The VLA Frontier Fields Survey: Deep, High-resolution Radio Imaging of the MACS Lensing Clusters at 3 and 6 GHz

Heywood, Ian; Murphy, E. J.; Jiménez-Andrade, E. F.; Armus, L.; Cotton, W. D.; DeCoursey, Christa; Dickinson, Mark; Lazio, T. Joseph W.; Momjian, Emmanuel; Penner, K.; Smail, Ian; Smirnov, O.

doi:10.3847/1538-4357/abdf61

Cited by 13 publications

(6 citation statements)

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“…Finally, over smaller areas, typically 1-10 deg 2 , we find the deepest radio surveys reaching µJy sensitivities, well into the regime where regular starforming galaxies are dominating the radio source counts (e.g. Prandoni et al 2018;Matthews et al 2021), for example the deep VLA observations of the COSMOS field (Smolčić et al 2017;van der Vlugt et al 2021), the VLA Hubble Frontier Fields survey (Heywood et al 2021), the e-MERLIN e-MERGE project (Muxlow et al 2020), the LoTSS deep fields (Tasse et al 2020), and the 'DEEP2' observations (Mauch et al 2020) with the South African MeerKAT telescope (Jonas & MeerKAT Team 2016).…”

Section: Introductionmentioning

confidence: 52%

MIGHTEE: total intensity radio continuum imaging and the COSMOS/XMM-LSS Early Science fields

Heywood

Jarvis

Hale

et al. 2021

Monthly Notices of the Royal Astronomical Society

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MIGHTEE is a galaxy evolution survey using simultaneous radio continuum, spectro-polarimetry, and spectral line observations from the South African MeerKAT telescope. When complete, the survey will image ∼20 deg2 over the COSMOS, E-CDFS, ELAIS-S1, and XMM-LSS extragalactic deep fields with a central frequency of 1284 MHz. These were selected based on the extensive multiwavelength datasets from numerous existing and forthcoming observational campaigns. Here we describe and validate the data processing strategy for the total intensity continuum aspect of MIGHTEE, using a single deep pointing in COSMOS (1.6 deg2) and a three-pointing mosaic in XMM-LSS (3.5 deg2). The processing includes the correction of direction-dependent effects, and results in thermal noise levels below 2 $\mathrm{\mu }$Jy beam−1 in both fields, limited in the central regions by classical confusion at ∼8″ angular resolution, and meeting the survey specifications. We also produce images at ∼5″ resolution that are ∼3 times shallower. The resulting image products form the basis of the Early Science continuum data release for MIGHTEE. From these images we extract catalogues containing 9,896 and 20,274 radio components in COSMOS and XMM-LSS respectively. We also process a close-packed mosaic of 14 additional pointings in COSMOS and use these in conjunction with the Early Science pointing to investigate methods for primary beam correction of broadband radio images, an analysis that is of relevance to all full-band MeerKAT continuum observations, and wide field interferometric imaging in general. A public release of the MIGHTEE Early Science continuum data products accompanies this article.

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Section: Introductionmentioning

confidence: 52%

MIGHTEE: total intensity radio continuum imaging and the COSMOS/XMM-LSS Early Science fields

Heywood

Jarvis

Hale

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Section: Introductionmentioning

confidence: 70%

MIGHTEE: total intensity radio continuum imaging and the COSMOS / XMM-LSS Early Science fields

