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Isothermal dust models of Herschel-ATLAS galaxies
(2013-12)
We use galaxies from the Herschel-ATLAS (H-ATLAS) survey, and a suite of ancillary simulations based on an isothermal dust model, to study our ability to determine the effective dust temperature, luminosity and emissivity ...
Particle acceleration and dynamics of double-double radio galaxies : Theory versus observations
(2013-12-01)
In this paper, we showthat a small sample of radio galaxies with evidence for multiple epochs of jet activity (so-called double-double radio galaxies) have the same electron injection spectral index in the two activity ...
Spectral ageing in the lobes of FR-II radio galaxies : New methods of analysis for broad-band radio data
(2013-11-01)
The broad-bandwidth capabilities of next generation telescopes such as the Jansky Very Large Array (JVLA) mean that the spectrum of any given source varies significantly within the bandwidth of any given observation. ...
Mass entrainment and turbulence-driven acceleration of ultra-high energy cosmic rays in Centaurus A
(2013-10)
Observations of the FR I radio galaxy Centaurus A in radio, X-ray, and gamma-ray bands provide evidence for lepton acceleration up to several TeV and clues about hadron acceleration to tens of EeV. Synthesising the available ...
A 325-MHz GMRT survey of the Herschel-ATLAS/GAMA fields
(2013-10-01)
We describe a 325-MHz survey, undertaken with the Giant Metrewave Radio Telescope (GMRT), which covers a large part of the three equatorial fields at 9, 12 and 14.5 h of right ascension from the Herschel-Astrophysical ...
The fading of two transient ultraluminous x-ray sources to below the stellar mass Eddington limit
(2013-09-20)
We report new detections of the two transient ultraluminous X-ray sources (ULXs) in NGC 5128 from an ongoing series of Chandra observations. Both sources have previously been observed L (2-3) × ∼10 erg s, at the lower end ...
Synchrotron and inverse-Compton emission from radio galaxies with non-uniform magnetic field and electron distributions
(2013-08)
I investigate the effect of non-uniform magnetic fields in the extended structures of radio galaxies on the observed synchrotron and inverse-Compton emission. On the assumption of an isotropic field, with a given power ...
Herschel-ATLAS/GAMA : the environmental density of far-infrared bright galaxies at z < 0.5
(2013-07)
We compare the environmental and star formation properties of far-infrared detected and non-far-infrared detected galaxies out to z similar to 0.5. Using optical spectroscopy and photometry from the Galaxy And Mass Assembly ...
Radio-Loud Active Galactic Nucleus : is there a link between luminosity and cluster environment?
(2013-06-20)
We present here the first results from the Chandra ERA (Environments of Radio-loud AGN) Large Project, characterizing the cluster environments of a sample of 26 radio-loud active galactic nuclei (AGNs) at z similar to 0.5 ...
Herschel-ATLAS/GAMA: What determines the far-infrared properties of radio galaxies?
(2013-06)
We perform a stacking analysis of Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) data in order to obtain isothermal dust temperatures and rest-frame luminosities at 250 mu m (L-250), for a well-defined sample ...