Suzaku detection of superhard X-ray emission from the classical Nova V2491 Cygni. Takei, D., Tsujimoto, M., Kitamoto, S., Ness, J., U., Drake, J., J., Takahashi, H., & Mukai, K. Astrophysical Journal, 697(1 PART 2):L54-L57, 5, 2009. ![Suzaku detection of superhard X-ray emission from the classical Nova V2491 Cygni [link]](https://bibbase.org/img/filetypes/link.svg "link")
Website abstract bibtex We report the detection of superhard (>10 keV) X-ray emission extending up to 70 keV from the classical nova V2491 Cygni using the Suzaku observatory. We conducted two 20 ks target-of-opportunity observations 9 and 29 days after the outburst on 2008 April 11, yielding wide energy range spectra by combining the X-ray Imaging Spectrometer and the Hard X-ray Detector. On day 9, a spectrum was obtained at 1.0-70 keV with the Fe XXV Kα line feature and a very flat continuum, which is explained by thermal plasma with a 3 keV temperature and power-law emission with a photon index of 0.1 attenuated by a heavy extinction of 1.4 × 1023 cm-2. The 15-70 keV luminosity at 10.5 kpc is 6 × 1035 erg s-1. The superhard emission was not present on day 29. This is the highest energy at which X-rays have been detected from a classical nova. We argue a nonthermal origin for the emission, which suggests the presence of accelerated charged particles in the nova explosion. © 2009. The American Astronomical Society. All rights reserved.
@article{
title = {Suzaku detection of superhard X-ray emission from the classical Nova V2491 Cygni},
type = {article},
year = {2009},
identifiers = {[object Object]},
keywords = {Novae, cataclysmic variables,Stars: individual (Nova Cygni 2008 number 2, V2491,X-rays: stars},
pages = {L54-L57},
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month = {5},
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abstract = {We report the detection of superhard (>10 keV) X-ray emission extending up to 70 keV from the classical nova V2491 Cygni using the Suzaku observatory. We conducted two 20 ks target-of-opportunity observations 9 and 29 days after the outburst on 2008 April 11, yielding wide energy range spectra by combining the X-ray Imaging Spectrometer and the Hard X-ray Detector. On day 9, a spectrum was obtained at 1.0-70 keV with the Fe XXV Kα line feature and a very flat continuum, which is explained by thermal plasma with a 3 keV temperature and power-law emission with a photon index of 0.1 attenuated by a heavy extinction of 1.4 × 1023 cm-2. The 15-70 keV luminosity at 10.5 kpc is 6 × 1035 erg s-1. The superhard emission was not present on day 29. This is the highest energy at which X-rays have been detected from a classical nova. We argue a nonthermal origin for the emission, which suggests the presence of accelerated charged particles in the nova explosion. © 2009. The American Astronomical Society. All rights reserved.},
bibtype = {article},
author = {Takei, D. and Tsujimoto, M. and Kitamoto, S. and Ness, J. U. and Drake, J. J. and Takahashi, H. and Mukai, K.},
journal = {Astrophysical Journal},
number = {1 PART 2}
}
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