Journal article
Extragalactic Peaked-spectrum Radio Sources at Low Frequencies
JR Callingham, RD Ekers, BM Gaensler, JLB Line, N Hurley-Walker, EM Sadler, SJ Tingay, PJ Hancock, ME Bell, KS Dwarakanath, BQ For, TMO Franzen, L Hindson, M Johnston-Hollitt, AD Kapińska, E Lenc, B McKinley, J Morgan, AR Offringa, P Procopio Show all
Astrophysical Journal | IOP PUBLISHING LTD | Published : 2017
Abstract
We present a sample of 1483 sources that display spectral peaks between 72 MHz and 1.4 GHz, selected from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. The GLEAM survey is the widest fractional bandwidth all-sky survey to date, ideal for identifying peaked-spectrum sources at low radio frequencies. Our peaked-spectrum sources are the low-frequency analogs of gigahertz-peaked spectrum (GPS) and compact-steep spectrum (CSS) sources, which have been hypothesized to be the precursors to massive radio galaxies. Our sample more than doubles the number of known peaked-spectrum candidates, and 95% of our sample have a newly characterized spectral peak. We highlight..
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Awarded by Australian Government
Funding Acknowledgements
This scientific work makes use of the Murchison Radioastronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. Support for the operation of the MWA is provided by the Australian Government (NCRIS), under a contract to Curtin University administered by Astronomy Australia Limited. We acknowledge the Pawsey Supercomputing Centre, which is supported by the Western Australian and Australian Governments. This research was conducted by the Australian Research Council Centre of Excellence for Allsky Astrophysics (CAASTRO), through project number CE110001020. J.R.C. acknowledges the support of the Australian Postgraduate Award. The Dunlap Institute is funded through an endowment established by the David Dunlap family and the University of Toronto. B.M.G. acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC) through grant RGPIN-2015-05948, and of the Canada Research Chairs program. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and the VizieR catalog access tool, CDS, Strasbourg, France. Topcat (Taylor 2005), SAOImage DS9, NASA's Astrophysics Data System bibliographic services, and Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013), were also used in this study.