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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

If relativistic particle acceleration takes place in colliding-wind binaries, hard X-rays and γ-rays are expected through inverse Compton scattering of the copious UV radiation, but they had never been unambiguously detected. To detect this emission, observations performed with INTEGRAL were carefully analysed, taking advantage of the high spatial resolution of this satellite with respect to previous γ-ray missions. In particular, deep hard X-ray images of the region of Eta Carinae were constructed in several energy bands, leading to the very first detection of this source at energies up to 100 keV. The hard X-ray emission previously detected by BeppoSax around Eta Car originates from at least 3 different point sources. The emission of Eta Car itself can be isolated for the first time, and its spectrum unambiguously analyzed. The X-ray emission of Eta Car in the 22–100 keV energy range is very hard (with a photon index Γ around 1), and its luminosity is 7× 1033 erg/s. The observed emission is in agreement with the predictions of inverse Compton models, and corresponds to about 0.1% of the energy available in the wind collision. A systematic search for hard X-ray emission from other colliding-wind binaries and from massive stars is also being performed using the INTEGRAL data archive, and the first results are presented.

Hard X-ray emission from Eta Carinae & other colliding-wind binaries