کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1766472 1020150 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A possible redshift evolution of the time-lag and variability luminosity relations for long gamma-ray bursts
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
A possible redshift evolution of the time-lag and variability luminosity relations for long gamma-ray bursts
چکیده انگلیسی
The data we use are taken from Schaefer's literature (Schaefer et al., 2007) in which 69 long gamma-ray bursts were analyzed. The method consists of binning the data by redshift interval, then writing the time-lag relation in the form log(L)=A+Blog[τlag/(1+z)] and extracting the fit parameters A and B for each redshift bin; likewise, for the variability relation, which we write in the form log(L)=A+Blog[V(1+z)]. The objective is then to see whether the fitting parameters A and B evolve in any systematic way with the redshift. Our analysis indicates that both the A and B parameters do evolve with z in a systematic way for the lag-relation but not for the variability relation. A flat universe with ΩM=0.3,ΩΛ=0.7, and H0=70kms-1Mpc-1 is assumed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 44, Issue 11, 1 December 2009, Pages 1354-1358
نویسندگان
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