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arXiv 0710.5864astro-ph
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565个BASTE伽马射线暴的红移相关的滞后-光度关系

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

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

摘要:

我们比较了565个BASTE伽玛暴的由Yonetoku关系得到的红移$z_Y$和由滞后光度关系得到的红移$z_{lag}$,惊奇地发现它们的相关性很低。假设光度是$z_Y$和内禀光谱滞后$τ_{lag}$的函数,我们得到了一个新的红移相关的滞后-光度关系式$L=7.5\times 10^{50}{\rm erg/s}(1+z)^{2.53}τ_{lag}^{-0.282}$,其相关系数为0.77,机会概率为$7.9\times 10^{-75}$ .为了验证该方法的有效性,我们用$z_Y$和观测到的注量检验了另一个光度指标Amati关系,发现相关系数为0.92,并得到了$5.2\times 10^{-106}$的机会概率。虽然光谱滞后是从BATSE的两个通道计算的,我们的新的滞后光度关系表明,一个可能的滞后光度关系在\swift时代也应该取决于红移。

英文摘要:

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 $τ_{lag}$, we found a new redshift dependent lag-luminosity relation as $L=7.5\times 10^{50}{\rm erg/s}(1+z)^{2.53}τ_{lag}^{-0.282}$ 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.

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