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arXiv 1610.06243astro-ph.GA
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2型AGN中微弱宽发射线的检测:I.近红外观测与光谱拟合

Detection of faint broad emission lines in type 2 AGN: I. Near infrared observations and spectral fitting

F. Onori, F. La Franca, F. Ricci, M. Brusa, E. Sani, R. Maiolino, S. Bianchi, A. Bongiorno, F. Fiore, A. Marconi, C. Vignali

摘要:

本文介绍了41个红移为$z \lesssim$ 0.1的暗活动星系核和中间活动星系核(类型2、1.9和1.8;活动星系核2)的中分辨率近红外光谱观测结果。这些观测是在对活动星系核2近红外光谱特性进行系统研究的框架内进行的,并使用ISAAC/VLT、X-shooter/VLT和LUCI/LBT进行,达到了每个分辨率元素的平均信噪比为$\sim$ 30。对于那些观察到的对象与X-射手,我们还获得了同时的光学和紫外光谱。在41个AGN 2中,我们发现了13个来自宽线区的成分,其半高宽为${\rm > 800 }$ km/s。我们已经证实,宽线区域组件的检测并不显着依赖于选择效果,由于光谱的质量,X射线或近红外通量,主星系的取向角或在X射线波段测量的氢柱密度。与1型活动星系核的对照样品相比,在活动星系核2中发现的平均宽线区成分具有显著(2倍)较小的半高宽。

英文摘要:

We present medium resolution near infrared spectroscopic observations of 41 obscured and intermediate class AGN (type 2, 1.9 and 1.8; AGN2) with redshift $z \lesssim$0.1, selected from the Swift/BAT 70-month catalogue. The observations have been carried out in the framework of a systematic study of the AGN2 near infrared spectral properties and have been executed using ISAAC/VLT, X-shooter/VLT and LUCI/LBT, reaching an average S/N ratio of $\sim$30 per resolution element. For those objects observed with X-shooter we also obtained simultaneous optical and UV spectroscopy. We have identified a component from the broad line region in 13 out of 41 AGN2, with FWHM ${\rm > 800 }$ km/s. We have verified that the detection of the broad line region components does not significantly depend on selection effects due to the quality of the spectra, the X-ray or near infrared fluxes, the orientation angle of the host galaxy or the hydrogen column density measured in the X-ray band. The average broad line region components found in AGN2 has a significantly (a factor 2) smaller FWHM if compared with a control sample of type 1 AGN.

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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