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

We report the detection of super-hard (>10 keV) X-ray emission extending upto 70 keV from the classical nova V2491 Cygni using the Suzaku observatory. Weconducted two ~20 ks target-of-opportunity observations 9 and 29 days after theoutburst on 2008 April 11, yielding wide energy range spectra by combining theX-ray Imaging Spectrometer and the Hard X-ray Detector. On day 9, a spectrumwas obtained at 1.0-70 keV with the Fe XXV K\alpha line feature and a very flatcontinuum, which is explained by thermal plasma with a 3 keV temperature andpower-law emission with a photon index of 0.1 attenuated by a heavy extinctionof 1.4x10^{23} cm^{-2}. The 15-70 keV luminosity at 10.5 kpc is 6x10^{35} ergss^{-1}. The super-hard emission was not present on day 29. This is the highestenergy at which X-rays have been detected from a classical nova. We argue anon-thermal origin for the emission, which suggests the presence of acceleratedcharged particles in the nova explosion.

Suzaku Detection of Super-hard X-ray Emission from the Classical Nova V2491 Cygni