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An Overview of the VLA Sky Survey (VLASS) and New Data Products

Presentation #118.03 in the session Large Surveys, Programs and Catalogs.

Published onJul 01, 2023
An Overview of the VLA Sky Survey (VLASS) and New Data Products

The NRAO Karl G. Jansky Very Large Array (VLA) is currently observing the third epoch of the VLA Sky Survey (VLASS). VLASS is a synoptic, wide-field radio sky survey with a unique combination of high angular resolution (approx 2.5arcsec), sensitivity (approx. 140 microJy/beam 1σ per epoch), full linear Stokes polarimetry, time domain coverage (3 epochs, 32-month cadence), and wide bandwidth (2-4 GHz). Started in 2017, by the time of its completion in 2024, VLASS will have used approximately 5500 hr of time to cover a total of 33,885 square degrees (Dec. > -40deg). In this presentation, I will give an overview of VLASS including the data products, quality assurance procedures, new science highlights, and an update on the current survey status and future plans. We summarize the design of the VLASS and its data products along with the science goals supported by the components. The synoptic nature of the 3-epoch survey and prompt availability of Quicklook images has opened the radio time domain and enabled the discovery of new classes of variable and transient radio sources. Most recently, early releases of higher quality Single-Epoch continuum images and polarimetric cubes will fuel studies of cosmic magnetism and the spectral characterization of the VLASS detected sources, both galactic and extragalactic in origin. Examples of these products will be shown including a performance assessment. Both basic and enhanced data products will be described. We will also discuss the latest timeline for deliverables and improvements to the survey products.

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