Physics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526..404s&link_type=abstract
GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 404-408 (2000).
Physics
Gamma-Ray Sources, Gamma-Ray Bursts, Magnitudes And Colors, Luminosities, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies
Scientific paper
The galactic environment of Gamma Ray Bursts can provide good evidence about the nature of the progenitor system, with two old arguments implying that the burst host galaxies are significantly subluminous. New data and new analysis has now reversed this picture: (A) Even though the first two known host galaxies are indeed greatly subluminous, the next eight hosts have absolute magnitudes typical for a population of field galaxies. A detailed analysis of the 16 known hosts (ten with red shifts) shows them to be consistent with a Schechter luminosity function with R*=-21.8+/-1.0, as expected for normal galaxies. (B) Bright bursts from the Interplanetary Network are typically 18 times brighter than the faint bursts with red shifts, however the bright bursts do not have galaxies inside their error boxes to limits deeper than expected based on the luminosities for the two samples being identical. A new solution to this dilemma is that a broad burst luminosity function along with a burst number density varying as the star formation rate will require the average luminosity of the bright sample (>6×1058 ph.s-1 or >1052 erg.s-1) to be much greater than the average luminosity of the faint sample (~1058 ph.s-1 or ~6×1051 erg.s-1). This places the bright bursts at distances for which normal host galaxies will not violate the observed limits. In conclusion, all current evidence points to GRB host galaxies being normal in luminosity. .
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