The 1.28 GHz MeerKAT DEEP2 Image

Mauch, T.; Cotton, W. D.; Condon, J. J.; Matthews, A. M.; Abbott, T. D.; Adam, R.; Aldera, M. A.; Asad, K. M. B.; Bauermeister, E. F.; Bennett, Thomas; Bester, Hertzog L.; Botha, D. H.; Brederode, L. R. S.; Brits, Z. B.; Buchner, S.; Burger, J. P.; Camilo, F.; Chalmers, J. M.; Cheetham, T.; Villiers, Dirk de; Villiers, Mattieu S. de; Dikgale-Mahlakoana, M. A.; Toit, L. J. du; Esterhuyse, S. W. P.; Fadana, Gcobisa; Fanaroff, B. L.; Fataar, S.; February, Sean; Frank, B. S.; Gamatham, R. R. G.; Geyer, M.; Goedhart, S.; Gounden, S.; Gumede, S. C.; Heywood, Ian; Hlakola, M. J.; Horrell, Jasper; Hugo, B.; Isaacson, A. R.; Józsa, G. I. G.; Jonas, J. L.; Julie, Roufurd; Kapp, F.; Kasper, V. A.; Kenyon, J. S.; Kotzé, P.; Kriek, N.; Kriel, Herman; Kusel, T. W.; Lehmensiek, Robert; Loots, Anita; Lord, R. T.; Lunsky, B. M.; Madisa, K.; Magnus, Lindsay; Main, J. P. L.; Malan, J. A.; Manley, Jason; Marais, S. J.; Martens, A.; Merry, Bruce; Millenaar, Rob; Mnyandu, N.; Moeng, I. P. T.; Mokone, O. J.; Monama, T. E.; Mphego, M. C.; New, Wesley; Ngcebetsha, B.; Ngoasheng, K. J.; Ockards, M. T.; Oozeer, Nadeem; Otto, A. J.; Patel, A. A.; Peens-Hough, A.; Perkins, Simon; Ramaila, A. J. T.; Ramudzuli, Zwivhuya; Renil, Rosly; Richter, L.; Robyntjies, A.; Salie, S.; Schollar, C. T. G.; Schwardt, Ludwig; Serylak, M.; Siebrits, R.; Sirothia, S. K.; Smirnov, O.; Sofeya, L.; Stone, G.; Taljaard, B.; Tasse, C.; Theron, I.P.; Tiplady, A. J.; Toruvanda, O.; Twum, S. N.; Balla, T. J. van; Byl, A. van der; Merwe, C. van der; Tonder, V. van; Wallace, Bruce; Welz, M. G.; Williams, L. P.; Xaia, B.

doi:10.3847/1538-4357/ab5d2d

Cited by 122 publications

(84 citation statements)

References 45 publications

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“…the actual source distribution is in excess of the predictions by TGSS survey at lower flux range. Similar findings have been recently reported at a higher frequency of the 1.28 GHz MeerKAT DEEP2 Image where Mauch et al (2020) found that the model prediction lies significantly below the observed source counts at low flux range. At lower range, we find that the values of the measured C after point source subtraction decrease with increasing and shows a power-law like behaviour (at 7 http://www.physics.iisc.ernet.in/~nroy/plot_html < 700).…”

Section: Resultssupporting

confidence: 91%

All-sky angular power spectrum – I. Estimating brightness temperature fluctuations using the 150-MHz TGSS survey

Choudhuri

Ghosh

Roy

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Measurements of the Galactic synchrotron emission is relevant for the 21-cm studies from the Epoch of Reionization. The study of the synchrotron emission is also useful to quantify the fluctuations in the magnetic field and the cosmic ray electron density of the turbulent interstellar medium (ISM) of our Galaxy. Here, we present the all-sky angular power spectrum (C ) measurements of the diffuse synchrotron emission using the TIFR GMRT Sky Survey (TGSS) at 150 MHz. We estimate C using visibility data both before and after subtracting the modelled point sources. The amplitude of the measured C falls significantly after subtracting the point sources, and it is also slightly higher in the Galactic plane for the residual data. The residual C is most likely to be dominated by the Galactic synchrotron emission. The amplitude of the residual C falls significantly away from the Galactic plane. We find the measurements are quite symmetric in the Northern and Southern hemispheres except in the latitude range 15 − 30 • which is the transition region from the disk dominated to diffuse halo dominated region. The comparison between this interferometric measurement with the scaled version of the Haslam rms map at 150 MHz shows that the correlation coefficient (r) is more than 0.5 for most of the latitude ranges considered here. This signifies the TGSS survey is quite sensitive to the diffuse Galactic synchrotron radiation.

