Astronomy-General
Published September 1, 2016 | Version v1
Dataset Open

Radio variability in the Phoenix Deep Survey at 1.4 GHz

Creators

  • 1. International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), The University of Sydney, NSW 2006, Australia
  • 2. Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia
  • 3. Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), The University of Sydney, NSW 2006, Australia; CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia
  • 4. Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), The University of Sydney, NSW 2006, Australia
  • 5. Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), The University of Sydney, NSW 2006, Australia; Dunlap Institute for Astronomy and Astrophysics, University of Toronto, ON M5S 3H4, Canada

Description

This repository contains the final images that were used in the production of the paper titled: " Radio variability in the Phoenix Deep Survey at 1.4 GHz"

Paper abstract:

We use archival data from the Phoenix Deep Survey to investigate the variable radio source population above 1 mJy beam-1 at 1.4 GHz. Given the similarity of this survey to other such surveys we take the opportunity to investigate the conflicting results which have appeared in the literature. Two previous surveys for variability conducted with the Very Large Array (VLA) achieved a sensitivity of 1 mJy beam-1. However, one survey found an areal density of radio variables on time-scales of decades that is a factor of ~4 times greater than a second survey which was conducted on time-scales of less than a few years. In the Phoenix deep field we measure the density of variable radio sources to be ρ = 0.98 deg-2 on time-scales of 6 months to 8 yr. We make use of Wide-field Infrared Survey Explorer infrared cross-ids, and identify all variable sources as an active galactic nucleus of some description. We suggest that the discrepancy between previous VLA results is due to the different time-scales probed by each of the surveys, and that radio variability at 1.4 GHz is greatest on time-scales of 2-5 yr.

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Additional details

Related works

Is supplement to
10.1093/mnras/stw1486 (DOI)
2016MNRAS.461.3314H (Bibcode)