MeerKAT uncovers the physics of an odd radio circle

Ray P. Norris; J. D. Collier; Roland M. Crocker; Ian Heywood; Peter Macgregor; L. Rudnick; Stas Shabala; Heinz Andernach; Elisabete Da Cunha; Jayanne English; Miroslav Filipović; Bärbel S. Koribalski; Kieran Luken; Aaron Robotham; Srikrishna Sekhar; Jessica E. Thorne; Tessa Vernstrom

doi:10.1093/mnras/stac701

MeerKAT uncovers the physics of an odd radio circle

Ray P. Norris, J. D. Collier, Roland M. Crocker, Ian Heywood, Peter Macgregor, L. Rudnick, Stas Shabala, Heinz Andernach, Elisabete Da Cunha, Jayanne English, Miroslav Filipović, Bärbel S. Koribalski, Kieran Luken, Aaron Robotham, Srikrishna Sekhar, Jessica E. Thorne, Tessa Vernstrom

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

Odd radio circles (ORCs) are recently-discovered faint diffuse circles of radio emission, of unknown cause, surrounding galaxies at moderate redshift (z ∼0.2-0.6). Here, we present detailed new MeerKAT radio images at 1284 MHz of the first ORC, originally discovered with the Australian Square Kilometre Array Pathfinder, with higher resolution (6 arcsec) and sensitivity (∼2.4 μJy/beam). In addition to the new images, which reveal a complex internal structure consisting of multiple arcs, we also present polarization and spectral index maps. Based on these new data, we consider potential mechanisms that may generate the ORCs.

Original language	English
Pages (from-to)	1300-1316
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	513
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stac701
Publication status	Published - 1 Jun 2022

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Norris, R. P., Collier, J. D., Crocker, R. M., Heywood, I., Macgregor, P., Rudnick, L., Shabala, S., Andernach, H., Da Cunha, E., English, J., Filipović, M., Koribalski, B. S., Luken, K., Robotham, A., Sekhar, S., Thorne, J. E., & Vernstrom, T. (2022). MeerKAT uncovers the physics of an odd radio circle. Monthly Notices of the Royal Astronomical Society, 513(1), 1300-1316. https://doi.org/10.1093/mnras/stac701

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abstract = "Odd radio circles (ORCs) are recently-discovered faint diffuse circles of radio emission, of unknown cause, surrounding galaxies at moderate redshift (z ∼0.2-0.6). Here, we present detailed new MeerKAT radio images at 1284 MHz of the first ORC, originally discovered with the Australian Square Kilometre Array Pathfinder, with higher resolution (6 arcsec) and sensitivity (∼2.4 μJy/beam). In addition to the new images, which reveal a complex internal structure consisting of multiple arcs, we also present polarization and spectral index maps. Based on these new data, we consider potential mechanisms that may generate the ORCs. ",

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author = "Norris, {Ray P.} and Collier, {J. D.} and Crocker, {Roland M.} and Ian Heywood and Peter Macgregor and L. Rudnick and Stas Shabala and Heinz Andernach and {Da Cunha}, Elisabete and Jayanne English and Miroslav Filipovi{\'c} and Koribalski, {B{\"a}rbel S.} and Kieran Luken and Aaron Robotham and Srikrishna Sekhar and Thorne, {Jessica E.} and Tessa Vernstrom",

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doi = "10.1093/mnras/stac701",

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Norris, RP, Collier, JD, Crocker, RM, Heywood, I, Macgregor, P, Rudnick, L, Shabala, S, Andernach, H, Da Cunha, E, English, J, Filipović, M, Koribalski, BS, Luken, K, Robotham, A, Sekhar, S, Thorne, JE & Vernstrom, T 2022, 'MeerKAT uncovers the physics of an odd radio circle', Monthly Notices of the Royal Astronomical Society, vol. 513, no. 1, pp. 1300-1316. https://doi.org/10.1093/mnras/stac701

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T1 - MeerKAT uncovers the physics of an odd radio circle

AU - Norris, Ray P.

AU - Collier, J. D.

AU - Crocker, Roland M.

AU - Heywood, Ian

AU - Macgregor, Peter

AU - Rudnick, L.

AU - Shabala, Stas

AU - Andernach, Heinz

AU - Da Cunha, Elisabete

AU - English, Jayanne

AU - Filipović, Miroslav

AU - Koribalski, Bärbel S.

AU - Luken, Kieran

AU - Robotham, Aaron

AU - Sekhar, Srikrishna

AU - Thorne, Jessica E.

AU - Vernstrom, Tessa

PY - 2022/6/1

Y1 - 2022/6/1

N2 - Odd radio circles (ORCs) are recently-discovered faint diffuse circles of radio emission, of unknown cause, surrounding galaxies at moderate redshift (z ∼0.2-0.6). Here, we present detailed new MeerKAT radio images at 1284 MHz of the first ORC, originally discovered with the Australian Square Kilometre Array Pathfinder, with higher resolution (6 arcsec) and sensitivity (∼2.4 μJy/beam). In addition to the new images, which reveal a complex internal structure consisting of multiple arcs, we also present polarization and spectral index maps. Based on these new data, we consider potential mechanisms that may generate the ORCs.

AB - Odd radio circles (ORCs) are recently-discovered faint diffuse circles of radio emission, of unknown cause, surrounding galaxies at moderate redshift (z ∼0.2-0.6). Here, we present detailed new MeerKAT radio images at 1284 MHz of the first ORC, originally discovered with the Australian Square Kilometre Array Pathfinder, with higher resolution (6 arcsec) and sensitivity (∼2.4 μJy/beam). In addition to the new images, which reveal a complex internal structure consisting of multiple arcs, we also present polarization and spectral index maps. Based on these new data, we consider potential mechanisms that may generate the ORCs.

KW - galaxies: General

KW - radio continuum: Galaxies

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U2 - 10.1093/mnras/stac701

DO - 10.1093/mnras/stac701

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VL - 513

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EP - 1316

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

MeerKAT uncovers the physics of an odd radio circle

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