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Section: Resultssupporting

confidence: 91%

All-sky angular power spectrum – I. Estimating brightness temperature fluctuations using the 150-MHz TGSS survey

Choudhuri

Ghosh

Roy

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…MeerKAT (Jonas & MeerKAT Team 2016;Camilo et al 2018;Mauch et al 2020) is an array made of 64 13.5 m antennas located in Northern Cape, South Africa. Its spatial resolution is around 5″.…”

Section: Radio Observations With Vla and Meerkatmentioning

confidence: 99%

Relativistic X-Ray Jets from the Black Hole X-Ray Binary MAXI J1820+070

Espinasse

Corbel

Kaaret

et al. 2020

ApJL

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The black hole MAXIJ1820+070 was discovered during its 2018 outburst and was extensively monitored across the electromagnetic spectrum. Following the detection of relativistic radio jets, we obtained four Chandra X-ray observations taken between 2018 November and 2019 June, along with radio observations conducted with the Very Large Array and MeerKAT arrays. We report the discovery of X-ray sources associated with the radio jets moving at relativistic velocities with a possible deceleration at late times. The broadband spectra of the jets are consistent with synchrotron radiation from particles accelerated up to very high energies (>10 TeV) by shocks produced by the jets interacting with the interstellar medium. The minimal internal energy estimated from the X-ray observations for the jets is ∼10 41 erg, significantly larger than the energy calculated from the radio flare alone, suggesting most of the energy is possibly not radiated at small scales but released through late-time interactions. Unified Astronomy Thesaurus concepts: X-ray binary stars (1811); Relativistic jets (1390); Accretion (14); Radio jets (1347); Galactic radio sources (571); Stellar mass black holes (1611)

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“…This illustrates that an equivalent survey would not i Karoo Array Telescope. j See Mauch et al (2020) for further technical details. k For MeerKAT sensitivity calculations, see the online sensitivity calculator provided by the South African Radio Astronomy Observatory, based on real observations: https://archive-gw-1.kat.ac.za/public/tools/continuum_sensitivity_calculator.html l https://github.com/ratt-ru/simms.…”

Section: Askap and Meerkat Within The Context Of All-sky Surveysmentioning

confidence: 99%

SPT-CL J2032–5627: A new Southern double relic cluster observed with ASKAP

Duchesne

Johnston‐Hollitt

Bartalucci

et al. 2021

Publ. Astron. Soc. Aust.

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We present a radio and X-ray analysis of the galaxy cluster SPT-CL J2032–5627. Investigation of public data from the Australian Square Kilometre Array Pathfinder (ASKAP) at 943 MHz shows two previously undetected radio relics at either side of the cluster. For both relic sources, we utilise archival Australia Telescope Compact Array (ATCA) data at 5.5 GHz in conjunction with the new ASKAP data to determine that both have steep integrated radio spectra ( $\ensuremath{{\alpha_\mathrm{SE} = -1.52 \pm 0.10}}$ and $\ensuremath{{\alpha_\mathrm{NW,full} = -1.18 \pm 0.10}}$ for the southeast and northwest relic sources, respectively). No shock is seen in XMM-Newton observations; however, the southeast relic is preceded by a cold front in the X-ray–emitting intra-cluster medium. We suggest the lack of a detectable shock may be due to instrumental limitations, comparing the situation to the southeast relic in Abell 3667. We compare the relics to the population of double relic sources and find that they are located below the current power–mass scaling relation. We present an analysis of the low-surface brightness sensitivity of ASKAP and the ATCA, the excellent sensitivity of both allow the ability to find heretofore undetected diffuse sources, suggesting these low-power radio relics will become more prevalent in upcoming large-area radio surveys such as the Evolutionary Map of the Universe.

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The 1.28 GHz MeerKAT DEEP2 Image

Abstract: We present the confusion-limited 1.28 GHz MeerKAT DEEP2 image covering one q » ¢ 68 FWHM b Unified Astronomy Thesaurus concepts: Radio telescopes (1360); Galaxy counts (588); Star formation (1569)

Cited by 122 publications

References 45 publications

All-sky angular power spectrum – I. Estimating brightness temperature fluctuations using the 150-MHz TGSS survey

All-sky angular power spectrum – I. Estimating brightness temperature fluctuations using the 150-MHz TGSS survey

Relativistic X-Ray Jets from the Black Hole X-Ray Binary MAXI J1820+070

SPT-CL J2032–5627: A new Southern double relic cluster observed with ASKAP

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