English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We analyze new high-resolution Chandra X-ray images of the Wolf-Rayet binarysystem WR147. This system contains a WN8 star with an early-type companionlocated 0.6'' to its north, and is the only known early-type binary with aseparation on the sky large enough for the wind-wind collision between thestars to currently be resolved at X-ray energies. The 5 ksec Chandra HRC-Iimage provides the first direct evidence for spatially extended X-ray emissionin an early-type binary system. The X-ray emission peaks close to the positionof the radio bow shock and north of the WN8 star. A deeper X-ray image isneeded to accurately determine the degree of spatial extension, to exactlyalign the X-ray and optical/radio frames, and to determine whether part of thedetected X-ray emission arises in the individual stellar winds. Simulated X-rayimages of the wind-wind collision have a FWHM consistent with the data, andmaximum likelihood fits suggest that a deeper observation may also constrainthe inclination and wind momentum ratio of this system. However, as the WR winddominates the colliding wind X-ray emission it appears unlikely that themass-loss rate and the terminal velocity of the companion wind can beseparately determined from X-ray observations. We also note an inconsistencybetween numerical and analytical estimates of the X-ray luminosity ratio of thestronger and weaker wind components, and conclude that the analytical resultsare in error.Comment: 13 pages, 6 figures, accepted by A&

High-resolution X-ray imaging of the colliding wind shock in WR 147