Radio observations of the merging galaxy cluster system Abell 3391-Abell 3395

Brüggen, M.; Reiprich, T. H.; Bulbul, Esra; Koribalski, B. S.; Andernach, H.; Rudnick, Lawrence; Hoang, D. N.; Wilber, A.; Duchesne, S. W.; Veronica, A.; Pacaud, F.; Hopkins, A. M.; Norris, Ray; Johnston‐Hollitt, M.; Brown, M. J. I.; Bonafede, A.; Brunetti, G.; Collier, Jordan D.; Sanders, J. S.; Vardoulaki, E.; Venturi, T.; Kapińska, A. D.; Marvil, J.

doi:10.1051/0004-6361/202039533

Cited by 37 publications

(47 citation statements)

References 81 publications

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“…In a recent ASKAP observation covering 30 deg 2 centred on the Abell 3391/3395 galaxy cluster pair, and of comparable depth and angular resolution as the EMU-PS, Brüggen et al (2021) found the surface density of GRGs 1 Mpc to be ∼0.8 deg −2 , and that of GRGs 0.7 Mpc to be at least ∼1.7 deg −2 , suggesting that the EMU-PS should contain ∼200 and ∼460 such GRGs, respectively.…”

Section: Giant Radio Galaxiesmentioning

confidence: 98%

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The Evolutionary Map of the Universe pilot survey

Norris

Marvil

Collier

et al. 2021

Publ. Astron. Soc. Aust.

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108

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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 $270 \,\mathrm{deg}^2$ of an area covered by the Dark Energy Survey, reaching a depth of 25–30 $\mu\mathrm{Jy\ beam}^{-1}$ rms at a spatial resolution of $\sim$ 11–18 arcsec, resulting in a catalogue of $\sim$ 220 000 sources, of which $\sim$ 180 000 are single-component sources. Here we present the catalogue of single-component sources, together with (where available) optical and infrared cross-identifications, classifications, and redshifts. This survey explores a new region of parameter space compared to previous surveys. Specifically, the EMU Pilot Survey has a high density of sources, and also a high sensitivity to low surface brightness emission. These properties result in the detection of types of sources that were rarely seen in or absent from previous surveys. We present some of these new results here.

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Section: Giant Radio Galaxiesmentioning

confidence: 98%

“…Early EMU/eROSITA results on the Abell 3391/95 galaxy cluster system (Reiprich et al 2021;Brüggen et al 2021) have already helped constrain physical processes in the merger. We show two additional examples of diffuse radio sources detected in the EMU-PS area in Figures 33 and 34.…”

Section: Clusters Of Galaxiesmentioning

confidence: 99%

The Evolutionary Map of the Universe pilot survey

Norris

Marvil

Collier

et al. 2021

Publ. Astron. Soc. Aust.

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108

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“…All-sky Aitoff projection of the distribution of our newly discovered GRS in red, together with the GRS from six major published GRS lists, which are in black from [5], in orange from [15], in dark blue from [59], in dark green from [60], in dark magenta from [16], and in dark red from [46]. The thick blue line shows the area within |b| ≤ 2 • from the Galactic plane.…”

Section: Determination Of Radio Flux Densities and Luminositiesmentioning

confidence: 99%

“…The literature compilation of GRGs by [5] contains 223 objects larger than 1 Mpc, and after that, four further large samples of GRGs and one of GRQs were published. These contain (after correction of their LAS measures and exclusion of a few spurious objects consisting of separate sources) 68, 48, 18, and 25 GRS from [15,16,59,60] and 76 GRQs from [46]. This makes a total of 458 GRS published, neglecting here a few others that were reported in much smaller numbers in various papers, sometimes not even mentioning their GRS nature.…”

Section: Comparison Of Our Sample With Previously Published Grsmentioning

confidence: 99%

“…Thus, the latest literature compilation [5] lists 213 GRS, of which 20 (9.4%) lie south of Dec = −40 • , an area of 17.9% of the sky. Only recently, with the advent of sensitive low-frequency surveys such as the LOFAR Two-metre Sky Survey (LoTSS, [13]) and those performed with the Australian Square Kilometre Array Pathfinder (ASKAP, see [14]) more GRS are being found in both hemispheres [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Discovery of 178 Giant Radio Galaxies in 1059 deg2 of the Rapid ASKAP Continuum Survey at 888 MHz

