45 citations · 153 across the 10 of their papers we have counts for
13 papers
A search for radio emission from exoplanets around evolved stars
Eamon O'Gorman, Colm P. Coughlan, Wouter Vlemmings +4
The majority of searches for radio emission from exoplanets have to date focused on short period planets, i.e., the so-called hot Jupiter type planets. However, these planets are l…
A LOFAR detection of the low mass young star T Tau at 149 MHz
Colm P. Coughlan, Rachael E. Ainsworth, Jochen Eislöffel +15
Radio observations of young stellar objects (YSOs) enable the study of ionised plasma outflows from young protostars via their free-free radiation. Previous studies of the low-mass…
High resolution VLBI polarisation imaging of AGN with the Maximum Entropy Method
Colm P. Coughlan, Denise C. Gabuzda
Radio polarisation images of the jets of Active Galactic Nuclei (AGN) can provide a deep insight into the launching and collimation mechanisms of relativistic jets. However, even a…
A GMRT survey of regions towards the Taurus Molecular Cloud at 323 and 608 MHz
Rachael E. Ainsworth, Colm P. Coughlan, David A. Green +2
We present observations of three active sites of star formation in the Taurus Molecular Cloud complex taken at 323 and 608 MHz (90 and 50 cm, respectively) with the Giant Metrewave…
Dominance of outflowing electric currents on decaparsec to kiloparsec scales in extragalactic jets
Dimitris M. Christodoulou, Denise C. Gabuzda, Sebastian Knuettel +3
Helical magnetic fields embedded in the jets of active galactic nuclei (AGNs) are required by the broad range of theoretical models that advocate for electromagnetic launching of t…
GMRT detections of low mass young stars at 323 and 608 MHz
Rachael E. Ainsworth, Anna M. M. Scaife, David A. Green +2
We present the results of a pathfinder project conducted with the Giant Metrewave Radio Telescope (GMRT) to investigate protostellar systems at low radio frequencies. The goal of t…
Imaging VLBI polarimetry data from Active Galactic Nuclei using the Maximum Entropy Method
Colm P. Coughlan, Denise C. Gabuzda
Mapping the relativistic jets emanating from AGN requires the use of a deconvolution algorithm to account for the effects of missing baseline spacings. The CLEAN algorithm is the m…
Investigating the effects of finite resolution on observed transverse Rotation Measure distributions
Eoin Murphy, Colm Coughlan, Denise Gabuzda
Both the emission properties and evolution of Active Galactic Nuclei (AGN) radio jets are dependent on the magnetic (B) fields that thread them. Faraday Rotation measurements are a…
Describing the Uncertainties in VLBI Images
Colm P. Coughlan, Denise C. Gabuzda
We are investigating a new approach to modelling uncertainties in individual pixels of Very Long Baseline Interferometry (VLBI) intensity (Stokes I, Q, U) images. Comparison of dis…
MEM imaging of multi-wavelength VLBA polarisation observations of Active Galactic Nuclei
Colm P. Coughlan, Denise C. Gabzuda
We have developed a C++ implementation of the Maximum Entropy Method (MEM) suitable for deconvolving VLBI polarisation data. The first results of this implementation are presented…
Connecting Magnetic Towers with Faraday Rotation Gradients in Active Galactic Nuclei Jets
Mehreen Mahmud, Colm P. Coughlan, Eoin Murphy +2
The idea that systematic Faraday Rotation gradients across the parsec-scale jets of AGNs can reveal the presence of helical magnetic (B) fields has been around since the early 1990…
MEM and CLEAN Imaging of VLBA Polarisation Observations of Compact Active Galactic Nuclei
Colm Coughlan, Denise Gabuzda
The Maximum Entropy Method (MEM) for the deconvolution of radio interferometry images is mathematically well based and presents a number of advantages over the usual CLEAN deconvol…
First results from 18-22cm VLBA polarisation observations of the MOJAVE-I AGNs
Colm Coughlan, Ronan Murphy, Kyle Mc Enery +3
We are in the process of obtaining VLBA polarisation data for the 135 MOJAVE-I Active Galactic Nuclei at four wavelengths in the 18-22cm band. These observations will enable studie…