Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97...59f&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 59-62.
Astronomy and Astrophysics
Astronomy
96
Cosmology, Gamma Ray Astronomy, Gamma Ray Bursts, Photons, Astronomical Spectroscopy, Emission Spectra, Photosphere, Relativistic Particles
Scientific paper
Recent BATSE results indicate that gamma-ray bursts may be at cosmological distances. We have investigated two models of relativistic flows that could provide the requisite beaming to allow the escape of 100 MeV photons: a stationary relativistic wind with a photosphere and a relativistic expanding shell. For typical cosmological gamma-ray burst parameters, the expanding shell model requires a Lorentz factor (gamma) of only 100 compared to 300 to 1000 for the relativistic wind. For the expanding shell model, events separated in time at the central source produce peaks observed to be separated by the same time. However, the shape and duration of the peaks are determined by the expansion. The expansion can occur over a much longer time (by gamma squared) than the duration that the observer sees, so the photosphere of the gamma-ray burst could be larger than 100 light-seconds.
Epstein Irving R.
Fenimore Edward E.
Ho Cheng
No associations
LandOfFree
The escape of 100 MeV photons from cosmological gamma-ray bursts 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 The escape of 100 MeV photons from cosmological gamma-ray bursts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The escape of 100 MeV photons from cosmological gamma-ray bursts will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1771794