Search Publications
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…
New bright optical spectrophotometric standards: A-type stars from the STIS Next Generation Spectral Library
del Burgo, C.; Allende Prieto, C.
Exoplanets have sparked interest in extremely high signal-to-noise ratio spectroscopic observations of very bright stars, in a regime where flux calibrators, in particular DA white dwarfs, are not available. We argue that A-type stars offer a useful alternative and reliable space-based spectrophotometry is now available for a number of bright ones…
The Agilkia boulders/pebbles size-frequency distributions: OSIRIS and ROLIS joint observations of 67P surface
Jorda, L.; Lamy, P. L.; Jaumann, R. +57 more
By using the images acquired by the OSIRIS (Optical, Spectroscopic and Infrared Remote Imaging System) and ROLIS (ROsetta Lander Imaging System) cameras, we derive the size-frequency distribution (SFD) of cometary pebbles and boulders covering the size range 0.05-30.0 m on the Agilkia landing site. The global SFD measured on OSIRIS images, reflect…
MUSE three-dimensional spectroscopy and kinematics of the gigahertz peaked spectrum radio galaxy PKS 1934-63: interaction, recently triggered active galactic nucleus and star formation
Roche, Nathan; Humphrey, Andrew; Lagos, Patricio +4 more
We observe the radio galaxy PKS 1934-63 (at z = 0.1825) using the Multi-Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT). The radio source is a gigahertz peaked spectrum source and is compact (0.13 kpc), implying an early stage of evolution (≤104 yr). Our data show an interacting pair of galaxies, with projected sepa…
The tight subgiant branch of the intermediate-age star cluster NGC 411 implies a single-aged stellar population
Bastian, N.; Niederhofer, F.; Li, C. +3 more
The presence of extended main-sequence turn-off (eMSTO) regions in intermediate-age star clusters in the Large and Small Magellanic Clouds is often interpreted as resulting from extended star formation histories (SFHs), lasting ≥300 Myr. This strongly conflicts with the traditional view of the dominant star formation mode in stellar clusters, whic…