Northwestern Events Calendar


Astro Seminar: David Kaplan: The ASKAP Variables and Slow Transients (VAST) Survey

When: Tuesday, April 4, 2023
3:45 PM - 4:15 PM Central

Where: 1800 Sherman Avenue, 7-600, Evanston, IL 60201 map it

Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students

Contact: Joan West   (847) 491-3645

Group: Physics and Astronomy Astrophysics Seminars

Category: Academic


The Variables and Slow Transients Survey (VAST) on the Australian
Square Kilometre Array Pathfinder (ASKAP) is designed to detect highly
variable and transient radio sources on timescales from 5 s to 5
yr. We present the survey description, observation strategy and
initial results from the VAST Phase I Pilot Survey. This pilot survey
consists of ~162 h of observations conducted at a central frequency of
888 MHz between 2019 August and 2020 August, with a typical rms
sensitivity of 0.24 mJy/beam, angular resolution of 12-20 arcseconds,
and 5-13 repeats covering 5000 square degrees. An initial search of
1646 square degrees revealed 28 highly variable and/or transient
sources, including known pulsars, flaring stars, active galactic
nuclei, and sources with no multi-wavelength counterpart. Targeted
searches including circular polarization of the Galactic Center and
Magellanic Clouds further identified a Galactic Center Radio Transient
and a very luminous pulsar. We discuss these findings and plans for a
full 5-year survey which started in late 2022.

 David Kaplan, University of Wisconsin-Milwaukee

Host: Professor Giacomo Fragione

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