Peter J. Macgregor
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View article: Stingrays in the radio sky: Two unusual diffuse radio relic sources in the direction of the Magellanic Stream
Stingrays in the radio sky: Two unusual diffuse radio relic sources in the direction of the Magellanic Stream Open
We present the discovery of two extended, low surface-brightness radio continuum sources, each consisting of a near-circular body and an extended tail of emission, nicknamed Stingray 1 (ASKAP J0129–5350) and Stingray 2 (ASKAP J0245–5642). …
View article: Diprotodon on the sky. The Large Galactic Supernova Remnant (SNR) G278.94+1.35
Diprotodon on the sky. The Large Galactic Supernova Remnant (SNR) G278.94+1.35 Open
We present a re-discovery of G278.94+1.35 as possibly one of the largest known Galactic supernova remnants (SNR) - that we name Diprotodon. While previously established as a Galactic SNR, Diprotodon is visible in our new EMU and GLEAM radi…
View article: MeerKAT discovery of a MIGHTEE Odd Radio Circle
MeerKAT discovery of a MIGHTEE Odd Radio Circle Open
We present the discovery of a new Odd Radio Circle (ORC J0219−0505) in 1.2 GHz radio continuum data from the MIGHTEE survey taken with the MeerKAT telescope. The radio-bright host is a massive elliptical galaxy, which shows extended stella…
View article: MeerKAT discovery of a MIGHTEE Odd Radio Circle
MeerKAT discovery of a MIGHTEE Odd Radio Circle Open
We present the discovery of a new Odd Radio Circle (ORC J0219--0505) in 1.2~GHz radio continuum data from the MIGHTEE survey taken with the MeerKAT telescope. The radio-bright host is a massive elliptical galaxy, which shows extended stell…
View article: Evolutionary map of the universe (EMU): Observations of filamentary structures in the Abell S1136 galaxy cluster
Evolutionary map of the universe (EMU): Observations of filamentary structures in the Abell S1136 galaxy cluster Open
We present radio observations of the galaxy cluster Abell S1136 at 888 MHz, using the Australian Square Kilometre Array Pathfinder radio telescope, as part of the Evolutionary Map of the Universe Early Science program. We compare these fin…
View article: Diprotodon on the sky. The Large Galactic Supernova Remnant (SNR) G278.94+1.35
Diprotodon on the sky. The Large Galactic Supernova Remnant (SNR) G278.94+1.35 Open
We present a re-discovery of G278.94+1.35 a as possibly one of the largest known Galactic supernova remnants (SNRs) – that we name Diprotodon. While previously established as a Galactic SNR, Diprotodon is visible in our new Evolutionary Ma…
View article: ATCA study of Small Magellanic Cloud supernova remnant 1E 0102.2–7219
ATCA study of Small Magellanic Cloud supernova remnant 1E 0102.2–7219 Open
We present new and archival Australia Telescope Compact Array and Atacama Large Millimeter/submillimeter Array data of the Small Magellanic Cloud supernova remnant 1E 0102.2–7219 at 2100, 5500, 9000, and 108 000 MHz; as well as H i data pr…
View article: COALAS II. Extended molecular gas reservoirs are common in a distant, forming galaxy cluster
COALAS II. Extended molecular gas reservoirs are common in a distant, forming galaxy cluster Open
This paper presents the results of 475h of interferometric observations with the Australia Telescope Compact Array towards the Spiderweb protocluster at z=2.16. We search for large, extended molecular gas reservoirs among 46 previously det…
View article: COALAS II. Extended molecular gas reservoirs are common in a distant, forming galaxy cluster
COALAS II. Extended molecular gas reservoirs are common in a distant, forming galaxy cluster Open
This paper presents the results of 475 hours of interferometric observations with the Australia Telescope Compact Array towards the Spiderweb protocluster at \(z=2.16\). We search for large, extended molecular gas reservoirs among 46 previ…
View article: EMU Detection of a Large and Low Surface Brightness Galactic SNR G288.8–6.3
EMU Detection of a Large and Low Surface Brightness Galactic SNR G288.8–6.3 Open
We present the serendipitous detection of a new Galactic supernova remnant (SNR), G288.8–6.3, using data from the Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe (EMU) survey. Using multifrequency anal…
View article: EMU Detection of a Large and Low Surface Brightness Galactic SNR G288.8-6.3
EMU Detection of a Large and Low Surface Brightness Galactic SNR G288.8-6.3 Open
We present the serendipitous detection of a new Galactic Supernova Remnant (SNR), G288.8-6.3 using data from the Australian Square Kilometre Array Pathfinder (ASKAP)-Evolutionary Map of the Universe (EMU) survey. Using multi-frequency anal…
View article: MeerKAT uncovers the physics of an odd radio circle
MeerKAT uncovers the physics of an odd radio circle Open
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 fi…
View article: Mysterious odd radio circle near the large magellanic cloud – an intergalactic supernova remnant?
Mysterious odd radio circle near the large magellanic cloud – an intergalactic supernova remnant? Open
We report the discovery of J0624–6948, a low-surface brightness radio ring, lying between the Galactic Plane and the large magellanic cloud (LMC). It was first detected at 888 MHz with the Australian Square Kilometre Array Pathfinder (ASKA…
View article: Odd Radio Circles and Their Environment
Odd Radio Circles and Their Environment Open
Odd Radio Circles (ORCs) are unexpected faint circles of diffuse radio emission discovered in recent wide deep radio surveys. They are typically about one arcmin in diameter, and may be spherical shells of synchrotron emission about a mill…
View article: The Evolutionary Map of the Universe pilot survey
The Evolutionary Map of the Universe pilot survey Open
We present the data and initial results from the first pilot survey of the Evolutionary Map of the Universe (EMU), observed at 944 MHz with the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The survey covers $270 \,\mathr…