The GLEAM 4-Jy (G4Jy) Sample: II. Host galaxy identification for individual sources

White, SV; Franzen, TMO; Riseley, CJ; Ivy Wong, O; Kapińska, AD; Hurley-Walker, N; Callingham, JR; Thorat, K; Wu, C; Hancock, P; Hunstead, RW; Seymour, N; Swan, J; Wayth, R; Morgan, J; Chhetri, R; Jackson, C; Weston, S; Bell, M; Gaensler, BM; Johnston-Hollitt, M; Offringa, A; Staveley-Smith, L

The GLEAM 4-Jy (G4Jy) Sample: II. Host galaxy identification for individual sources

White, SV Franzen, TMO Riseley, CJ Ivy Wong, O Kapińska, AD Hurley-Walker, N Callingham, JR Thorat, K Wu, C Hancock, P Hunstead, RW Seymour, N Swan, J Wayth, R Morgan, J Chhetri, R Jackson, C Weston, S Bell, M

Gaensler, BM Johnston-Hollitt, M Offringa, A Staveley-Smith, L

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Publisher:: Cambridge University Press (CUP)
Publication Type:: Journal Article
Citation:: Publications of the Astronomical Society of Australia, 2020, 37, pp. e017
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	White, SV
dc.contributor.author	Franzen, TMO
dc.contributor.author	Riseley, CJ
dc.contributor.author	Ivy Wong, O
dc.contributor.author	Kapińska, AD
dc.contributor.author	Hurley-Walker, N
dc.contributor.author	Callingham, JR
dc.contributor.author	Thorat, K
dc.contributor.author	Wu, C
dc.contributor.author	Hancock, P
dc.contributor.author	Hunstead, RW
dc.contributor.author	Seymour, N
dc.contributor.author	Swan, J
dc.contributor.author	Wayth, R
dc.contributor.author	Morgan, J
dc.contributor.author	Chhetri, R
dc.contributor.author	Jackson, C
dc.contributor.author	Weston, S
dc.contributor.author	Bell, M https://orcid.org/0000-0003-1767-5277
dc.contributor.author	Gaensler, BM
dc.contributor.author	Johnston-Hollitt, M
dc.contributor.author	Offringa, A
dc.contributor.author	Staveley-Smith, L
dc.date.accessioned	2021-03-07T21:40:06Z
dc.date.available	2021-03-07T21:40:06Z
dc.date.issued	2020-01-01
dc.identifier.citation	Publications of the Astronomical Society of Australia, 2020, 37, pp. e017
dc.identifier.issn	1323-3580
dc.identifier.issn	1448-6083
dc.identifier.uri	http://hdl.handle.net/10453/146872
dc.description.abstract	© Astronomical Society of Australia 2020; published by Cambridge University Press. The entire southern sky (Declination, d < 30°) has been observed using the Murchison Widefield Array (MWA), which provides radio imaging of ~2 arcmin resolution at low frequencies (72 231 MHz). This is the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey, and we have previously used a combination of visual inspection, cross-checks against the literature, and internal matching to identify the 'brightest' radio-sources (S151 MHz > 4 Jy) in the extragalactic catalogue (Galactic latitude, \|b\| > 10°). We refer to these 1 863 sources as the GLEAM 4-Jy (G4Jy) Sample, and use radio images (of =45 arcsec resolution), and multi-wavelength information, to assess their morphology and identify the galaxy that is hosting the radio emission (where appropriate). Details of how to access all of the overlays used for this work are available at https://github.com/svw26/G4Jy. Alongside this we conduct further checks against the literature, which we document here for individual sources. Whilst the vast majority of the G4Jy Sample are active galactic nuclei with powerful radio-jets, we highlight that it also contains a nebula, two nearby, star-forming galaxies, a cluster relic, and a cluster halo. There are also three extended sources for which we are unable to infer the mechanism that gives rise to the low-frequency emission. In the G4Jy catalogue we provide mid-infrared identifications for 86% of the sources, and flag the remainder as: having an uncertain identification (129 sources), having a faint/uncharacterised midinfrared host (126 sources), or it being inappropriate to specify a host (2 sources). For the subset of 129 sources, there is ambiguity concerning candidate host-galaxies, and this includes four sources (B0424 728, B0703 451, 3C 198, and 3C 403.1) where we question the existing identification.
dc.language	en
dc.publisher	Cambridge University Press (CUP)
dc.relation.ispartof	Publications of the Astronomical Society of Australia
dc.relation.isbasedon	10.1017/pasa.2020.10
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0201 Astronomical and Space Sciences, 0299 Other Physical Sciences
dc.subject.classification	Astronomy & Astrophysics
dc.title	The GLEAM 4-Jy (G4Jy) Sample: II. Host galaxy identification for individual sources
dc.type	Journal Article
utslib.citation.volume	37
utslib.for	0201 Astronomical and Space Sciences
utslib.for	0299 Other Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2021-03-07T21:39:58Z
pubs.publication-status	Published
pubs.volume	37

Abstract:

© Astronomical Society of Australia 2020; published by Cambridge University Press. The entire southern sky (Declination, d < 30°) has been observed using the Murchison Widefield Array (MWA), which provides radio imaging of ~2 arcmin resolution at low frequencies (72 231 MHz). This is the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey, and we have previously used a combination of visual inspection, cross-checks against the literature, and internal matching to identify the 'brightest' radio-sources (S151 MHz > 4 Jy) in the extragalactic catalogue (Galactic latitude, |b| > 10°). We refer to these 1 863 sources as the GLEAM 4-Jy (G4Jy) Sample, and use radio images (of =45 arcsec resolution), and multi-wavelength information, to assess their morphology and identify the galaxy that is hosting the radio emission (where appropriate). Details of how to access all of the overlays used for this work are available at https://github.com/svw26/G4Jy. Alongside this we conduct further checks against the literature, which we document here for individual sources. Whilst the vast majority of the G4Jy Sample are active galactic nuclei with powerful radio-jets, we highlight that it also contains a nebula, two nearby, star-forming galaxies, a cluster relic, and a cluster halo. There are also three extended sources for which we are unable to infer the mechanism that gives rise to the low-frequency emission. In the G4Jy catalogue we provide mid-infrared identifications for 86% of the sources, and flag the remainder as: having an uncertain identification (129 sources), having a faint/uncharacterised midinfrared host (126 sources), or it being inappropriate to specify a host (2 sources). For the subset of 129 sources, there is ambiguity concerning candidate host-galaxies, and this includes four sources (B0424 728, B0703 451, 3C 198, and 3C 403.1) where we question the existing identification.

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http://hdl.handle.net/10453/146872