Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.133t&link_type=abstract
Astronomy and Astrophysics Supplement, v.120, p.133-136
Astronomy and Astrophysics
Astrophysics
8
X-Rays: Stars, X-Rays: Bursts, Acceleration Of Particles, Stars: Individual: 4U 1608-52
Scientific paper
Hard X-ray emission from compact objects has been considered a spectral signature of black hole candidates. However, SIGMA and BATSE recently detected transient emission in the energy range 30-200keV from several X-ray bursters (XRBs) believed to contain weakly magnetized neutron stars. At least seven XRBs (including Aquila X-1 and 4U 1608-52) are currently known to produce erratic hard X-ray outbursts with typical durations of several weeks. These results lead us to reconsider theoretical models of high-energy emission from compact objects, and in particular thermal Comptonization models vs. non-thermal models of particle energization and X-ray emission from weakly magnetized neutron stars. We summarize here recent results for magnetic field reconnection models of non-thermal particle acceleration and high-energy emission of accretion disks. For intermediate soft X-ray luminosities below the Eddington limit, non-thermal hard X-ray emission is predicted to have a (broken) power-law spectrum with intensity anticorrelated with the soft X-ray luminosity. Recent GINGA/BATSE data for the XRB 4U 1608-52 are in agreement with the mechanism of emission proposed here: transient hard X-ray emission consistent with a broken power-law spectrum was detected for a sub-Eddington soft X-ray luminosity.
Liang Edison
Tavani Marco
No associations
LandOfFree
Hard X-ray emission from X-ray bursters. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Hard X-ray emission from X-ray bursters., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hard X-ray emission from X-ray bursters. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1145740