Search Publications
An astrophysical interpretation of the remarkable g-mode frequency groups of the rapidly rotating γ Dor star, KIC 5608334
Li, Gang; Bedding, Timothy R.; Antoci, Victoria +5 more
The Fourier spectrum of the γ-Dor variable KIC 5608334 shows remarkable frequency groups at ∼3, ∼6, ∼9, and 11-12 d-1. We explain the four frequency groups as prograde sectoral g modes in a rapidly rotating star. Frequencies of intermediate-to-high radial order prograde sectoral g modes in a rapidly rotating star are proportional to |m|…
An INTEGRAL overview of High-Mass X-ray Binaries: classes or transitions?
Sidoli, L.; Paizis, A.
We analysed in a systematic way the public INTEGRAL observations spanning from December 2002 to September 2016, to investigate the hard X-ray properties of about 60 High Mass X-ray Binaries (HMXBs). We considered both persistent and transient sources, hosting either a Be star (Be/XRBs) or a blue supergiant companion (SgHMXBs, including Supergiant …
A catalogue of clusters of galaxies identified from all sky surveys of 2MASS, WISE, and SuperCOSMOS
Han, J. L.; Wen, Z. L.; Yang, F.
We identify 47 600 clusters of galaxies from photometric data of Two Micron All Sky Survey (2MASS), Wide-field Infrared Survey Explorer (WISE), and SuperCOSMOS, among which 26 125 clusters are recognized for the first time and mostly in the sky outside the Sloan Digital Sky Survey (SDSS) area. About 90 per cent of massive clusters of M500
Massive 70 µm quiet clumps - II. Non-thermal motions driven by gravity in massive star formation?
Peretto, N.; Billot, N.; Fuller, G. A. +5 more
The dynamic activity in massive star-forming regions prior to the formation of bright protostars is still not fully investigated. In this work, we present observations of HCO+ J = 1-0 and N2H+ J = 1-0 made with the IRAM 30 m telescope towards a sample of 16 Herschel-identified massive 70 µm quiet clumps assoc…
SHARP - V. Modelling gravitationally lensed radio arcs imaged with global VLBI observations
Vegetti, S.; McKean, J. P.; Auger, M. W. +4 more
We present milliarcsecond (mas) angular resolution observations of the gravitationally lensed radio source MG J0751+2716 (at z= 3.2) obtained with global very long baseline interferometry (VLBI) at 1.65 GHz. The background object is highly resolved in the tangential and radial directions, showing evidence of both compact and extended structure acr…
Kinetic Theory and Fast Wind Observations of the Electron Strahl
Wilson, Lynn B., III; Horaites, Konstantinos; Viñas, Adolfo F. +2 more
We develop a model for the strahl population in the solar wind - a narrow, low-density and high-energy electron beam centred on the magnetic field direction. Our model is based on the solution of the electron drift-kinetic equation at heliospheric distances where the plasma density, temperature and the magnetic field strength decline as power laws…
A sextet of clusters in the Vela OB2 region revealed by Gaia
Wright, Nicholas J.; Boffin, Henri M. J.; Jerabkova, Tereza +5 more
Using Gaia DR2 data, combined with OmegaCAM ground-based optical photometry from the Accretion Disc with OmegaCAM survey, and detailed radial velocity measurements from ESO-Gaia, we analyse in detail a 10 × 5 deg region around the Wolf-Rayet Star γ2 Vel, including the previously known clusters Gamma Vel and NGC2547. Using clustering ana…
A potential progenitor for the Type Ic supernova 2017ein
Kilpatrick, Charles D.; Foley, Ryan J.; Pan, Yen-Chen +9 more
We report the first detection of a credible progenitor system for a Type Ic supernova (SN Ic), SN 2017ein. We present spectra and photometry of the SN, finding it to be similar to carbon-rich, low-luminosity SNe Ic. Using a post-explosion Keck adaptive optics image, we precisely determine the position of SN 2017ein in pre-explosion HST images, fin…
On the far-infrared metallicity diagnostics: applications to high-redshift galaxies
Marques-Chaves, R.; Magdis, G. E.; Cooray, A. +5 more
In an earlier paper we modelled the far-infrared emission from a star-forming galaxy using the photoionization code CLOUDY and presented metallicity sensitive diagnostics based on far-infrared fine structure line ratios. Here, we focus on the applicability of the [O III] 88 µm/[N II] 122 µm line ratio as a gas-phase metallicity indicat…
WISE J080822.18-644357.3 - a 45 Myr-old accreting M dwarf hosting a primordial disc
Murphy, Simon J.; Mamajek, Eric E.; Bell, Cameron P. M.
WISE J080822.18-644357.3 (WISE J0808-6443) was recently identified as a new M dwarf debris disc system and a candidate member of the 45 Myr-old Carina association. Given that the strength of its infrared excess (LIR/L⋆ ≃ 0.1) appears to be more consistent with a young protoplanetary disc, we present the first optical spectra …