NGC1365核及核周活动的红外探测
Probing the Nuclear and Circumnuclear Activity of NGC1365 in the Infrared
摘要：
我们提供了新的远红外（70- 500微米）Herschel PACS和SPIRE成像观测，以及新的中红外Gemini/T-ReCS成像（8.7和18.3微米）和光谱的内林德布拉德共振（ILR）区域（R<2.5kpc）的螺旋星系NGC 1365。我们补充了这些观测与档案斯皮策成像和光谱测绘观测。NGC 1365的ILR区域包含一个Seyfert 1.5核和一个直径约为2kpc的恒星形成环。Herschel/PACS影像资料，以及斯皮策24微米连续辐射、[NeII] 12.81微米线辐射、6.2微米和11.3微米PAH辐射，都能分辨出环中强烈的恒星形成活动。活动星系核是中心区域最亮的源，直到λ ~ 24微米，但与位于环中的红外星团（或红外星团群）的发射相比，它在远红外区变得越来越微弱。我们用CLUMPY环面模型模拟了活动星系核未分辨的红外辐射，并估计活动星系核只贡献了内部~ 5 kpc产生的红外辐射的一小部分（~5%）。我们拟合了ILR区非活动星系核24- 500 μ m的光谱能量分布，发现尘埃的温度和质量与其他核和环核星暴区相似。最后，我们发现，在NGC 1365的ILR区域内，大部分正在进行的恒星形成活动都发生在尘埃区域，这是由24微米的发射探测到的。
英文摘要：
We present new far-infrared (70-500micron) Herschel PACS and SPIRE imaging observations as well as new mid-IR Gemini/T-ReCS imaging (8.7 and 18.3micron) and spectroscopy of the inner Lindblad resonance (ILR) region (R<2.5kpc) of the spiral galaxy NGC1365. We complemented these observations with archival Spitzer imaging and spectral mapping observations. The ILR region of NGC1365 contains a Seyfert 1.5 nucleus and a ring of star formation with an approximate diameter of 2kpc. The strong star formation activity in the ring is resolved by the Herschel/PACS imaging data, as well as by the Spitzer 24micron continuum emission, [NeII]12.81micron line emission, and 6.2 and 11.3micron PAH emission. The AGN is the brightest source in the central regions up to lambda~24micron, but it becomes increasingly fainter in the far-infrared when compared to the emission originating in the infrared clusters (or groups of them) located in the ring. We modeled the AGN unresolved infrared emission with the CLUMPY torus models and estimated that the AGN contributes only to a small fraction (~5%) of the infrared emission produced in the inner ~5kpc. We fitted the non-AGN 24-500micron spectral energy distribution of the ILR region and found that the dust temperatures and mass are similar to those of other nuclear and circumnuclear starburst regions. Finally we showed that within the ILR region of NGC1365 most of the on-going star formation activity is taking place in dusty regions as probed by the 24micron emission.
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