SIMBAD references

2009ApJ...697L..54T - Astrophys. J., 697, L54-L57 (2009/May-3)

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. and MUKAI K.

Abstract (from CDS):

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 1.4x1023/cm2. The 15-70 keV luminosity at 10.5 kpc is 6x1035 erg/s. 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.

Abstract Copyright:

Journal keyword(s): novae, cataclysmic variables - stars: individual (Nova Cygni 2008 number 2 = V2491 Cygni,) - X-rays: stars

Simbad objects: 6

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2020.02.27-13:04:04

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