Tsutsui 2007 redshift dependent time lag-luminosity relation

主要内容:
Gave a revised relation including redshift. It looks better.

This implies that the GRB evolves with redshift.

精彩摘抄:
the original relation
revised relation


文章信息:

arXiv:0710.5864 [ps, pdf, other]

Title: Redshift Dependent Lag-Luminosity Relation in 565 BASTE Gamma Ray Bursts

Authors: Ryo Tsutsui, Takashi Nakamura, Daisuke Yonetoku, Toshio Murakami, Sachiko Tanabe, Yoshiki Kodama

Subjects: Astrophysics (astro-ph)

We compared redshifts $z_Y$ from Yonetoku relation and $z_{lag}$ from the lag-luminosity relation for 565 BASTE GRBs and were surprised to find that the correlation is very low. Assuming that the luminosity is a function of both $z_Y$ and the intrinsic spectral lag $\tau_{lag}$, we found a new redshift dependent lag-luminosity relation as $L=7.5\times 10^{50}{\rm erg/s}(1+z)^{2.53}\tau_{lag}^{-0.282}$ with the correlation coefficient of 0.77 and the chance probability of $7.9\times 10^{-75}$. To check the validity of this method, we examined the other luminosity indicator, Amati relation, using $z_Y$ and the observed fluence and found the correlation coefficient of 0.92 and the chance probability of $5.2\times 10^{-106}$. Although the spectral lag is computed from two channels of BATSE, our new lag-luminosity relation suggests that a possible lag-luminosity relation in the \swift era should also depend on redshift.