CO Survey of a Distance-limited Seyfert Sample. I. The Data
CO Survey of a Distance-limited Seyfert Sample. I. The Data
复制标题
距离有限的 Seyfert 样本的 CO 调查。
DOI：
10.1086/300527
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
N. Nakai
中科院分区：
文献类型：
--
作者：
B. Vila;Y. Taniguchi;N. Nakai
本文给出了用NRO 45 m望远镜对43个邻近Seyfert星系（cz ≤ 5000 km s-1）中心区的~（12）CO（J = 1-0）观测数据。该样品的一般性质也进行了讨论，但更详细的分析被推迟到纸二。该样品的CO检测率（即，几乎50%）与该望远镜在类似红移范围内进行的其他螺旋星系调查相当。1型和2型塞弗特星系的探测率似乎没有区别。由于我们观察到一个以原子核为中心的单点，并且45米望远镜的光束HPBW与这些物体的表观光学直径的平均比值为0.13，因此只有一小部分分子气体被回收。然而，一个明确的相关性的CO含量与红外光谱远红外区的光度也被认为是，似乎有一种趋势，塞弗特星系更接近正常星系比星爆。这些星系中分子气体的径向分布在大多数情况下与急剧下降的函数是相容的。我们的高空间分辨率观测跟踪的界面区域之间的大尺度属性的主星系盘和活跃的核区域。这个界面区域是与这些天体中的核能源的燃料供给最直接相关的区域，因此可以与类似空间尺度下的非活动星系样本数据进行比较，以推断核周气体含量和动力学与核活动的可能关系（见论文二）。
We present the data of 12CO (J = 1–0) observations of the central regions of a sample of 43 nearby Seyfert galaxies (cz ≤ 5000 km s-1) with the NRO 45 m telescope. The general properties of this sample are also discussed, but a more detailed analysis is deferred to Paper II. The CO detection rate of this sample (i.e., almost 50%) is comparable to that of other spiral galaxy surveys in similar redshift ranges made with that telescope. There seems to be no difference in the detection rates of Seyfert galaxies types 1 and 2. Since we observed a single point centered at the nucleus, and the average ratio of the beam HPBW of the 45 m telescope to the apparent optical diameter of these objects was 0.13, only a small fraction of the total molecular gas is recovered. However, a clear correlation of the CO contents with the IRAS FIR luminosities is also seen, and there seems to be a tendency for Seyfert galaxies to be closer to normal galaxies than to starbursts. The radial distribution of the molecular gas in these galaxies is compatible in most cases with a steeply decreasing function. Our high spatial resolution observations trace the interface region between the large scale properties of the disks of the host galaxies and the active nuclear regions. This interface region is the one most directly associated to the fuelling of the nuclear energy source in these objects and can be thus compared with data on samples of nonactive galaxies at similar spatial scales to deduce the possible relation of the circumnuclear gas contents and dynamics with nuclear activity (see Paper II).
Naomasa Nakai：“智利北部气象数据测量（1994 年 8 月至 10 月）21GC02：准备中”
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--