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Title:
High-resolution observations of low-luminosity gigahertz-peaked spectrum and compact steep-spectrum sources
Authors:
Collier, J. D.; Tingay, S. J.; Callingham, J. R.; Norris, R. P.; Filipovic, M. D.; Galvin, T. J.; Huynh, M. T.; Intema, H. T.; Marvil, J.; O'Brien, A. N.; Roper, Q.; Sirothia, S.; Tothill, N. F. H.; Bell, M. E.; For, B.-Q.; Gaensler, B. M.; Hancock, P. J.; Hindson, L.; Hurley-Walker, N.; Johnston-Hollitt, M.; Kapinska, A. D.; Lenc, E.; Morgan, J.; Procopio, P.; Staveley-Smith, L.; Wayth, R. B.; Wu, C.; Zheng, Q.; Heywood, I.; Popping, A.
Affiliation:
AA(CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia; Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia 0000-0002-2326-7432), AB(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia), AC(CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia 0000-0002-7167-1819), AD(CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia; Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia), AE(Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia), AF(CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia; Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia; International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia), AG(CSIRO Astronomy and Space Science (CASS), 26 Dick Perry Avenue, Kensington, WA 6151, Australia; International Centre for Radio Astronomy Research (ICRAR), M468, University of Western Australia, Crawley, WA 6009, Australia), AH(National Radio Astronomy Observatory (NRAO), 1003 Lopezville Road, Socorro, NM 87801-0387, USA; Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands), AI(CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia), AJ(CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia; Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia), AK(Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia), AL(Square Kilometre Array South Africa, 3rd Floor, The Park, Park Road, Pinelands, Cape Town 7405, South Africa; Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa), AM(Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia), AN(CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia; University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia), AO(International Centre for Radio Astronomy Research (ICRAR), M468, University of Western Australia, Crawley, WA 6009, Australia 0000-0002-0196-5248), AP(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia; Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George St, ON M5S 3H4, Canada 0000-0002-3382-9558), AQ(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia), AR(School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand; Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK), AS(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia 0000-0002-5119-4808), AT(School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand; Peripety Scientific Ltd, PO Box 11355 Manners Street, Wellington 6142, New Zealand), AU(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia; International Centre for Radio Astronomy Research (ICRAR), M468, University of Western Australia, Crawley, WA 6009, Australia), AV(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia), AW(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia), AX(School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia), AY(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia; International Centre for Radio Astronomy Research (ICRAR), M468, University of Western Australia, Crawley, WA 6009, Australia 0000-0002-8057-0294), AZ(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia), BA(International Centre for Radio Astronomy Research (ICRAR), M468, University of Western Australia, Crawley, WA 6009, Australia), BB(School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand; Peripety Scientific Ltd, PO Box 11355 Manners Street, Wellington 6142, New Zealand), BC(CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia; Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa; Astrophysics, Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK), BD(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Australia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 477, Issue 1, p.578-592 (MNRAS Homepage)
Publication Date:
06/2018
Origin:
OUP
Astronomy Keywords:
methods: data analysis, techniques: image processing, galaxies: active, galaxies: evolution, galaxies: jets, radio continuum: galaxies
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sty564
Bibliographic Code:
2018MNRAS.477..578C

Abstract

We present very long baseline interferometry observations of a faint and low-luminosity (L1.4 GHz < 1027 W Hz-1) gigahertz-peaked spectrum (GPS) and compact steep-spectrum (CSS) sample. We select eight sources from deep radio observations that have radio spectra characteristic of a GPS or CSS source and an angular size of theta ≲ 2 arcsec, and detect six of them with the Australian Long Baseline Array. We determine their linear sizes, and model their radio spectra using synchrotron self-absorption (SSA) and free-free absorption (FFA) models. We derive statistical model ages, based on a fitted scaling relation, and spectral ages, based on the radio spectrum, which are generally consistent with the hypothesis that GPS and CSS sources are young and evolving. We resolve the morphology of one CSS source with a radio luminosity of 10^{25} W Hz^{-1}, and find what appear to be two hotspots spanning 1.7 kpc. We find that our sources follow the turnover-linear size relation, and that both homogeneous SSA and an inhomogeneous FFA model can account for the spectra with observable turnovers. All but one of the FFA models do not require a spectral break to account for the radio spectrum, while all but one of the alternative SSA and power-law models do require a spectral break to account for the radio spectrum. We conclude that our low-luminosity sample is similar to brighter samples in terms of their spectral shape, turnover frequencies, linear sizes, and ages, but cannot test for a difference in morphology.
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