O ct 2 00 0 N-band Imaging of Seyfert Nuclei and the MIR-X-ray correlation
O ct 2 00 0 N-band Imaging of Seyfert Nuclei and the MIR-X-ray correlation
复制标题
O ct 2 00 0 Seyfert 核的 N 波段成像和 MIR-X 射线相关性
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
T. Böker
中科院分区：
文献类型：
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作者：
T. Böker
我们提出了新的中红外（N波段）图像的样本附近的8个塞弗特星系。在我们所有的目标中，我们都检测到一个中心的未解决的来源，在某些情况下，这是第一次被发现。特别是，我们已经检测到来自NGC 4945活动核的中红外发射，以前除了硬X射线外，在任何波长都没有检测到。我们还检测到Circinus星系沿着其长轴的环核扩展发射，并在NGC 3281中找到扩展环核发射的边缘证据。我们的数据的高空间分辨率（1.7）使我们能够将核点源的通量与扩展的环核星暴（如果存在）分开。我们用一些非活跃星暴星系的文献数据补充我们的样本，并将核N带通量与已发表的硬（2− 10 keV）X射线通量联系起来。我们发现紧密和良好分离的相关性之间的核N-带通量和X-射线通量的塞弗特和星暴核跨越超过3个数量级的光度。我们证明，这些相关性可以作为一个强大的分类工具，星系核。例如，我们发现了强有力的证据，反对NGC 1808目前拥有一个活跃的塞弗特核，这是基于它在中红外X射线图中的位置。另一方面，我们确认NGC 4945实际上是一个塞弗特2星系。附属于欧洲航天局空间科学部天体物理司
We present new mid-infrared (N-band) images of a sample of eight nearby Seyfert galaxies. In all of our targets, we detect a central unresolved source, which in some cases has been identified for the first time. In particular, we have detected the mid-infrared emission from the active nucleus of NGC 4945, which previously remained undetected at any wavelength but hard X-rays. We also detect circumnuclear extended emission in the Circinus galaxy along its major axis, and find marginal evidence for extended circumnuclear emission in NGC 3281. The high spatial resolution (1.7) of our data allows us to separate the flux of the nuclear point sources from the extended circumnuclear starburst (if present). We complement our sample with literature data for a number of non-active starburst galaxies, and relate the nuclear N-band flux to published hard (2−10keV) X-ray fluxes. We find tight and well-separated correlations between nuclear N-band flux and X-ray flux for both Seyfert and starburst nuclei which span over 3 orders of magnitude in luminosity. We demonstrate that these correlations can be used as a powerful classification tool for galactic nuclei. For example, we find strong evidence against NGC 1808 currently harbouring an active Seyfert nucleus based on its position in the mid-infrared-X-ray diagram. On the other hand, we confirm that NGC 4945 is in fact a Seyfert 2 galaxy. Affiliated with the Astrophysics Division, Space Science Department, European Space Agency