Hard X-ray emission from Eta Carinae
Jean-Christophe Leyder, Roland Walter, and Gregor Rauw

TL;DR
This study detects and analyzes the hard X-ray emission from Eta Carinae, confirming inverse Compton processes in colliding-wind binaries and providing the first isolated spectrum of Eta Car in this energy range.
Contribution
It unambiguously isolates Eta Carinae's hard X-ray emission and confirms its spectral characteristics, supporting inverse Compton emission models in colliding-wind binaries.
Findings
Eta Car's hard X-ray spectrum is very hard with photon index around 1.
The luminosity of Eta Car in 22-100 keV range is approximately 7×10^33 erg/s.
The emission aligns with inverse Compton model predictions, representing about 0.1% of wind collision energy.
Abstract
Context : If relativistic particle acceleration takes place in colliding-wind binaries, hard X-rays and gamma-rays are expected through inverse Compton emission, but to date these have never been unambiguously detected. Aims : To detect this emission, observations of Eta Carinae were performed with INTEGRAL, leveraging its high spatial resolution. Methods : Deep hard X-ray images of the region of Eta Car were constructed in several energy bands. Results : 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 (photon index around 1) and its luminosity is 7E33 erg/s. Conclusions : The observed emission is in agreement with the…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsAstrophysical Phenomena and Observations · Gamma-ray bursts and supernovae · Astrophysics and Cosmic Phenomena
