LUMINOSITY DISTRIBUTION OF GAMMA-RAY BURST HOST GALAXIES AT REDSHIFT z = 1 IN COSMOLOGICAL SMOOTHED PARTICLE HYDRODYNAMIC SIMULATIONS: IMPLICATIONS FOR THE METALLICITY DEPENDENCE OF GRBs
LUMINOSITY DISTRIBUTION OF GAMMA-RAY BURST HOST GALAXIES AT REDSHIFT z = 1 IN COSMOLOGICAL SMOOTHED PARTICLE HYDRODYNAMIC SIMULATIONS: IMPLICATIONS FOR THE METALLICITY DEPENDENCE OF GRBs
复制标题
DOI：
10.1088/0004-637x/726/2/88
复制
发表时间：
2010-06
期刊：
影响因子：
--
通讯作者：
Y. Niino;Jun-Hwan Choi;Masakazu A. R. Kobayashi;K. Nagamine;T. Totani;Bing Zhang
中科院分区：
文献类型：
--
作者：
Y. Niino;Jun-Hwan Choi;Masakazu A. R. Kobayashi;K. Nagamine;T. Totani;Bing Zhang
利用星系形成的宇宙流体动力学模拟，研究了伽玛射线暴（GRB）前身星系的金属丰度与GRB宿主星系的概率分布函数（PDF）之间的关系.我们施加一个最大限度的气体金属丰度，伽玛暴可以发生，并研究如何预测亮度PDF的伽玛暴宿主星系的变化在模拟中。我们进行了Kolmogorov-Smirnov检验，结果表明，当我们假设核心坍缩超新星（SNe）跟踪星星的形成时，我们的模拟结果与观测到的SNe宿主星系的光度PDF是一致的。当我们假设伽玛暴只发生在Z = 0.1 Z的低金属丰度环境中时，伽玛暴发生在低光度星系中，模拟的光度PDF与观测的光度PDF在数量上是一致的。尘埃消光对暗伽玛暴宿主星系的观测偏差可能是伽玛暴宿主星系光度较低的另一个原因，但在我们的模拟中，观测到的伽玛暴宿主星系的光度PDF不能完全由尘埃偏差重现。
We study the relationship between the metallicity of gamma-ray burst (GRB) progenitors and the probability distribution function (PDF) of GRB host galaxies as a function of luminosity using cosmological hydrodynamic simulations of galaxy formation. We impose a maximum limit to the gas metallicity in which GRBs can occur and examine how the predicted luminosity PDF of GRB host galaxies changes in the simulation. We perform the Kolmogorov–Smirnov test and show that the result from our simulation agrees with the observed luminosity PDF of core-collapse supernovae (SNe) host galaxies when we assume that the core-collapse SNe trace star formation. When we assume that GRBs occur only in a low-metallicity environment with Z ≲ 0.1 Z☉, GRBs occur in lower luminosity galaxies, and the simulated luminosity PDF becomes quantitatively consistent with the observed one. The observational bias against the host galaxies of optically dark GRBs owing to dust extinction may be another reason for the lower luminosities of GRB host galaxies, but the observed luminosity PDF of GRB host galaxies cannot be reproduced solely by the dust bias in our simulation.