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arXiv 2106.09010astro-ph.CO
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远紫外Fe发射作为爱丁顿比的替代

Far-UV Fe Emission as Proxy of Eddington Ratios

Wei Zheng

摘要:

爱丁顿比是决定类星体性质多样性的一个关键参数。它可以缩放与光学Fe II和[O III]发射之间的强反相关。为了在远紫外波段寻找这样的指标,结合它们的光学SDSS对应物,分析了150个低红移类星体的HST远紫外光谱。Fe Ⅱ +Fe Ⅲ 1123发射的强度与光学Fe Ⅱ的强度显著相关。Fe II 1071和光学Fe II之间也可能存在适度的相关性。这一发现开启了远紫外Fe II发射可能作为爱丁顿比的新衡量标准的可能性。远紫外波段的高、低电离线呈现出不同的模式:爱丁顿比越大,低电离紫外线越强,而高电离紫外线越宽越弱。

英文摘要:

The Eddington ratio is a key parameter that governs the diversity of quasar properties. It can be scaled with a strong anti-correlation between optical Fe II and [O III] emission. In search of such indicators in the far-UV band, the HST far-UV spectra of 150 low-redshift quasars are analyzed in combination with their optical SDSS counterparts. The strength of Fe II+Fe III 1123 emission is significantly correlated with that of optical Fe II. A moderate correlation may also exist between Fe II 1071 and optical Fe II. The finding opens the possibility that far-UV Fe II emission may serve as a new gauge of the Eddington ratios. The high- and low-ionization lines in the far-UV band display different patterns: for the quasars with higher Eddington ratios, the low-ionization UV lines are stronger, and the high-ionization lines are broader and weaker.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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