Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1381..247c&link_type=abstract
25TH TEXAS SYMPOSIUM ON RELATIVISTIC ASTROPHYSICS (TEXAS 2010). AIP Conference Proceedings, Volume 1381, pp. 247-254 (2011).
Astronomy and Astrophysics
Astrophysics
Redshift, Stellar Evolution, Brightness, Jets, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Magnitudes And Colors, Luminosities, Jets And Bursts, Galactic Winds And Fountains
Scientific paper
At a redshift of 8.3 GRB 090423 marks the highest known redshift object in the Universe. By combining our radio measurements with existing X-ray and infrared observations, we estimated the kinetic energy of the afterglow, the geometry of the outflow and the density of the circumburst medium. Our best fit model is a quasi-spherical, high-energy explosion in a low, constant-density medium. We compare the properties of GRB 090423 with a sample of GRBs at moderate redshifts. We find that the high energy and afterglow properties of GRB 090423 are not sufficiently different from other GRBs to suggest a different kind of progenitor, such as a Population III star. However, we argue that it is not clear that the afterglow properties alone can provide convincing identification of Population III progenitors. We suggest that the millimeter and centimeter radio detections of GRB 090423 at early times contained emission from a reverse shock component. This has important implications for the detection of high redshift GRBs by the next generation of radio facilities.
Berger Edo
Bock Douglas C. -J.
Cenko Bradley S.
Chandra Poonam
Fox Derek
No associations
LandOfFree
The most distant cosmological explosion 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 most distant cosmological explosion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The most distant cosmological explosion will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1078763