-band (1-2 GHz) (CASA 4.1)

This low-frequency EVLA tutorial for the observation of a supernova remnant focuses on RFI excision as well as imaging wide-field and wide-fractional-bandwidth data. This includes:

  • Basic flagging and evaluation
  • Different methods for automatic RFI excision
  • Calibrating the data
  • Exploring different imaging options: widefield, multi-scale, and multi-frequency synthesis

Specific Topics

Presents the basics of writing a CASA task, and provides examples of tasks that will be helpful and instructive.

Demonstrates the use of the contributed "stitch" task to edit data which has been obtained in an overlapping subband mode.


CASA 3.4 versions

CASA 3.3 versions