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arXiv 1605.02438astro-ph.GA
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不同红移下SN和GRB宿主星系的物理条件和元素丰度

Physical conditions and element abundances in SN and GRB host galaxies at different redshifts

M. Contini

摘要:

通过详细的光谱模拟,我们比较了超新星(SN)和伽马射线暴(GRB)宿主星系的物理参数和相对丰度。结果表明:1)长周期伽玛暴(LGRB)中的激波速度比SN宿主星系中的激波速度低。2)SN寄主的O/H相对丰度分布在8.0 <12+log(O/H)<8.85的范围内,而LGRB寄主的O/H相对丰度则接近太阳。SN和LGRB的N/H比都低于太阳辐射。3)少数SN宿主的星暴温度达到Ts >10^5 K。LGRB宿主的Ts为3-8 × 10 ~ 4K。4)Ha随电离参数U的增大而增大。我们认为,SN主机共生是更强的主机星系活动比GRB主机的能量范围内的相关的近紫外-光学-近红外光谱。

英文摘要:

We compare the physical parameters and the relative abundances calculated throughout supernova (SN) and gamma-ray burst (GRB) host galaxies by the detailed modelling of the spectra. The results show that : 1) shock velocities are lower in long period GRB (LGRB) than in SN host galaxies. 2) O/H relative abundance in SN hosts are scattered within a range 8.0 <12+log(O/H)<8.85 but they are close to solar in LGRB hosts. N/H are lower than solar for both SN and LGRB. 3) The starburst temperatures within a few SN hosts reach Ts >10^5 K. Ts in LGRB hosts are 3-8 10^4 K. 4) Ha increases with the ionization parameter U. We suggest that SN-host symbiosis is stronger in terms of host galaxy activity than GRB-host in the range of energies related to the near UV - optical - near IR spectra.

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