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LOFAR MSSS: Flattening low-frequency radio continuum spectra of nearby galaxies
(2018-11-07)
Aims. The shape of low-frequency radio continuum spectra of normal galaxies is not well understood, the key question being the role of physical processes such as thermal absorption in shaping them. In this work we take ...
The environments of radio-loud AGN from the LOFAR Two-Metre Sky Survey (LoTSS)
(2018-10-10)
An understanding of the relationship between radio-loud active galaxies and their large-scale environments is essential for realistic modelling of radio-galaxy evolution and environmental impact, for understanding AGN ...
The intergalactic magnetic field probed by a giant radio galaxy
(2018-10-09)
Cosmological simulations predict that an intergalactic magnetic field (IGMF) pervades the large scale structure (LSS) of the Universe. Measuring the IGMF is important to determine its origin (i.e. primordial or otherwise). ...
The LOFAR Two-metre Sky Survey - II. First data release
(2018-09-12)
The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168MHz survey of the entire northern sky for which observations are now 20% complete. We present our first full-quality public data release. ...
A catalogue of faint local radio AGN and the properties of their host galaxies
(2018-09-01)
We present a catalogue of 2210 local ( z < 0.1) galaxies that contain faint active galactic nuclei (AGN). We select these objects by identifying galaxies that exhibit a significant excess in their radio luminosities, ...
Detection of non-thermal X-ray emission in the lobes and jets of Cygnus A
(2018-08-21)
We present a spectral analysis of the lobes and X-ray jets of Cygnus A, using more than 2 Ms of $\textit{Chandra}$ observations. The X-ray jets are misaligned with the radio jets and significantly wider. We detect non-thermal ...
The origin of radio emission in broad absorption line quasars: Results from the LOFAR Two-metre Sky Survey
(2018-08-16)
We present a study of the low-frequency radio properties of broad absorption line quasars (BALQSOs) from the LOFAR Two-metre Sky-Survey Data Release 1 (LDR1). The value-added LDR1 catalogue contains Pan-STARRS counterparts, ...
The X-ray Ribs Within the Cocoon Shock of Cygnus A
(2018-06-01)
We use new and archival Chandra observations of Cygnus A, totalling ~1.9Ms, to investigate the distribution and temperature structure of gas lying within the projected extent of the cocoon shock and exhibiting a rib-like ...
Polarized point sources in the LOFAR Two-meter Sky Survey: A preliminary catalog
(2018-06-01)
The polarization properties of radio sources at very low frequencies (<200 MHz) have not been widely measured, but the new generation of low-frequency radio telescopes, including the Low Frequency Array (LOFAR: a Square ...
Particle content, radio-galaxy morphology and jet power : all radio-loud AGN are not equal
(2018-05-11)
Ongoing and future radio surveys aim to trace the evolution of black hole growth and feedback from active galactic nuclei (AGNs) throughout cosmic time; however, there remain major uncertainties in translating radio ...