2009ApJ...697L..54T


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.06CEST11:55:38

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

Status at CDS:  

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NOVA Vel 1999 No* 10 44 48.39 -52 25 30.7           ~ 167 0
2 V* RS Oph No* 17 50 13.1592776879 -06 42 28.481553668   12.29 4.30     OB+M2ep 918 0
3 NOVA Aql 1999 No* 19 07 36.90 +12 31 26.2           ~ 65 0
4 NOVA Cyg 2008 b No* 19 43 01.9773145314 +32 19 13.545320806 18.27 18.72 18.03 17.72 17.41 ~ 135 0
5 NOVA Cyg 2006 No* 21 11 32.346 +44 48 03.66   10.5 8.5     ~ 90 1
6 NAME Galactic Ridge ? ~ ~           ~ 420 1

    Equat.    Gal    SGal    Ecl

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2020.04.06-11:55:38

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