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arXiv 1105.0422astro-ph.CO
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SN 2010 ma与GRB 101219 B相关的光谱证据

Spectroscopic evidence for SN 2010ma associated with GRB 101219B

M. Sparre, J. Sollerman, J. P. U. Fynbo, D. Malesani, P. Goldoni, A. de Ugarte Postigo, S. Covino, V. D'Elia, H. Flores, F. Hammer, J. Hjorth, P. Jakobsson, L. … 展开作者

M. Sparre, J. Sollerman, J. P. U. Fynbo, D. Malesani, P. Goldoni, A. de Ugarte Postigo, S. Covino, V. D'Elia, H. Flores, F. Hammer, J. Hjorth, P. Jakobsson, L. Kaper, G. Leloudas, A. J. Levan, B. Milvang-Jensen, S. Schulze, G. Tagliaferri, N. R. Tanvir, D. J. Watson, K. Wiersema, R. A. M. J. Wijers

摘要:

我们报告了与长伽马射线暴GRB 101219 B相关的超新星SN 2010 ma的光谱检测。我们在VLT用X射线摄谱仪观测了三个晚上的伽马射线暴的光学对应物。从弱吸收线,我们测量到z = 0.55的红移。第一个时代的紫外-近红外余辉光谱,采取11.6小时后爆发,是很好的拟合幂律与X射线光谱的斜率一致。然而,如果放置在z=0.55处,第二个和第三个历元光谱(在爆发后16.4和36.7天获得)显示出与宽线型Ic SN 1998 bw非常相似的明显凸起。除了证明可以在这些大距离处观察到伽马射线暴的光谱SN签名外,我们的发现在建立伽马射线暴和SNe之间的一般联系方面向前迈进了一步。事实上,与大多数先前明确的GRB相关SNe不同,GRB 101219 B具有大的伽马射线能量(E_iso = 4.2 x 10^{51} erg),明亮的余辉,并遵守“Amati”关系,因此与GRB的宇宙学布居完全一致。

英文摘要:

We report on the spectroscopic detection of supernova SN 2010ma associated with the long gamma-ray burst GRB 101219B. We observed the optical counterpart of the GRB on three nights with the X-shooter spectrograph at the VLT. From weak absorption lines, we measure a redshift of z = 0.55. The first epoch UV--near-infrared afterglow spectrum, taken 11.6 hr after the burst, is well fit by a power law consistent with the slope of the X-ray spectrum. The second and third epoch spectra (obtained 16.4 and 36.7 days after the burst), however, display clear bumps closely resembling those of the broad-lined type-Ic SN 1998bw if placed at z=0.55. Apart from demonstrating that spectroscopic SN signatures can be observed for GRBs at these large distances, our discovery makes a step forward in establishing a general connection between GRBs and SNe. In fact, unlike most previous unambiguous GRB-associated SNe, GRB 101219B has a large gamma-ray energy (E_iso = 4.2 x 10^{51} erg), a bright afterglow, and obeys the "Amati" relation, thus being fully consistent with the cosmological population of GRBs.

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