Search Publications
First evidence of external disc photoevaporation in a low mass star forming region: the case of IM Lup
Cleeves, L. Ilsedore; Facchini, Stefano; Clarke, Cathie J. +1 more
We model the radiatively driven flow from IM Lup - a large protoplanetary disc expected to be irradiated by only a weak external radiation field (at least 104 times lower than the ultraviolet field irradiating the Orion Nebula Cluster proplyds). We find that material at large radii (>400 au) in this disc is sufficiently weakly gravit…
Herschel far-infrared photometry of the Swift Burst Alert Telescope active galactic nuclei sample of the local universe - III. Global star-forming properties and the lack of a connection to nuclear activity
Mushotzky, Richard F.; Cowie, Lennox L.; Barger, Amy J. +3 more
We combine the Herschel Space Observatory PACS (Photoconductor Array Camera and Spectrometer) and SPIRE (Spectral and Photometric Imaging Receiver) photometry with archival WISE (Wide-field Infrared Survey Explorer) photometry to construct the spectral energy distributions (SEDs) for over 300 local (z < 0.05), ultrahard X-ray (14-195 keV) selec…
QUIJOTE scientific results - II. Polarisation measurements of the microwave emission in the Galactic molecular complexes W43 and W47 and supernova remnant W44
Lasenby, A.; Martínez-González, E.; Rebolo, R. +11 more
We present Q-U-I JOint TEnerife (QUIJOTE) intensity and polarisation maps at 10-20 GHz covering a region along the Galactic plane 24° ≲ l ≲ 45°, |b| ≲ 8°. These maps result from 210 h of data, have a sensitivity in polarisation of ≈40 µK beam-1 and an angular resolution of ≈1°. Our intensity data are crucial to confirm the presenc…
The Gaia DR1 mass-radius relation for white dwarfs
Gänsicke, B. T.; Jordan, S.; Tremblay, P. -E. +9 more
The Gaia Data Release 1 (DR1) sample of white dwarf parallaxes is presented, including six directly observed degenerates and 46 white dwarfs in wide binaries. This data set is combined with spectroscopic atmospheric parameters to study the white dwarf mass-radius relationship (MRR). Gaia parallaxes and G magnitudes are used to derive model atmosph…
The HST large programme on ω Centauri - I. Multiple stellar populations at the bottom of the main sequence probed in NIR-Optical
Apai, D.; Anderson, J.; Milone, A. P. +7 more
As part of a large investigation with Hubble Space Telescope to study the faintest stars within the globular cluster ω Centauri, in this work we present early results on the multiplicity of its main sequence (MS) stars, based on deep optical and near-infrared observations. By using appropriate colour-magnitude diagrams, we have identified, for the…
Comparative analysis of Debrecen sunspot catalogues
Ludmány, A.; Baranyi, T.; Győri, L.
Sunspot area data are important for studying solar activity and its long-term variations. At the Debrecen Heliophysical Observatory, we compiled three sunspot catalogues: the Debrecen Photoheliographic Data (DPD), the SDO/HMI Debrecen Data (HMIDD) and the SOHO/MDI Debrecen Data. For comparison, we also compiled an additional sunspot catalogue, the…
Revealing the ultrafast outflow in IRAS 13224-3809 through spectral variability
Fabian, A. C.; Reynolds, C. S.; Pinto, C. +6 more
We present an analysis of the long-term X-ray variability of the extreme narrow-line Seyfert 1 galaxy IRAS 13224-3809 using principal component analysis (PCA) and fractional excess variability (Fvar) spectra to identify model-independent spectral components. We identify a series of variability peaks in both the first PCA component and F…
Nature of the absorbing gas associated with a galaxy group at z∼0.4
Pettini, Max; York, Donald G.; Husemann, Bernd +6 more
We present new Multi Unit Spectroscopic Explorer observations of quasar field Q2131-1207 with a log N(H I} = 19.50 ± 0.15 sub-damped Lyman α at zabs = 0.42980. We detect four galaxies at a redshift consistent with that of the absorber where only one was known before this study. Two of these are star-forming galaxies, while the ones furt…
The metallicity of the intracluster medium over cosmic time: further evidence for early enrichment
Allen, Steven W.; Simionescu, Aurora; Werner, Norbert +4 more
We use Chandra X-ray data to measure the metallicity of the intracluster medium (ICM) in 245 massive galaxy clusters selected from X-ray and Sunyaev-Zel'dovich (SZ) effect surveys, spanning redshifts 0 < z < 1.2. Metallicities were measured in three different radial ranges, spanning cluster cores through their outskirts. We explore trends in…
The Galaxy End Sequence
Smith, Matthew W. L.; Eales, Stephen; Ciesla, Laure +4 more
A common assumption is that galaxies fall in two distinct regions of a plot of specific star formation rate (SSFR) versus galaxy stellar mass: a star-forming galaxy main sequence (GMS) and a separate region of 'passive' or 'red and dead galaxies'. Starting from a volume-limited sample of nearby galaxies designed to contain most of the stellar mass…