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arXiv 1709.03561astro-ph.GA
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具有双峰窄发射线的2型Seyferts的甚长基线阵列成像:Sub-kpc双重活动星系核和喷流动力外流的研究

Very Long Baseline Array Imaging of Type-2 Seyferts with Double-Peaked Narrow Emission Lines: Searches for Sub-kpc Dual AGNs and Jet-Powered Outflows

Xin Liu, T. Joseph W. Lazio, Yue Shen, Michael A. Strauss

摘要:

利用甚长基线阵列(VLBA)观测了斯隆数字巡天(Sloan Digital Sky Survey)中发现的13个双峰型2型活动星系核(AGN),红移值为0.06 < z < 0.41(中位红移值为z~0.15)。这样的双峰发射线物体可能是由中央引擎的喷流或外流或双重活动星系核造成的。VLBA在许多这样的星系的距离上提供了<~10 pc的角分辨率,足以分辨来自非常接近的双重活动星系核的射电辐射,并有助于理解双峰[O III]发射线的起源。在3.6 cm(8.4 GHz)观测的13个星系中,我们检测到6个在1σ灵敏度水平为~0.15 mJy/光束,其中两个显示出清晰的喷流结构,尺度从几毫角秒到几十毫角秒(对应于几个pc到几十个pc,中位红移为0.15)。我们认为,无线电响亮的双峰发射线类型2活动星系核可能是指示喷流产生的结构,但更大的样本的双峰[O III]活动星系核高角分辨率无线电观测将需要确认这一建议。

英文摘要:

This paper presents Very Long Baseline Array (VLBA) observations of 13 double-peaked [O III] emission-line type-2 Active Galactic Nuclei (AGNs) at redshifts 0.06 < z < 0.41 (with a median redshift of z~0.15) identified in the Sloan Digital Sky Survey. Such double-peaked emission-line objects may result from jets or outflows from the central engine or from a dual AGN. The VLBA provides an angular resolution of <~10 pc at the distance of many of these galaxies, sufficient to resolve the radio emission from extremely close dual AGNs and to contribute to understanding the origin of double-peaked [O III] emission lines. Of the 13 galaxies observed at 3.6 cm (8.4 GHz), we detect six at a 1σ sensitivity level of ~0.15 mJy/beam, two of which show clear jet structures on scales ranging from a few milliarcseconds to tens of milliarcseconds (corresponding to a few pc to tens of pc at a median redshift of 0.15). We suggest that radio-loud double-peaked emission-line type-2 AGNs may be indicative of jet produced structures, but a larger sample of double-peaked [O III] AGNs with high angular resolution radio observations will be required to confirm this suggestion.

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