Bimodal distribution of the autocorrelation function in gamma-ray bursts

被引:32
作者
Borgonovo, L [1 ]
机构
[1] Stockholm Observ, S-10691 Stockholm, Sweden
来源
ASTRONOMY & ASTROPHYSICS | 2004年 / 418卷 / 02期
关键词
gamma rays : bursts; gamma rays : observations; methods : data analysis; cosmology : distance scale;
D O I
10.1051/0004-6361:20034567
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Autocorrelation functions (ACFs) are studied for a sample of 16 long gamma-ray bursts (GRBs) with known redshift z, that were observed by the BATSE and Konus experiments. When corrected for cosmic time dilation, the ACF shows a bimodal distribution. A narrow width class (11 bursts) has at half-maximum a mean width tau'(0) = 1.6 s with a relative dispersion of similar to32%, while a broad width class (5 bursts) has tau'(0) = 7.5 s with a similar to4% dispersion. The separation between the two mean values is highly significant (>7sigma). This temporal property could be used on the large existing database of GRBs with unknown redshift. The broad width set shows a very good linear correlation between width at half-maximum and (1+z), with a correlation coefficient R = 0.995 and a probability of chance alignment <0.0004. The potential application of this correlation to cosmology studies is discussed, using it in combination with recently proposed luminosity indicators.
引用
收藏
页码:487 / 493
页数:7
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