Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...490..109s&link_type=abstract
Astrophysical Journal v.490, p.109
Astronomy and Astrophysics
Astronomy
6
Galaxies: Clusters: General, Gamma Rays: Bursts, Radiation Mechanisms: Nonthermal
Scientific paper
A likelihood statistic constructed from positions and positional uncertainties identifies 82 associations of BATSE sources with rich, concentrated Abell clusters. Random simulations indicate that 42 +/- 9 of these pairs are chance associations. Among the approximately 40 physically associated cluster-gamma-ray burst (GRB) pairs (the nearest containing the Coma Cluster and GRB 2193), we find (1) a plateau between 15.8 and 16.2 mag in the integral (observed-minus-random) number distribution of mR(10), the magnitude of 10th brightest cluster member, which may indicate the presence of two burst populations with different characterstic intrinsic luminosities; (2) the dispersion in GRB fluences between 100 and 300 keV (represented as apparent magnitude, m[100-300 keV]) is smaller for bursts paired with mR(10) <= 16.2 clusters than for those with mR(10) > 16.2; (3) the average 100-300 keV isotropic intrinsic energy of GRBs associated with mR(10) <= 16.2 clusters with known redshift z < 0.07 (10 clusters including Coma) is ~=3.4 +/- 2.3 x 1049 ergs; (4) the apparent luminosity of these 10 GRBs is anticorrelated with burst duration, t90 (Spearman rank correlation coefficient of 0.87, nonzero at between 99% and 99.9% confidence level); and (5) the absolute luminosity, L1024, of these 10 GRBs is more strongly anticorrelated with t90 (Spearman rank correlation coefficient of 0.93, nonzero at >99.9% confidence level). The slope of this relation indicates t90~L^{-1}1024 . These results suggest that the anticorrelation of apparent burst magnitude with duration is an intrinsic property of the bursts and is not caused by cosmological time dilation.
Rood Herbert J.
Struble Mitchell F.
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