Search Publications
Supernova progenitors, their variability and the Type IIP Supernova ASASSN-16fq in M66
Kochanek, C. S.; Stanek, K. Z.; Dong, Subo +10 more
We identify a pre-explosion counterpart to the nearby Type IIP supernova ASASSN-16fq (SN 2016cok) in archival Hubble Space Telescope data. The source appears to be a blend of several stars that prevents obtaining accurate photometry. However, with reasonable assumptions about the stellar temperature and extinction, the progenitor almost certainly …
Super-Eddington QSO RX J0439.6-5311 - I. Origin of the soft X-ray excess and structure of the inner accretion flow
Done, Chris; Ward, Martin; Jin, Chichuan
We report the results from a recent 133 ks XMM-Newton observation of a highly super-Eddington narrow-line Type-1 quasi-stellar object RX J0439.6-5311. This source has one of the steepest active galactic nuclei hard X-ray slopes, in addition to a prominent and smooth soft X-ray excess. Strong variations are found throughout the 0.3-10 keV energy ra…
CLASH: accurate photometric redshifts with 14 HST bands in massive galaxy cluster cores
Infante, L.; Zheng, W.; Molino, A. +41 more
We present accurate photometric redshifts for galaxies observed by the Cluster Lensing And Supernova survey with Hubble (CLASH). CLASH observed 25 massive galaxy cluster cores with the Hubble Space Telescope in 16 filters spanning 0.2-1.7 µm. Photometry in such crowded fields is challenging. Compared to our previously released catalogues, we…
The JCMT Plane Survey: first complete data release - emission maps and compact source catalogue
Martin, P. G.; White, G. J.; Moore, T. J. T. +42 more
We present the first data release of the James Clerk Maxwell Telescope Plane Survey (JPS), the JPS Public Release 1. JPS is an 850-µm continuum survey of six fields in the northern inner Galactic plane in a longitude range of ℓ = 7°-63°, made with the Submillimetre Common-User Bolometer Array 2. This first data release consists of emission m…
Observational consequences of optical band milliarcsec-scale structure in active galactic nuclei discovered by Gaia
Petrov, L.; Kovalev, Y. Y.
We interpret the recent discovery of a preferred very long baseline interferometry (VLBI)/Gaia offset direction for radio-loud active galactic nuclei (AGNs) along pc-scale radio jets as a manifestation of their optical structure on scales of 1-100 milliarcsec (mas). The extended jet structure affects the Gaia position more strongly than the VLBI p…
The Lyman continuum escape and ISM properties in Tololo 1247-232 - new insights from HST and VLA★
Östlin, G.; Hayes, M.; Zackrisson, E. +7 more
Low- and intermediate-mass galaxies are widely discussed as cause of reionization at redshift z ∼ 10-6. However, observational proof of galaxies that are leaking ionizing radiation (Lyman continuum; LyC) is a currently ongoing challenge and the list of LyC emitting candidates is still short. Tololo 1247-232 is among those very few galaxies with re…
A detection of wobbling brightest cluster galaxies within massive galaxy clusters
Kneib, J. P.; Harvey, David; Courbin, F. +1 more
A striking signal of dark matter beyond the standard model is the existence of cores in the centre of galaxy clusters. Recent simulations predict that a brightest cluster galaxy (BCG) inside a cored galaxy cluster will exhibit residual wobbling due to previous major mergers, long after the relaxation of the overall cluster. This phenomenon is abse…
The Clouds are breaking: tracing the Magellanic system with Gaia DR1 Mira variables
Erkal, Denis; Belokurov, Vasily; Mackey, Dougal +2 more
We exploit the first data release from the Gaia mission to identify candidate Mira variables in the outskirts of the Magellanic Clouds. The repeated observations of sources during the initial phase of the Gaia mission is used to identify stars that show signs of variability. This variability information, combined with infrared photometry from Two …
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: angular clustering tomography and its cosmological implications
Brownstein, Joel R.; Thomas, Daniel; Prada, Francisco +17 more
We investigate the cosmological implications of studying galaxy clustering using a tomographic approach applied to the final Baryon Oscillation Spectroscopic Survey (BOSS) DR12 galaxy sample, including both auto- and cross-correlation functions between redshift shells. We model the signal of the full shape of the angular correlation function, ω(θ)…
Imprint of DES superstructures on the cosmic microwave background
Benoit-Lévy, A.; Bacon, D.; D'Andrea, C. B. +61 more
Small temperature anisotropies in the cosmic microwave background (CMB) can be sourced by density perturbations via the late-time integrated Sachs-Wolfe (ISW) effect. Large voids and superclusters are excellent environments to make a localized measurement of this tiny imprint. In some cases excess signals have been reported. We probed these claims…