Discovery of a new extragalactic circular radio source with ASKAP: ORC J0102–2450

Abstract We present the discovery of another Odd Radio Circle (ORC) with the Australian Square Kilometre Array Pathfinder (ASKAP) at 944 MHz. The observed radio ring, ORC J0102–2450, has a diameter of ∼70 arcsec or 300 kpc, if associated with the central elliptical galaxy DES J010224.33–245039.5 (z ∼ 0.27). Considering the overall radio morphology (circular ring and core) and lack of ring emission at non-radio wavelengths, we investigate if ORC J0102–2450 could be the relic lobe of a giant radio galaxy seen end-on or the result of a giant blast wave. We also explore possible interaction scenarios, for example, with the companion galaxy, DES J010226.15–245104.9, located in or projected onto the south-eastern part of the ring. We encourage the search for further ORCs in radio surveys to study their properties and origin.

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3C236 - The Giant Radio Galaxy with a Compact Steep Spectrum Nucleus and a Compact Two-Sided Jet

Symposium - International Astronomical Union ◽

10.1017/s0074180900134242 ◽

1988 ◽

Vol 129 ◽

pp. 127-128

Author(s):

R. T. Schilizzi ◽

E. D. Skillman ◽

G. K. Miley ◽

P. D. Barthel ◽

J. M. Benson ◽

...

Keyword(s):

Radio Source ◽

Flux Density ◽

Radio Galaxy ◽

Elliptical Galaxy ◽

Double Structure

3C236 is the largest radio source known. It has a 39 arcmin double structure (3.0 Mpc, Ho=75 kms−1 Mpc−1) in which the SE lobe is narrow and edge-brightened and the NW lobe more diffuse and centre-brightened (Barthel et al., 1985). About half the flux density comes from a steep spectrum (α = −0.7) radio core of overall size 1.3 arcsec (2.2 kpc) located in the centre of a 17m elliptical galaxy with redshift 0.0988.

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The Extraordinary Radio Galaxy MRC B1221–423

Publications of the Astronomical Society of Australia ◽

10.1071/as02029 ◽

2003 ◽

Vol 20 (1) ◽

pp. 1-5 ◽

Cited By ~ 6

Author(s):

V. Safouris ◽

R. W. Hunstead ◽

O. R. Prouton

Keyword(s):

Radio Source ◽

Radio Galaxy ◽

Early Stage ◽

Elliptical Galaxy ◽

Empirical Relationship ◽

Host Galaxy ◽

Narrow Line ◽

Powerful Radio ◽

Double Structure ◽

The Core

AbstractMRC B1221–423 is a compact steep spectrum (CSS) radio source in the core of a remarkable elliptical galaxy. We examine its environment with long-slit spectra and multicolour images. A high-resolution synthesis image shows the radio source to have a 1″.5 (5.7 kpc) double structure. We use the empirical relationship between jet kinetic power and narrow line luminosity to infer a source age of ˜105 yr. The z = 0.1706 host galaxy is clearly disturbed, with tidal features and shells providing plausible evidence for a merger with one or more close companions. This evidence leads us to conclude that B1221–423 may be the progenitor of a much larger source, caught at an early stage in its radio evolution. We speculate that it is the interaction and accompanying events which have triggered this young powerful radio source.

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