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arXiv 2106.01772astro-ph.GA
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高红移窄线Seyfert 1星系:一个候选样品

High-redshift Narrow-line Seyfert 1 Galaxies: A Candidate Sample

Suvendu Rakshit, C. S. Stalin, Jari Kotilainen, Jaejin Shin

摘要:

窄线塞弗特1星系(NLS 1 s)的研究现在主要限于低红移($z<0.8$),因为它们的定义需要H $β$发射线的存在,这是红移的主要地面光谱调查在$z>0.8$的光谱覆盖范围。为了寻找高$z$ NLS 1候选者,我们研究了大样本SDSS DR 14类星体的H $β$和Mg II线性质之间的相关性。基于$\mathrm{FWHM(MgII)=(0.880\pm 0.005) \times FWHM(Hβ)+ (0.438\pm0.018)}$的强相关性,我们提出了一个具有Mg II $<$ 2000 km s $^{-1}$的FWHM的高$z$ NLS 1候选样本。高$z$样本包含2684个NLS 1,具有红移$z=0.8-2.5$,中值对数辐射热光度为$46.16\pm0.42$ erg s $^{-1}$,对数黑洞质量为$8.01\pm0.35 M_{\odot}$,对数爱丁顿比为$0.02\pm0.27$。射电探测到的高$z$ NLS 1 s的比例与低$z$ NLS 1 s和SDSS DR 14类星体在类似的红移范围内的比例相似,并且发现它们的射电光度与它们的黑洞质量密切相关。

英文摘要:

The study of narrow-line Seyfert 1 galaxies (NLS1s) is now mostly limited to low redshift ($z<0.8$) because their definition requires the presence of the H$β$ emission line, which is redshifted out of the spectral coverage of major ground-based spectroscopic surveys at $z>0.8$. We studied the correlation between the properties of H$β$ and Mg II lines of a large sample of SDSS DR14 quasars to find high-$z$ NLS1 candidates. Based on the strong correlation of $\mathrm{FWHM(MgII)=(0.880\pm 0.005) \times FWHM(Hβ)+ (0.438\pm0.018)}$, we present a sample of high-$z$ NLS1 candidates having FWHM of Mg II $<$ 2000 km s$^{-1}$. The high-$z$ sample contains 2684 NLS1s with redshift $z=0.8-2.5$ with a median logarithmic bolometric luminosity of $46.16\pm0.42$ erg s$^{-1}$, logarithmic black hole mass of $8.01\pm0.35 M_{\odot}$, and logarithmic Eddington ratio of $0.02\pm0.27$. The fraction of radio-detected high-$z$ NLS1s is similar to that of the low-$z$ NLS1s and SDSS DR14 quasars at a similar redshift range, and their radio luminosity is found to be strongly correlated with their black hole mass.

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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