2021

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We report the results of a visual inspection of images of the Rapid ASKAP Continuum Survey (RACS) in search of extended radio galaxies (ERG) that reach or exceed linear sizes on the order of one Megaparsec. We searched a contiguous area of 1059 deg2 from RAJ = 20h20m to 06h20m, and −50∘<DecJ<−40∘, which is covered by deep multi-band optical images of the Dark Energy Survey (DES) and in which previously only three ERGs larger than 1 Mpc had been reported. For over 1800 radio galaxy candidates inspected, our search in optical and infrared images resulted in hosts for 1440 ERG, for which spectroscopic and photometric redshifts from various references were used to convert their largest angular size (LAS) to projected linear size (LLS). This resulted in 178 newly discovered giant radio sources (GRS) with LLS >1 Mpc, of which 18 exceed 2 Mpc and the largest one is 3.4 Mpc. Their redshifts range from 0.02 to ∼2.0, but only 10 of the 178 new GRS have spectroscopic redshifts. For the 146 host galaxies, the median r-band magnitude and redshift are 20.9 and 0.64, while for the 32 quasars or candidates these are 19.7 and 0.75. Merging the six most recent large compilations of GRS results in 458 GRS larger than 1 Mpc, so we were able to increase this number by ∼39% to 636.

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Evolutionary Map of the Universe (EMU): A pilot search for diffuse, non-thermal radio emission in galaxy clusters with the Australian SKA Pathfinder

Duchesne,

Botteon,

Koribalski

et al. 2024

Publ. Astron. Soc. Aust.

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Clusters of galaxies have been found to host Mpc-scale diffuse, non-thermal radio emission in the form of central radio halos and peripheral relics. Turbulence and shock-related processes in the intra-cluster medium are generally considered responsible for the emission, though details of these processes are still not clear. The low surface brightness makes detection of the emission a challenge, but with recent surveys with high-sensitivity radio telescopes we are beginning to build large samples of these sources. The Evolutionary Map of the Universe (EMU) is a Southern Sky survey being performed by the Australian SKA Pathfinder (ASKAP) over the next few years and is well-suited to detect and characterise such emission. To assess prospects of the full survey, we have performed a pilot search of diffuse sources in 71 clusters from the Planck Sunyaev–Zeldovich (SZ) cluster catalogue (PSZ2) found in archival ASKAP observations. After re-imaging the archival data and performing both (u, v)-plane and image-plane angular scale filtering, we detect 21 radio halos (12 for the first time, excluding an additional six candidates), 11 relics (in seven clusters, and six for the first time, excluding a further five candidate relics), along with 12 other, unclassified diffuse radio sources. From these detections, we predict the full EMU survey will uncover up to ≈ 254 radio halos and ≈ 85 radio relics in the 858 PSZ2 clusters that will be covered by EMU. The percentage of clusters found to host diffuse emission in this work is similar to the number reported in recent cluster surveys with the LOw Frequency ARray (LOFAR) Two-metre Sky Survey (Botteon, et al. 2022a, A&A, 660, A78), suggesting EMU will complement similar searches being performed in the Northern Sky and provide us with statistically significant samples of halos and relics at the completion of the full survey. This work presents the first step towards large samples of the diffuse radio sources in Southern Sky clusters with ASKAP and eventually the SKA.

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Radio observations of the merging galaxy cluster system Abell 3391-Abell 3395

Cited by 37 publications

References 81 publications

The Evolutionary Map of the Universe pilot survey

The Evolutionary Map of the Universe pilot survey

Discovery of 178 Giant Radio Galaxies in 1059 deg2 of the Rapid ASKAP Continuum Survey at 888 MHz

Evolutionary Map of the Universe (EMU): A pilot search for diffuse, non-thermal radio emission in galaxy clusters with the Australian SKA Pathfinder

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