Search Publications
The density structure of the L1157 molecular outflow
Podio, L.; Codella, C.; Ceccarelli, C. +6 more
We present a multiline CS survey towards the brightest bow-shock B1 in the prototypical chemically active protostellar outflow L1157. We made use of (sub-)mm data obtained in the framework of the Chemical HErschel Surveys of Star forming regions and Astrochemical Surveys at IRAM (ASAI) key science programs. We detected 12C32S…
A Compton-thick AGN in the barred spiral galaxy NGC 4785
Gandhi, P.; Asmus, D.; Yamada, S. +5 more
We present X-ray observations of the active galactic nucleus (AGN) in NGC 4785. The source is a local Seyfert 2 which has not been studied so far in much detail. It was recently detected with high significance in the 15-60 keV band in the 66-month Swift/BAT (Burst Array Telescope) all sky survey, but there have been no prior pointed X-ray observat…
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…