ATOMIC HYDROGEN PROPERTIES OF ACTIVE GALACTIC NUCLEI HOST GALAXIES: H i IN 16 NUCLEI OF GALAXIES (NUGA) SOURCES

ATOMIC HYDROGEN PROPERTIES OF ACTIVE GALACTIC NUCLEI HOST GALAXIES: H i IN 16 NUCLEI OF GALAXIES (NUGA) SOURCES
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活动星系核宿主星系的原子氢特性:16 个星系核 (NUGA) 源中的 H i

DOI:
10.1088/0004-6256/135/1/232
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发表时间:
2008
期刊:
The Astronomical Journal
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我们利用NRAO甚大阵(VLA)以高光谱和空间分辨率(分辨率:1020“,105 km s− 1)对16个附近的低光度活动星系核(AGN)所在的旋涡星系中氢原子(H i)的分布和运动学进行了全面的光谱成像观测。该样本包含一系列的核类型,从Seyfert到恒星形成核,最初被选为星系核项目(NUGA)-一个光谱和空间分辨干涉测量附近星系的气体动力学,旨在确定活动星系核的燃料机制和与宿主星系演化的关系。在这里,我们调查这些星系,他们的环境,他们的恒星分布,和他们的活动星系核类型的H i属性之间的关系。每个星系的大规模H i形态被分类为环形,螺旋形,或集中的AGN类型的形态分类比较显示,环结构是显着更常见的低电离窄发射线区(LINER)比在塞弗特宿主星系,这表明时间演化的AGN活动连同中性气体的再分配。动态扰动的H i盘也更普遍的LINER主机星系比塞弗特主机星系。虽然有几个星系被伴星包围(有些伴随着H i发射),但伴星的存在与活动星系核类型之间没有相关性(Seyfert/LINER)。
We present a comprehensive spectroscopic imaging survey of the distribution and kinematics of atomic hydrogen (H i) in 16 nearby spiral galaxies hosting low luminosity active galactic nuclei (AGN), observed with high spectral and spatial resolution (resolution:∼ 20'',∼ 5 km s− 1) using the NRAO Very Large Array (VLA). The sample contains a range of nuclear types ranging from Seyfert to star-forming nuclei, and was originally selected for the NUclei of GAlaxies project (NUGA)—a spectrally and spatially resolved interferometric survey of gas dynamics in nearby galaxies designed to identify the fueling mechanisms of AGN and the relation to host galaxy evolution. Here we investigate the relationship between the H i properties of these galaxies, their environment, their stellar distribution, and their AGN type. The large-scale H i morphology of each galaxy is classified as ringed, spiral, or centrally concentrated; comparison of the resulting morphological classification with the AGN type reveals that ring structures are significantly more common in low-ionization narrow emission-line regions (LINER) than in Seyfert host galaxies, suggesting a time evolution of the AGN activity together with the redistribution of the neutral gas. Dynamically disturbed H i disks are also more prevalent in LINER host galaxies than in Seyfert host galaxies. While several galaxies are surrounded by companions (some with associated H i emission), there is no correlation between the presence of companions and the AGN type (Seyfert/LINER).
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