Search Publications
SILC: a new Planck internal linear combination CMB temperature map using directional wavelets
Leistedt, Boris; Peiris, Hiranya V.; Pontzen, Andrew +2 more
We present new clean maps of the cosmic microwave background (CMB) temperature anisotropies (as measured by Planck) constructed with a novel internal linear combination (ILC) algorithm using directional, scale-discretized wavelets - scale-discretized, directional wavelet ILC or Scale-discretised, directional wavelet Internal Linear Combination (SI…
How unusual is the cool-core radio halo cluster CL1821+643?
Kale, Ruta; Parekh, Viral
Massive galaxy clusters with cool cores typically host diffuse radio sources called mini-haloes, whereas, those with non-cool cores host radio haloes. We attempt to understand the unusual nature of the cool-core galaxy cluster CL1821+643, which hosts a megaparsec-scale radio halo, using new radio observations and morphological analysis of its intr…
Multi-wavelength properties of IGR J05007-7047 (LXP 38.55) and identification as a Be X-ray binary pulsar in the LMC
Haberl, F.; Udalski, A.; Sturm, R. +2 more
We report on the results of a ∼40-d multi-wavelength monitoring of the Be X-ray binary system IGR J05007-7047 (LXP 38.55). During that period the system was monitored in the X-rays using the Swift telescope and in the optical with multiple instruments. When the X-ray luminosity exceeded 1036 erg s-1 we triggered an XMM-Newton…
The size and shape of the Milky Way disc and halo from M-type brown dwarfs in the BoRG survey
Trenti, M.; Bouwens, R. J.; Holwerda, B. W. +3 more
We have identified 274 M-type brown dwarfs in the Hubble Space Telescope's Wide Field Camera 3 pure parallel fields from the Brightest of Reionizing Galaxies (BoRG) survey for high-redshift galaxies. These are near-infrared observations with multiple lines of sight out of our Milky Way. Using these observed M-type brown dwarfs, we fitted a Galacti…
Estimating sizes of faint, distant galaxies in the submillimetre regime
Karim, A.; Hodge, J. A.; Coppin, K. +8 more
We measure the sizes of redshift ∼2 star-forming galaxies by stacking data from the Atacama Large Millimeter/submillimeter Array (ALMA). We use a uv-stacking algorithm in combination with model fitting in the uv-domain and show that this allows for robust measures of the sizes of marginally resolved sources. The analysis is primarily based on the …
GAMA/H-ATLAS: common star formation rate indicators and their dependence on galaxy physical parameters
Wang, L.; Cooray, A.; Ibar, E. +30 more
We compare common star formation rate (SFR) indicators in the local Universe in the Galaxy and Mass Assembly (GAMA) equatorial fields (∼160 deg2), using ultraviolet (UV) photometry from GALEX, far-infrared and sub-millimetre (sub-mm) photometry from Herschel Astrophysical Terahertz Large Area Survey, and Hα spectroscopy from the GAMA su…
Starbursts and dusty tori in distant 3CR radio galaxies
Barthel, Peter; Drouart, Guillaume; Podigachoski, Pece +2 more
We present a study of the complete ultraviolet to submillimetre spectral energy distributions (SEDs) of 12 3CR radio galaxy hosts in the redshift range 1.0 < z < 2.5, which were all detected in the far-infrared by the Herschel Space Observatory. The study employs the new spectro-chemical evolutionary code PÉGASE.3, in combination with recent…
High spatial resolution optical imaging of the multiple T Tauri system Lk Hα 262/Lk Hα 263
Rebolo, R.; Labadie, L.; Velasco, S. +12 more
We report high spatial resolution I' band imaging of the multiple T Tauri system LkHα 262/LkHα 263 obtained during the first commissioning period of the Adaptive Optics Lucky Imager (AOLI) at the 4.2-m William Herschel Telescope, using its Lucky Imaging mode. AOLI images have provided photometry for each of the two components LkHα 263 A and B (0.4…
Collisional excitation of doubly and triply deuterated ammonia ND2H and ND3 by H2
Roueff, E.; Lis, D. C.; Daniel, F. +6 more
The availability of collisional rate coefficients is a prerequisite for an accurate interpretation of astrophysical observations, since the observed media often harbour densities where molecules are populated under non-local thermodynamic equilibrium conditions. In the current study, we present calculations of rate coefficients suitable to describ…
X-ray emission from the Wolf-Rayet bubble NGC 6888 - II. XMM-Newton EPIC observations
Gruendl, R. A.; Chu, Y. -H.; Guerrero, M. A. +3 more
We present deep XMM-Newton European Photon Imaging Camera observations of the Wolf-Rayet (WR) bubble NGC 6888 around the star WR 136. The complete X-ray mapping of the nebula confirms the distribution of the hot gas in three maxima spatially associated with the caps and north-west blowout hinted at by previous Chandra observations. The global X-ra…