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arXiv 0706.3053astro-ph
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用远紫外光谱探测器测量有源半导体的本征吸收

A Survey of Intrinsic Absorption in Active Galaxies using the Far Ultraviolet Spectroscopic Explorer

Jay P. Dunn, D. Michael Crenshaw, S. B. Kraemer, J. R. Gabel

摘要:

本文介绍了远紫外光谱探测器(FUSE)观测到的72个塞弗特星系和类星体的概况。我们已经确定,72 253个可用的活动星系核(AGN)的目标是可行的目标,用于检测的内在吸收线。我们研究了这些光谱中的O VI双峰(λ 1031.9,1037.6)和莱曼β(λ 1025.7)的固有吸收的迹象。塞弗特1星系和z < 0.15的低红移类星体中,有约50%显示出内禀紫外线吸收的证据,这略低于Crenshaw等人(1999)基于哈勃太空望远镜(HST)观测到的塞弗特1星系的较小样本所发现的(60%)。有了这个新的分数,我们发现一个全球覆盖因子的吸收气体相对于中心核的~0.4。我们的调查是迄今为止最大的搜索高光谱分辨率的内在紫外吸收,是迈向更全面的研究在低红移活动星系核的内在吸收的第一步。

英文摘要:

We present a survey of 72 Seyfert galaxies and quasars observed by the it Far Ultraviolet Spectroscopic Explorer (FUSE). We have determined that 72 of 253 available active galactic nuclei (AGN) targets are viable targets for detection of intrinsic absorption lines. We examined these spectra for signs of intrinsic absorption in the O VI doublet (lambda 1031.9, 1037.6) and Lyman beta (lambda 1025.7). The fraction of Seyfert 1 galaxies and low-redshift quasars at z < 0.15 that show evidence of intrinsic UV absorption is ~50%, which is slightly lower than Crenshaw et al. (1999) found (60%) based on a smaller sample of Seyfert 1 galaxies observed with the Hubble Space Telescope (HST). With this new fraction we find a global covering factor of the absorbing gas with respect to the central nucleus of ~0.4. Our survey is to date the largest searching for intrinsic UV absorption with high spectral resolution, and is the first step toward a more comprehensive study of intrinsic absorption in low-redshift AGN.

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