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GRB 090423

GRB 090423
发现
发现时间07:55 UTC
2009年4月23日
发现人雨燕卫星
持续时间10秒
位置
赤经09h 55m 33.08s
赤纬+18° 08′ 58.9″
红移8.0 ≤ z ≤ 8.3
能量
参见伽玛射线暴分类:伽玛射线暴

GRB 090423是一个伽玛射线暴(GRB)。2009年4月23日世界标准时07:55:19,专门用于观测伽玛射线爆发[1]雨燕卫星探测到一次遥远的伽玛射线爆发,位置在轩辕十三(狮子座η,狮子座30)西方数度之处,它的红移值Z=8.2[2][3][4][5],这次事件距离地球130亿光年,发生在宇宙大爆炸后约6.3亿年的宇宙诞生初期,证实巨型恒星的诞生(和死亡)在非常早期的宇宙确实发生过[6]。GRB 090423在发现时是距离地球最远的天体,2010年被UDFy-38135539超越。而它离地球最远伽玛射线暴的纪录则在2011年5月被GRB 090429B打破。

在雨燕探测到GRB 090423之后一周,天文学家利用甚大天线阵探测到它的第一波射电辐射,并且在其后两个月追踪它的亮度变暗情况,发现这次爆发的前身星要比其他已知的伽玛射线爆发更明亮。这使得科学家怀疑宇宙中的第一代恒星要比后来形成的恒星温度更高,质量更大。但这种假说仍然需要对更多伽玛射线暴的观测来证实[7]

相关条目

参考资料

  1. ^ Krimm, H.; et al. GRB 090423: Swift detection of a burst. GCN Circulars. 2009, (9198) [2009-04-27]. (原始内容存档于2016-03-03). 
  2. ^ Cucchiara, A.; et al. GRB 090423: NIR photometry and evidence for spectral break. GCN Circulars. 2009, (9209) [2009-04-27]. (原始内容存档于2016-06-29). 
  3. ^ Olivares, H.; et al. GRB 090423: GROND detection and preliminary photo-z. GCN Circulars. 2009, (9215) [2009-04-27]. (原始内容存档于2013-05-11). 
  4. ^ Thoene, H.; et al. GRB 090423: TNG Amici spectrum. GCN Circulars. 2009, (9216) [2009-04-27]. (原始内容存档于2016-03-04). 
  5. ^ Tanvir, H.; et al. GRB 090423: VLT/ISAAC spectroscopy. GCN Circulars. 2009, (9219) [2009-04-27]. (原始内容存档于2013-05-11). 
  6. ^ TNG caught the farthest GRB observed ever. Fundación Galileo Galilei. 2009 [2009-04-25]. (原始内容存档于2012-05-24). 
  7. ^ More Observations of GRB 090423, the Most Distant Known Object in the Universe. [2010-02-19]. (原始内容存档于2009-11-03). 
纪录
上一纪录:
IOK-1
最遥远的天体
2009年-2010年
下一纪录:
UDFy-38135539
上一纪录:
GRB 080913
最遥远的伽玛射线暴
2009年-2011年
下一纪录:
GRB 090429B


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GRB 090423
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