Identifying Subclasses of Long Gamma-Ray Bursts with Cumulative Light Curve Morphology of Prompt Emissions
Identifying Subclasses of Long Gamma-Ray Bursts with Cumulative Light Curve Morphology of Prompt Emissions
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DOI：
10.1093/pasj/65.1.3
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发表时间：
2012-01
影响因子：
2.3
通讯作者：
Ryo Tsutsui;Takashi Nakamura;D. Yonetoku;Keitaro Takahashi;Y. Morihara
中科院分区：
文献类型：
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作者：
Ryo Tsutsui;Takashi Nakamura;D. Yonetoku;Keitaro Takahashi;Y. Morihara
我们主张使用瞬时发射的累积光曲线的形态来提出长伽马射线暴（LGRB）的新分类方案。我们通过与恒定光度 (ADCL) 的绝对偏差对形态进行参数化，并得出 36 个 LGRB 的值，这些 LGRB 具有光谱红移、由波段模型确定的光谱参数、1 秒峰值通量、注量和 64 毫秒分辨率光曲线，其峰值计数比背景波动大 10 倍。基于 ADCL 值可能的双峰分布，我们将样本分为两组（ADCL 0.17），并为每组导出光谱峰值能量 Ep-峰值光度 Lp 相关性和 LGRB 的基本平面，这是 Ep、光度时间 TL（� Eiso=Lp，其中 Eiso 是各向同性能量）和 Lp 之间的相关性。我们发现大型 ADCL 事件在 Ep = 10 2:71 keV 和 TL = 10 0:86 s 时的基本平面比具有 5-� 能级的小型 ADCL 事件亮 2.8 倍。具有小和大 ADCL 的基本平面由 Lp = 10 52:53˙0:01 (Ep=10 2:71 keV) 1:84˙0:03 (TL=10 0:86 s) 0:29˙0:08 给出，其中 � 2 = 10.93=14 且 Lp = 10 52:98˙0:08 (Ep=10 2:71 keV) 1:82˙0:09 (TL=10 0:86 s) 0:85˙0:27 与 � 2 = 7.58=8 分别。这一事实意味着存在以 ADCL 值为特征的 LGRB 子类。两个子类关系之间的另一个显着差异在于 TL 的指数，这可能提供关系物理的暗示，但重要性现在仅在 2-� 水平。此外，还暗示存在中间 ADCL 类，该类偏离了两个基本平面。这两种关系都非常紧密，以至于我们的结果提供了一种新的精确距离测量方案，直至高红移宇宙。
We argue for a new classification scheme of long gamma-ray bursts (LGRBs) using the morphology of the cumulative light curve of prompt emission. We parametrize the morphology by an absolute deviation from their constant luminosity (ADCL), and derive the value for 36 LGRBs that have spectropic redshifts, spectral parameters determined by the Band model, 1-s peak fluxes, fluences, and 64-ms resolution light curves whose peak counts are 10-times larger than background fluctuations. Based on a possible bimodal distribution of the value of ADCL, we divide the sample into two groups (ADCL 0.17), and for each group derive the spectral peak energy Ep–peak luminosity Lp correlation and the Fundamental Plane of LGRBs, which is a correlation between Ep, the luminosity time TL (� Eiso=Lp where Eiso is isotropic energy), and Lp. We find that the Fundamental Plane at Ep = 10 2:71 keV and TL = 10 0:86 s for large ADCL events are 2.8-times brighter than that for small ADCL events with 5-� levels. The Fundamental Planes with small and large ADCL are given by Lp = 10 52:53˙0:01 (Ep=10 2:71 keV) 1:84˙0:03 (TL=10 0:86 s) 0:29˙0:08 with � 2 = 10.93=14 and Lp = 10 52:98˙0:08 (Ep=10 2:71 keV) 1:82˙0:09 (TL=10 0:86 s) 0:85˙0:27 with � 2 = 7.58=8, respectively. This fact implies the existence of subclasses of LGRBs characterized by the value of ADCL. The other significant difference between the relations for the two subclasses consists in the exponent of TL, which might provide a hint of the physics of the relations, but the significance is now only at 2-� levels. Also, there is a hint for the existence of an intermediateADCL class, which deviates from both fundamental planes. Both relations are so tight that our result provides a new accurate distance measurement scheme up to the high-redshift universe.