Search Publications
The JCMT Gould Belt Survey: evidence for radiative heating in Serpens MWC 297 and its influence on local star formation
Stapelfeldt, K. R.; White, G. J.; Wilson, C. D. +61 more
We present SCUBA-2 450 and 850 µm observations of the Serpens MWC 297 region, part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey of nearby star-forming regions. Simulations suggest that radiative feedback influences the star formation process and we investigate observational evidence for this by constructing temperature maps.…
HSIM: a simulation pipeline for the HARMONI integral field spectrograph on the European ELT
Swinbank, A. M.; Fusco, T.; Kendrew, S. +5 more
We present HSIM: a dedicated pipeline for simulating observations with the High Angular Resolution Monolithic Optical and Near-infrared Integral field spectrograph (HARMONI) on the European Extremely Large Telescope. HSIM takes high spectral and spatial resolution input data cubes, encoding physical descriptions of astrophysical sources, and gener…
The growth index of matter perturbations using the clustering of dark energy
Basilakos, Spyros
We have put forward a new unified framework which provides a consistent and rather complete account of the growth index of matter perturbations in the regime where the dark energy is allowed to have clustering. In particular, we find that the growth index is not only affected by the cosmological parameters but rather it depends on the choice of th…
Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +219 more
The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the HESS Collaboration to perform deep observations of this field of view. This resulted in the discovery of the new very high energy (VHE) source HESS J1832-093, at the position {RA=18^h 32^m 50^s ± 3^s_{stat} ± 2^s_{syst}}, {Dec=-9*deg;22'36" ± 32"}_{…
Bias in C IV-based quasar black hole mass scaling relationships from reverberation mapped samples
Shang, Zhaohui; Brotherton, Michael S.; DiPompeo, M. A. +1 more
The masses of the black holes powering quasars represent a fundamental parameter of active galaxies. Estimates of quasar black hole masses using single-epoch spectra are quite uncertain, and require quantitative improvement. We recently identified a correction for C IV λ1549-based scaling relationships used to estimate quasar black hole masses tha…
Swift follow-up of IceCube triggers, and implications for the Advanced-LIGO era
Smith, M.; Kowalski, M.; Gehrels, N. +11 more
Between 2011 March and 2014 August Swift responded to 20 triggers from the IceCube neutrino observatory, observing the IceCube 50 per cent confidence error circle in X-rays, typically within 5 h of the trigger. No confirmed counterpart has been detected. We describe the Swift follow-up strategy and data analysis and present the results of the camp…
Decaying dark matter: the case for a deep X-ray observation of Draco
Lovell, Mark R.; Bertone, Gianfranco; Boyarsky, Alexey +2 more
Recent studies of M31, the Galactic Centre (GC), and galaxy clusters have made tentative detections of an X-ray line at ∼3.5 keV that could be produced by decaying dark matter. We use high-resolution simulations of the Aquarius project to predict the likely amplitude of the X-ray decay flux observed in the GC relative to that observed in M31, and …
A multiwavelength exploration of the [C II]/IR ratio in H-ATLAS/GAMA galaxies out to z = 0.2
Valtchanov, I.; Ivison, R. J.; Smith, M. +23 more
We explore the behaviour of [C II] λ157.74 µm forbidden fine-structure line observed in a sample of 28 galaxies selected from ∼ 50 deg2 of the Herschel-Astrophysical Terahertz Large Area Survey survey. The sample is restricted to galaxies with flux densities higher than S160 µm > 150 mJy and optical spectra fro…
The SLUGGS survey: multipopulation dynamical modelling of the elliptical galaxy NGC 1407 from stars and globular clusters
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +7 more
We perform in-depth dynamical modelling of the luminous and dark matter (DM) content of the elliptical galaxy NGC 1407. Our strategy consists of solving the spherical Jeans equations for three independent dynamical tracers: stars, blue globular clusters (GCs) and red GCs in a self-consistent manner. We adopt a maximum-likelihood Markov Chain Monte…
Testing the inversion of asteroids' Gaia photometry combined with ground-based observations
Tanga, P.; Cellino, A.; Bartczak, P. +2 more
We investigated the reliability of the genetic algorithm which will be used to invert the photometric measurements of asteroids collected by the European Space Agency Gaia mission. To do that, we performed several sets of simulations for 10 000 asteroids having different spin axis orientations, rotational periods and shapes. The observational epoc…