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Massive stars on the verge of exploding: the properties of oxygen sequence Wolf-Rayet stars
Kaper, L.; de Mink, S. E.; de Koter, A. +7 more
Context. Oxygen sequence Wolf-Rayet (WO) stars are a very rare stage in the evolution of massive stars. Their spectra show strong emission lines of helium-burning products, in particular highly ionized carbon and oxygen. The properties of WO stars can be used to provide unique constraints on the (post-)helium burning evolution of massive stars, an…
Multi-wavelength observations of the binary system PSR B1259-63/LS 2883 around the 2014 periastron passage
Krivonos, R.; Tsygankov, S.; Tomsick, J. A. +16 more
We report on the results of the extensive multi-wavelength campaign from optical to GeV γ-rays of the 2014 periastron passage of PSR B1259-63, which is a unique high-mass γ-ray emitting binary system with a young pulsar companion. Observations demonstrate the stable nature of the post-periastron GeV flare and prove the coincidence of the flare wit…
The Destruction of the Circumstellar Ring of SN 1987A
Smith, Nathan; Garnavich, Peter; Pun, Chun S. J. +23 more
We present imaging and spectroscopic observations with Hubble Space Telescope and Very Large Telescope of the ring of SN 1987A from 1994 to 2014. After an almost exponential increase of the shocked emission from the hotspots up to day ∼8000 (∼2009), both this and the unshocked emission are now fading. From the radial positions of the hotspots we s…
On the origin of magnetosheath plasmoids and their relation to magnetosheath jets
Gunell, H.; Nilsson, H.; Hamrin, M. +4 more
We investigate localized magnetosheath and solar wind density enhancements, associated with clear magnetic field changes, and therefore referred to as magnetosheath/solar wind plasmoids, respectively. Using Cluster data, we show that there are two distinct populations of magnetosheath plasmoids, one associated with a decrease of magnetic field str…
Suzaku X-ray study of the double radio relic galaxy cluster CIZA J2242.8+5301
Kaastra, J. S.; van Weeren, R. J.; Brüggen, M. +7 more
Context. We present the results from Suzaku observations of the merging cluster of galaxies
Aims: To study the physics of gas heating and particle acceleration in cluster mergers, we investigated the X-ray emission from
Detecting dark matter substructures around the Milky Way with Gaia
Feldmann, Robert; Spolyar, Douglas
Cold dark matter (CDM) theory, a pillar of modern cosmology and astrophysics, predicts the existence of a large number of starless dark matter haloes surrounding the Milky Way (MW). However, clear observational evidence of these `dark' substructures remains elusive. Here, we present a detection method based on the small, but detectable, velocity c…
Herschel-ATLAS: the surprising diversity of dust-selected galaxies in the local submillimetre Universe
Ivison, R. J.; de Zotti, G.; Baes, M. +20 more
We present the properties of the first 250 µm blind sample of nearby galaxies (15 < D < 46 Mpc) containing 42 objects from the Herschel Astrophysical Terahertz Large Area Survey. Herschel's sensitivity probes the faint end of the dust luminosity function for the first time, spanning a range of stellar mass (7.4 < M⋆ < …
The identification of dust heating mechanisms in nearby galaxies using Herschel 160/250 and 250/350 µm surface brightness ratios
Boquien, M.; Bianchi, S.; Fritz, J. +15 more
We examined variations in the 160/250 and 250/350 µm surface brightness ratios within 24 nearby (<30 Mpc) face-on spiral galaxies observed with the Herschel Space Observatory to identify the heating mechanisms for dust emitting at these wavelengths. The analysis consisted of both qualitative and quantitative comparisons of the 160/250 and…
Does the Presence of Planets Affect the Frequency and Properties of Extrasolar Kuiper Belts? Results from the Herschel Debris and Dunes Surveys
Duchêne, G.; Eiroa, C.; Marshall, J. P. +14 more
The study of the planet-debris disk connection can shed light on the formation and evolution of planetary systems and may help “predict” the presence of planets around stars with certain disk characteristics. In preliminary analyses of subsamples of the Herschel DEBRIS and DUNES surveys, Wyatt et al. and Marshall et al. identified a tentative corr…
The Comptonization of accretion disc X-ray emission: consequences for X-ray reflection and the geometry of AGN coronae
Gallo, L. C.; Wilkins, D. R.
We consider the Comptonization of the photons that make up the relativistically blurred reflection that is commonly detected from the accretion discs of active galactic nuclei by the coronae of energetic particles believed to give rise to the powerful X-ray continua by the inverse-Compton scattering of thermal seed photons from the disc. Recent me…