The Giant Radio Galaxy 0319-45 (MSH 03-43)

Jones, Paul

doi:10.1017/s1323358000022979

Cited by 9 publications

(1 citation statement)

References 16 publications

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“…A spectral index map by Safouris et al (2009) shows flat spectrum radio emission associated with the core and so provides further confirmation that the host galaxy has been identified correctly. Being at z = 0.063 (Jones 1989), the 25. 6 separation of the radio lobes corresponds to a projected size of 1.9 Mpc, making this source another GRG.…”

Section: Known Giant Radio Galaxiesmentioning

confidence: 99%

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

White

Franzen

Riseley

et al. 2020

Publ. Astron. Soc. Aust.

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The entire southern sky (Declination, $\delta< 30^{\circ}$ ) has been observed using the Murchison Widefield Array (MWA), which provides radio imaging of $\sim$ 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 ( $S_{\mathrm{151\,MHz}}>4$ Jy) in the extragalactic catalogue (Galactic latitude, $|b| >10^{\circ}$ ). We refer to these 1 863 sources as the GLEAM 4-Jy (G4Jy) Sample, and use radio images (of ${\leq}45$ 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 mid-infrared 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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Section: Known Giant Radio Galaxiesmentioning

confidence: 99%

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

White

Franzen

Riseley

et al. 2020

Publ. Astron. Soc. Aust.

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Bilateral symmetry in active galaxies

Banhatti

1998

Physics Reports

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Search and analysis of giant radio galaxies with associated nuclei (SAGAN)

Dabhade

Mahato

Bagchi

et al. 2020

A&A

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We present the first results of a project called SAGAN, which is dedicated solely to the studies of relatively rare megaparsec-scale radio galaxies in the Universe, called giant radio galaxies (GRGs). We have identified 162 new GRGs primarily from the NRAO VLA Sky Survey with sizes ranging from ∼0.71 Mpc to ∼2.82 Mpc in the redshift range of ∼0.03−0.95, of which 23 are hosted by quasars (giant radio quasars). As part of the project SAGAN, we have created a database of all known GRGs, the GRG catalogue, from the literature (including our new sample); it includes 820 sources. For the first time, we present the multi-wavelength properties of the largest sample of GRGs. This provides new insights into their nature. Our results establish that the distributions of the radio spectral index and the black hole mass of GRGs do not differ from the corresponding distributions of normal-sized radio galaxies (RGs). However, GRGs have a lower Eddington ratio than RGs. Using the mid-infrared data, we classified GRGs in terms of their accretion mode: either a high-power radiatively efficient high-excitation state, or a radiatively inefficient low-excitation state. This enabled us to compare key physical properties of their active galactic nuclei, such as the black hole mass, spin, Eddington ratio, jet kinetic power, total radio power, magnetic field, and size. We find that GRGs in high-excitation state statistically have larger sizes, stronger radio power, jet kinetic power, and higher Eddington ratio than those in low-excitation state. Our analysis reveals a strong correlation between the black hole Eddington ratio and the scaled jet kinetic power, which suggests a disc-jet coupling. Our environmental study reveals that ∼10% of all GRGs may reside at the centres of galaxy clusters, in a denser galactic environment, while the majority appears to reside in a sparse environment. The probability of finding the brightest cluster galaxy as a GRG is quite low and even lower for high-mass clusters. We present new results for GRGs that range from black hole mass to large-scale environment properties. We discuss their formation and growth scenarios, highlighting the key physical factors that cause them to reach their gigantic size.

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The Giant Radio Galaxy 0319-45 (MSH 03-43)

Cited by 9 publications

References 16 publications

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

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

Bilateral symmetry in active galaxies

Search and analysis of giant radio galaxies with associated nuclei (SAGAN)

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