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Evolving optical polarisation of the black hole X-ray binary MAXI J1820+070
Piirola, Vilppu; Tsygankov, Sergey S.; Poutanen, Juri +8 more
Aims: The optical emission of black hole transients increases by several magnitudes during the X-ray outbursts. Whether the extra light arises from the X-ray heated outer disc, from the inner hot accretion flow, or from the jet is currently debated. Optical polarisation measurements are able to distinguish the relative contributions of these …
The O star hinterland of the Galactic starburst, NGC 3603
Monguió, M.; Wright, N. J.; Drew, J. E.
The very bright and compact massive young cluster, NGC 3603, has been cited as an example of a starburst in the Milky Way and compared with the much-studied R136/30 Doradus region in the Large Magellanic Cloud. Here we build on the discovery by Mohr-Smith et al. of a large number of reddened O stars around this cluster. We construct a list of 288 …
A joint XMM-NuSTAR observation of the galaxy cluster Abell 523: Constraints on inverse Compton emission
Brunetti, G.; Rossetti, M.; Wik, D. R. +17 more
Aims: We present the results of a joint XMM-Newton and NuSTAR observation (200 ks) of the galaxy cluster Abell 523 at z = 0.104. The peculiar morphology of the cluster radio halo and its outlier position in the radio power P(1.4 GHz) - X-ray luminosity plane make it an ideal candidate for the study of radio and X-ray correlations and for the …
Active Galactic Nuclei with Ultrafast Outflows Monitoring Project: The Broad-line Region of Mrk 79 as a Disk Wind
Ho, Luis C.; Bian, Wei-Hao; Kim, Minjin +23 more
We developed a spectroscopic monitoring project to investigate the kinematics of the broad-line region (BLR) in active galactic nuclei (AGNs) with ultrafast outflows (UFOs). Mrk 79 is a radio-quiet AGN with UFOs and warm absorbers and has been monitored by three reverberation mapping (RM) campaigns, but its BLR kinematics are not yet understood. I…
Observations of a Footpoint Drift of an Erupting Flux Rope
Aulanier, Guillaume; Dudík, Jaroslav; Gömöry, Peter +2 more
We analyze the imaging observations of an M-class eruptive flare of 2015 November 4. The pre-eruptive Hα filament was modeled by the nonlinear force-free field model, which showed that it consisted of two helical systems. Tether-cutting reconnection involving these two systems led to the formation of a hot sigmoidal loop structure rooted in a smal…
Tracking the variable jets of V404 Cygni during its 2015 outburst
Altamirano, D.; Bremer, M.; Russell, D. M. +14 more
We present multifrequency monitoring observations of the black hole X-ray binary V404 Cygni throughout its 2015 June outburst. Our data set includes radio and mm/sub-mm photometry, taken with the Karl G. Jansky Very Large Array, Arc-Minute MicroKelvin Imager Large Array, Sub-millimeter Array, James Clerk Maxwell Telescope, and the Northern Extende…
CHANG-ES. XIX. Galaxy NGC 4013: a diffusion-dominated radio halo with plane-parallel disk and vertical halo magnetic fields
Weżgowiec, M.; Dettmar, R. -J.; Beck, R. +9 more
Context. The radio continuum halos of edge-on spiral galaxies have diverse morphologies, with different magnetic field properties and cosmic ray (CR) transport processes into the halo.
Aims: Using the Continuum HAloes in Nearby Galaxies - an EVLA Survey (CHANG-ES) radio continuum data from the Karl G. Jansky Very Large Array (VLA) in two freq…
Albedos, Equilibrium Temperatures, and Surface Temperatures of Habitable Planets
Del Genio, Anthony D.; Guzewich, Scott D.; Way, Michael J. +8 more
The potential habitability of known exoplanets is often categorized by a nominal equilibrium temperature assuming a Bond albedo of either ∼0.3, similar to Earth, or 0. As an indicator of habitability, this leaves much to be desired, because albedos of other planets can be very different, and because surface temperature exceeds equilibrium temperat…
Revisiting the pulsational characteristics of the exoplanet host star β Pictoris
Reese, D. R.; Handler, G.; Wade, G. A. +21 more
Context. Exoplanet properties crucially depend on the parameters of their host stars: more accurate stellar parameters yield more accurate exoplanet characteristics. When the exoplanet host star shows pulsations, asteroseismology can be used for an improved description of the stellar parameters.
Aims: We aim to revisit the pulsational propert…
Observations of a pre-merger shock in colliding clusters of galaxies
Gu, Liyi; Mao, Junjie; Kaastra, Jelle S. +10 more
Clusters of galaxies are the largest known gravitationally bound structures in the Universe. When clusters collide, they create merger shocks on cosmological scales, which transform most of the kinetic energy carried by the cluster gaseous halos into heat1-3. Observations of merger shocks provide key information on the merger dynamics, …