Search Publications
A discrete chemo-dynamical model of the giant elliptical galaxy NGC 5846: dark matter fraction, internal rotation, and velocity anisotropy out to six effective radii
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean +7 more
We construct a suite of discrete chemo-dynamical models of the giant elliptical galaxy NGC 5846. These models are a powerful tool to constrain both the mass distribution and internal dynamics of multiple tracer populations. We use Jeans models to simultaneously fit stellar kinematics within the effective radius Re, planetary nebula (PN)…
A complete census of Herschel-detected infrared sources within the HST Frontier Fields
Smail, I.; Kneib, J. -P.; Lutz, D. +16 more
We present a complete census of all Herschel-detected sources within the six massive lensing clusters of the HST Frontier Fields (HFF). We provide a robust legacy catalogue of 263 sources with Herschel fluxes, primarily based on imaging from the Herschel Lensing Survey and PEP/HerMES Key Programmes. We optimally combine Herschel, Spitzer and WISE …
Strong constraints on a super-Eddington accretion flow: XMM-Newton observations of an intermediate-mass black hole
Done, Chris; Ward, Martin; Jin, Chichuan
RX J1140.1+0307 is a Narrow Line Seyfert 1 (NLS1) with one of the lowest black hole masses known in an AGN (M ≤ 106 M⊙). We show results from two new XMM-Newton observations, exhibiting soft 2-10 keV spectra, a strong excess at lower energies, and fast X-ray variability which is typical of this class of AGN. The soft excess c…
Magnetic field pile-up and draping at intermediately active comets: results from comet 67P/Churyumov-Gerasimenko at 2.0 AU
Glassmeier, K. -H.; Goetz, C.; Richter, I. +2 more
The interaction between a comet and the impinging solar wind leads to modifications of the magnetic field in the environment of a comet. Among those, one finds magnetic field pile-up and draping, which reveal properties of the interaction and are known from previous cometary spacecraft missions. This work studies the magnetic field configuration a…
Evidence for magnetic field compression in shocks within the jet of V404 Cyg
Covino, S.; Russell, D. M.; Fender, R. P. +3 more
We present optical and near-IR linear polarimetry of V404 Cyg during its 2015 outburst and in quiescence. We obtained time-resolved r'-band polarimetry when the source was in outburst, near-IR polarimetry when the source was near quiescence and multiple waveband optical polarimetry later in quiescence. The optical-to-near-IR linear pola…
Free-free and H42α emission from the dusty starburst within NGC 4945 as observed by ALMA
Dickinson, C.; Bendo, G. J.; Karim, A. +3 more
We present observations of the 85.69 GHz continuum emission and H42α line emission from the central 30 arcsec within NGC 4945. Both sources of emission originate from nearly identical structures that can be modelled as exponential discs with scalelengths of ∼2.1 arcsec (or ∼40 pc). An analysis of the spectral energy distribution based on combining…
Galaxy Zoo: Mergers - Dynamical models of interacting galaxies
Keel, William C.; Parrish, Michael; Smith, Arfon M. +6 more
The dynamical history of most merging galaxies is not well understood. Correlations between galaxy interaction and star formation have been found in previous studies, but require the context of the physical history of merging systems for full insight into the processes that lead to enhanced star formation. We present the results of simulations tha…
H-ATLAS: a candidate high redshift cluster/protocluster of star-forming galaxies
Pérez-Fournon, I.; Valtchanov, I.; Ivison, R. J. +33 more
We investigate the region around the Planck-detected z = 3.26 gravitationally lensed galaxy HATLAS J114637.9-001132 (hereinafter HATLAS12-00) using both archival Herschel data from the H-ATLAS survey and using submm data obtained with both LABOCA and SCUBA2. The lensed source is found to be surrounded by a strong overdensity of both Herschel-SPIRE…
Gas outflow and dust transport of comet 67P/Churyumov-Gerasimenko
Bertaux, Jean-Loup; Da Deppo, Vania; Naletto, Giampiero +46 more
Because of the diurnal thermal cycle and the irregular shape of the nucleus, gas outflow of comet 67P/Churyumov-Gerasimenko could be highly anisotropic as indicated by the colliminated dust jet structures on the sunlit side. Based on the OSIRIS imaging observations of the outgassing effect, a simple model of surface sublimation can be constructed …
A possible Chandra and Hubble Space Telescope detection of extragalactic WHIM towards PG 1116+215
Bonamente, M.; Tempel, E.; Nevalainen, J. +4 more
We have analysed Chandra low energy transmission grating and XMM-Newton Reflection Grating Spectrometer (RGS) spectra towards the z = 0.177 quasar PG 1116+215, a sightline that is rendered particularly interesting by the Hubble Space Telescope (HST) detection of several O VI and H I broad Lyman α absorption (BLA) lines that may be associated with …