Search Publications
Precise strong lensing mass profile of the CLASH galaxy cluster MACS 2129
Zitrin, A.; Grillo, C.; Balestra, I. +12 more
We present a detailed strong lensing (SL) mass reconstruction of the core of the galaxy cluster MACS J2129.4-0741 (zcl = 0.589) obtained by combining high-resolution Hubble Space Telescope photometry from the CLASH (Cluster Lensing And Supernovae survey with Hubble) survey with new spectroscopic observations from the CLASH-VLT (Very Lar…
Effective ion speeds at ∼200-250 km from comet 67P/Churyumov-Gerasimenko near perihelion
Nilsson, H.; André, M.; Goetz, C. +13 more
In 2015 August, comet 67P/Churyumov-Gerasimenko, the target comet of the ESA Rosetta mission, reached its perihelion at ∼1.24 au. Here, we estimate for a three-day period near perihelion, effective ion speeds at distances ∼200-250 km from the nucleus. We utilize two different methods combining measurements from the Rosetta Plasma Consortium (RPC)/…
A WISE-based search for debris discs amongst M dwarfs in nearby, young, moving groups
Jeffries, R. D.; Binks, A. S.
We present a search for debris discs amongst M-dwarf members of nearby, young (5-150 Myr) moving groups (MGs) using infrared (IR) photometry, primarily from the Wide Infrared Survey Explorer (WISE). A catalogue of 100 MG M dwarfs that have suitable WISE data is compiled, and 19 of these are found to have significant IR excess emission at 22 µ…
Distance biases in the estimation of the physical properties of Hi-GAL compact sources - I. Clump properties and the identification of high-mass star-forming candidates
Benedettini, M.; Elia, D.; Pezzuto, S. +8 more
The degradation of spatial resolution in star-forming regions, observed at large distances (d ≳ 1 kpc) with Herschel, can lead to estimates of the physical parameters of the detected compact sources (clumps), which do not necessarily mirror the properties of the original population of cores. This paper aims at quantifying the bias introduced in th…
Polarization and long-term variability of Sgr A* X-ray echo
Sunyaev, R.; Churazov, E.; Ponti, G. +1 more
We use a model of the molecular gas distribution within ∼100 pc from the centre of the Milky Way (Kruijssen, Dale & Longmore) to simulate time evolution and polarization properties of the reflected X-ray emission, associated with the past outbursts from Sgr A*. While this model is too simple to describe the complexity of the true gas distribut…
Spectral and timing properties of IGR J00291+5934 during its 2015 outburst
Sanna, A.; Egron, E.; Ferrigno, C. +8 more
We report on the spectral and timing properties of the accreting millisecond X-ray pulsar IGR J00291+5934 observed by XMM-Newton and NuSTAR during its 2015 outburst. The source is in a hard state dominated at high energies by a Comptonization of soft photons (∼0.9 keV) by an electron population with kTe ∼ 30 keV, and at lower energies b…
NGC 1566: analysis of the nuclear region from optical and near-infrared Integral Field Unit spectroscopy
Steiner, J. E.; Menezes, R. B.; da Silva, Patrícia
We analysed the centre of NGC 1566, which hosts a well-studied active galactic nucleus (AGN), known for its variability. With the aid of techniques such as Principal Component Analysis Tomography, analysis of the emission-line spectra, channel maps, Penalized Pixel Fitting and spectral synthesis applied to the optical and near-infrared data cubes,…
KiDS-450: tomographic cross-correlation of galaxy shear with Planck lensing
Hoekstra, Henk; Heymans, Catherine; Merten, Julian +15 more
We present the tomographic cross-correlation between galaxy lensing measured in the Kilo Degree Survey (KiDS-450) with overlapping lensing measurements of the cosmic microwave background (CMB), as detected by Planck 2015. We compare our joint probe measurement to the theoretical expectation for a flat Λ cold dark matter cosmology, assuming the bes…
Evolution of the magnetic field at comet 67P/Churyumov-Gerasimenko
Goetz, Charlotte; Richter, Ingo; Volwerk, Martin +1 more
The magnetic field at a comet is significantly influenced by the solar wind on one side and the outgassing rate on the other. There are no simple spatial models for the magnetic field direction, neither at a comet with low outgassing rates (∼1025 s-1) where ion gyroradius effects are non-negligible, nor at high outgassing rat…
The eMERGE Survey - I: Very Large Array 5.5 GHz observations of the GOODS-North Field
Guidetti, D.; Bondi, M.; Prandoni, I. +8 more
We present new observations of the GOODS-N field obtained at 5.5 GHz with the Karl G. Jansky Very Large Array. The central region of the field was imaged to a median rms of 3 µJy beam-1 with a resolution of 0.5 arcsec. From a 14-arcmin diameter region, we extracted a sample of 94 radio sources with signal-to-noise ratio greater th…