The 1.28 GHz MeerKAT Galactic Center Mosaic

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The inner $\sim 200$ pc region of the Galaxy contains a 4 million $M_\odot$ supermassive black hole (SMBH), significant quantities of molecular gas, and star formation and cosmic-ray energy densities that are roughly two orders of magnitude…

Primary beam effects of radio astronomy antennas – II. Modelling MeerKAT L-band beams

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After a decade of design and construction, South Africa’s SKA-MID precursor MeerKAT has begun its science operations. To make full use of the widefield capability of the array, it is imperative that we have an accurate model of the primary…

Constraining the intergalactic medium at z ≈ 9.1 using LOFAR Epoch of Reionization observations

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We derive constraints on the thermal and ionization states of the intergalactic medium (IGM) at redshift $\approx 9.1$ using new upper limits on the 21-cm power spectrum measured by the LOFAR radio telescope and a prior on the ionized fraction…

Improved upper limits on the 21 cm signal power spectrum of neutral hydrogen at z ≈ 9.1 from LOFAR

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A new upper limit on the 21 cm signal power spectrum at a redshift of $z \approx 9.1$ is presented, based on 141 h of data obtained with the Low-Frequency Array (LOFAR). The analysis includes significant improvements in spectrally smooth…

The 1.28 GHz MeerKAT DEEP2 Image

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We present the confusion-limited 1.28 GHz MeerKAT DEEP2 image covering one $\theta_b\approx 68'$ FWHM primary-beam area with $\theta=7.6^{''}$ FWHM resolution and $\sigma_n=0.55\pm 0.01$ $\mu$Jy beam$^{-1}$ rms noise. Its J2000 center position…