Heywood,

Jarvis,

Hale

et al. 2021

Preprint

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MIGHTEE is a galaxy evolution survey using simultaneous radio continuum, spectro-polarimetry, and spectral line observations from the South African MeerKAT telescope. When complete, the survey will image ∼20 deg 2 over the COSMOS, E-CDFS, ELAIS-S1, and XMM-LSS extragalactic deep fields with a central frequency of 1284 MHz. These were selected based on the extensive multiwavelength datasets from numerous existing and forthcoming observational campaigns. Here we describe and validate the data processing strategy for the total intensity continuum aspect of MIGHTEE, using a single deep pointing in COSMOS (1.6 deg 2 ) and a three-pointing mosaic in XMM-LSS (3.5 deg 2 ). The processing includes the correction of direction-dependent effects, and results in thermal noise levels below 2 µJy beam −1 in both fields, limited in the central regions by classical confusion at ∼8 ′′ angular resolution, and meeting the survey specifications. We also produce images at ∼5 ′′ resolution that are ∼3 times shallower. The resulting image products form the basis of the Early Science continuum data release for MIGHTEE. From these images we extract catalogues containing 9,896 and 20,274 radio components in COSMOS and XMM-LSS respectively. We also process a close-packed mosaic of 14 additional pointings in COSMOS and use these in conjunction with the Early Science pointing to investigate methods for primary beam correction of broadband radio images, an analysis that is of relevance to all full-band MeerKAT continuum observations, and wide field interferometric imaging in general. A public release of the MIGHTEE Early Science continuum data products accompanies this article.

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“…We note the relatively low intrinsic rest-frame radio luminosities of HS 0810+2554 and SDSS J1004+4112, at 𝐿 5GHz ∼ 2.4 × 10 22 W Hz −1 and 𝐿 5GHz ∼ 3 × 10 21 W Hz −1 , respectively. Both objects show strong evidence for AGN-dominated radio activity, yet both are the among the faintest known radio sources ever to be imaged (see also Heywood et al (2021)), with peak surface brightness values of just ∼0.9 and ∼2 µJy/beam, respectively . Both sources are located within the upturn at the faint end of the radio quasar luminosity function, which has previously been modelled using a star-forming population (e.g.…”

Section: Discussionmentioning

confidence: 95%

Using strong lensing to understand the microJy radio emission in two radio quiet quasars at redshift 1.7

Hartley,

Jackson,

Badole

et al. 2021

Preprint

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The radio quasar luminosity function exhibits an upturn around 𝐿 6 GHz = 10 23 W Hz −1 that is well-modelled by a star-forming host galaxy population. This distribution leads some authors to cite star formation as the main radio emission mechanism in so-called radio-quiet quasars (RQQs). Understanding the origin of RQQ radio emission is crucial for our understanding of quasar feedback mechanisms -responsible for the regulation of star-formation in the host galaxy -and for understanding galaxy evolution as a whole. By observing RQQs that have been magnified by strong gravitational lensing, we have direct access to the RQQ population out to cosmic noon, where evidence for twin mini-jets has recently been found in a sub-µJy RQQ. Here we present radio observations of two lensed RQQs using the VLA at 5 GHz, the latest objects to be observed in a sample of quadruply-imaged RQQs above -30 • . In SDSS J1004+4112 we find strong evidence for AGN-related radio emission in the variability of the source. In PG 1115+080 we find tentative evidence for AGN-related emission, determined by comparing the radio luminosity with modelled dust components. If confirmed in the case of PG 1115+080, which lies on the radio-FIR correlation, the result would reinforce the need for caution when applying the correlation to rule out jet activity and when assuming no AGN heating of FIRemitting dust when calculating star formation rates. Our programme so far has shown that two of the faintest radio sources ever imaged show strong evidence for AGN-dominated radio emission.

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The VLA Frontier Fields Survey: Deep, High-resolution Radio Imaging of the MACS Lensing Clusters at 3 and 6 GHz

Cited by 13 publications

References 50 publications

MIGHTEE: total intensity radio continuum imaging and the COSMOS/XMM-LSS Early Science fields

MIGHTEE: total intensity radio continuum imaging and the COSMOS/XMM-LSS Early Science fields

MIGHTEE: total intensity radio continuum imaging and the COSMOS / XMM-LSS Early Science fields

Using strong lensing to understand the microJy radio emission in two radio quiet quasars at redshift 1.7

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