654 citations · 3.4k across the 55 of their papers we have counts for
55 papers
Spectral age distribution for radio-loud active galaxies in the XMM-LSS field
Siddhant Pinjarkar, Martin J. Hardcastle, Jeremy J. Harwood +5
Jets of energetic particles, as seen in FR type-I and FR type-II sources, ejected from the center of Radio-Loud AGN affect the sources surrounding intracluster medium/intergalactic…
The Host Galaxies of Hybrid Morphology Radio Sources
Andra Stroe, Victoria Catlett, Jeremy J. Harwood +2
Based on their differing radio morphologies, powerful radio galaxies can be separated into the Fanaroff-Riley I (FR-I) and II (FR-II) classes. Hybrid morphology radio sources (HyMo…
Subarcsecond view on the high-redshift blazar GB 1508+5714 by the International LOFAR Telescope
A. Kappes, P. R. Burd, M. Kadler +14
Studies of the most distant AGNs allow us to test our current understanding of the physics present in radio-jetted AGNs across a range of environments. The decrease in apparent lum…
Investigating the spectra and physical nature of galaxy scale jets
B. Webster, J. H. Croston, J. J. Harwood +4
Previous studies have shown that physically small, low-luminosity radio galaxies, which we refer to as galaxy scale jets (GSJ), could potentially have a significant effect upon the…
Spectral analysis of spatially-resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope
Etienne Bonnassieux, Frits Sweijen, Marisa Brienza +11
3C295 is a bright, compact steep spectrum source with a well-studied integrated radio spectral energy distribution (SED) from 132 MHz to 15 GHz. However, spatially resolved spectra…
High-resolution international LOFAR observations of 4C~43.15 -- Spectral ages and injection indices in a high-z radio galaxy
Frits Sweijen, Leah K. Morabito, Jeremy Harwood +6
Radio sources with steep spectra are preferentially associated with the most distant galaxies, the relation, but the reason for this relation is an open question. The spatial…
The resolved jet of 3C 273 at 150 MHz
Jeremy J. Harwood, Sean Mooney, Leah K. Morabito +6
Since its discovery in 1963, 3C273 has become one of the most widely studied quasars with investigations spanning the electromagnetic spectrum. While much has been discovered about…
Sub-arcsecond imaging with the International LOFAR Telescope: II. Completion of the LOFAR Long-Baseline Calibrator Survey
Neal Jackson, Shruti Badole, John Morgan +69
The Low-Frequency Array (LOFAR) Long-Baseline Calibrator Survey (LBCS) was conducted between 2014 and 2019 in order to obtain a set of suitable calibrators for the LOFAR array. In…
Constraining the AGN duty cycle in the cool-core cluster MS 0735.6+7421 with LOFAR data
Nadia Biava, Marisa Brienza, Annalisa Bonafede +6
MS 0735.6+7421 is a galaxy cluster which hosts a central radio galaxy with a very steep spectrum, produced by one of the most powerful known jetted active galactic nuclei (AGN). Th…
Raining in MKW 3s: a Chandra-MUSE analysis of X-ray cold filaments around 3CR 318.1
A. Jimenez-Gallardo, F. Massaro, B. Balmaverde +23
We present the analysis of X-ray and optical observations of gas filaments observed in the radio source 3CR 318.1, associated with NGC 5920, the Brightest Cluster Galaxy (BCG) of M…
A low frequency study of linear polarization in radio galaxies
Vijay H. Mahatma, Martin J. Hardcastle, Jeremy Harwood +4
Radio galaxies are linearly polarized -- an important property that allows us to infer the properties of the magnetic field of the source and its environment. However at low freque…
Radio spectral properties and jet duty cycle in the restarted radio galaxy 3C388
M. Brienza, R. Morganti, J. Harwood +9
Restarted radio galaxies represent a unique tool to investigate the duty cycle of the jet activity in Active Galactic Nuclei. Due to a sharp discontinuity of the GHz spectral index…
Low-frequency observations of the Giant Radio Galaxy NGC 6251
T. M. Cantwell, J. D. Bray, J. H. Croston +22
We present LOFAR observations at 150 MHz of the borderline FRI/FRII giant radio galaxy NGC 6251. This paper presents the most sensitive and highest-resolution images of NGC 6251 at…
High-resolution VLA Imaging of Obscured Quasars: Young Radio Jets Caught in a Dense ISM
Pallavi Patil, Kristina Nyland, Mark Whittle +12
We present new sub-arcsecond-resolution Karl G. Jansky Very Large Array (VLA) imaging at 10 GHz of 155 ultra-luminous () and heavily obscured…
The LOFAR view of NGC 3998, a sputtering AGN
Sarrvesh S. Sridhar, Raffaella Morganti, Kristina Nyland +3
Low-power radio sources dominate the radio sky. They tend to be small in size and core-dominated, but the origin of their properties and the evolution of their radio plasma are not…
Investigating the spectral age problem with powerful radio galaxies
Vijay H. Mahatma, Martin J. Hardcastle, Judith H. Croston +3
The 'spectral age problem' is our systematic inability to reconcile the maximum cooling time of radiating electrons in the lobes of a radio galaxy with its age as modelled by the d…
Unveiling the cause of hybrid morphology radio sources (HyMoRS)
Jeremy J. Harwood, Tessa Vernstrom, Andra Stroe
Hybrid morphology radio sources (HyMoRS) are a rare group of radio galaxies in which differing Fanaroff & Riley morphologies (FR I/II) are observed for each of the two lobes. While…
LOFAR first look at the giant radio galaxy 3C 236
A. Shulevski, P. D. Barthel, R. Morganti +8
We have examined the giant radio galaxy 3C~236 using LOFAR at 143 MHz down to an angular resolution of 7", in combination with observations at higher frequencies. We have used the…
Signatures from a merging galaxy cluster and its AGN population: LOFAR observations of Abell 1682
A. O. Clarke, A. M. M. Scaife, T. Shimwell +13
We present LOFAR data from 110--180~MHz of the merging galaxy cluster Abell 1682, alongside archival optical, radio and X-ray data. Our 6 arc-second resolution images at low freque…
The LOFAR Two-metre Sky Survey (LoTSS) III. First Data Release: optical/IR identifications and value-added catalogue
W. L. Williams, M. J. Hardcastle, P. N. Best +38
The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168 MHz survey of the Northern sky with diverse and ambitious science goals. Many of the scienti…
The LOFAR Two-metre Sky Survey - II. First data release
T. W. Shimwell, C. Tasse, M. J. Hardcastle +104
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…
The LoTSS view of radio AGN in the local Universe. The most massive galaxies are always switched on
J. Sabater, P. N. Best, M. J. Hardcastle +18
This paper presents a study of the local radio source population, by cross-comparing the data from the first data release (DR1) of the LOFAR Two-Metre Sky Survey (LoTSS) with the S…
Science with an ngVLA: Young Radio AGN in the ngVLA Era
Pallavi Patil, Kristina Nyland, Jeremy J. Harwood +2
Most massive galaxies are now thought to go through an Active Galactic Nucleus (AGN) phase one or more times. Yet, the cause of triggering and the variations in the intrinsic and o…
Science with an ngVLA: Radio Jet-ISM Feedback on Sub-galactic Scales
Kristina Nyland, Dipanjan Mukherjee, Mark Lacy +5
Energetic feedback by active galactic nuclei (AGNs) plays an important evolutionary role in the regulation of star formation (SF) on galactic scales. However, the effects of this f…