Open AccessRedshift‐dependent lag–luminosity relation in 565 BATSE gamma‐ray bursts
Author(s) -
Tsutsui Ryo,
Nakamura Takashi,
Yonetoku Daisuke,
Murakami Toshio,
Tanabe Sachiko,
Kodama Yoshiki
Publication year - 2008
Publication title -
monthly notices of the royal astronomical society: letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.067
H-Index - 122
eISSN - 1745-3933
pISSN - 1745-3925
DOI - 10.1111/j.1745-3933.2008.00455.x
Subject(s) - redshift , astrophysics , physics , lag , luminosity , gamma ray burst , lag time , luminosity function , galaxy , computer science , computer network , biological system , biology
We compared redshifts z Y measured from the Yonetoku relation and z lag from the lag–luminosity relation for 565 BATSE gamma‐ray bursts (GRBs) and were surprised to find that the correlation between these two redshifts is very low. Assuming that the luminosity is a function of both z Y and the intrinsic spectral lag τ lag , we found a new redshift‐dependent lag–luminosity relation L = 7.5 × 10 50 erg s −1 (1 + z ) 2.53 τ −0.282 lag with the correlation coefficient of 0.77 and the chance probability of 7.9 × 10 −75 . Although the spectral lag is computed from two channels of the Burst and Transient Source Experiment (BATSE), our new lag–luminosity relation suggests that a future lag–luminosity relation defined in the Swift data should also depend on the redshift.