论文标题
2型衬套的光谱
Optical spectroscopy of type-2 LINERs
论文作者
论文摘要
2型低离子化狭窄的发射线区域（衬里）已通过palomar数据光学地分类为没有在与活动银河核（AGN）的宽线区域（BLR）相关的Balmer发射线（BLR）中呈现较大的组件。我们揭示了在局部样品（z $ \ leq $ 0.022）类型2衬里的核区域中发射线的不同运动组分的存在。我们通过源自BLR的广泛组件的检测（或不检测）来关注对它们的真实本质的分析。此外，我们搜索可能存在非旋转运动（例如流出）。我们使用从哈勃太空望远镜（HST）档案中检索到的9型2型衬里的光谱的光谱进行了光谱分析，对核发射线进行了分解。这项研究是由帕洛马观测站的双光谱仪的档案光谱完成的。发射线拟合揭示了9个星系中6个与BLR相关的广泛分量，用于空间基数据，而从地面光谱中的8个则存在8个。在HST/STIS数据中测得的两个星系的速度分散（NGC 4486和NGC 4594）表明存在流出。结果表明，空间分辨率在检测BLR中起着重要作用，因为它在基于地面的数据中似乎被稀释（即使在删除了恒星贡献之后）。对于发射线诊断，这也是如此，因为污染物的污染物有助于较低的排放线比标准BPT的星形成区域。我们建议将NGC4594重新分类为1型衬里，因为在空间和地面光谱中都可以看到BLR组件。我们发现NGC 4486的BLR成分的模棱两可的结果。样品中的适度流出检测可能表明它们不如类型1衬里那样频繁。
Type-2 Low-ionization Narrow Emission-line Regions (LINERs) have been optically classified with the Palomar data as not presenting a broad component in the Balmer emission lines associated to the Broad Line Region (BLR) of the Active Galactic Nuclei (AGN). We unveil the presence of different kinematic components of emission lines in the nuclear region of a sample of local (z$\leq$0.022) type-2 LINERs. We focus on the analysis of their true nature by means of the detection (or not) of a broad component originated in the BLR. Additionally, we search for the possible presence of non-rotational motions such as outflows. We have applied a decomposition of the nuclear emission lines using a spectroscopic analysis of the optical spectra of 9 type-2 LINERs of intermediate-resolution data retrieved from the Hubble Space Telescope (HST) archive. The study is completed with archival spectra from the Double Spectrograph from the Palomar Observatory. The emission line fitting reveals the presence of a broad component associated to the BLR in 6 out of the 9 galaxies for the space-based data, and for 2 out of the 8 from the ground-based spectra. The velocity dispersion of two galaxies (NGC 4486 and NGC 4594) measured in HST/STIS data suggest the presence of outflows. The results indicate that the spatial resolution plays a major role in the detection of the BLR, as it appears diluted in the ground-based data (even after removing stellar contribution). This is also true for the emission line diagnostics, as the contaminant light contributes to lower emission line ratios towards the star-forming area of standard BPTs. We propose to reclassify NGC4594 as a type-1 LINER, since a BLR component is seen in both space- and ground-based spectra. We find ambiguous results for the BLR component of NGC 4486. The modest outflow detection in our sample may indicate that they are not as frequent as for type-1 LINERs.
