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首页> 外文期刊>Astronomy and astrophysics >Mapping far-IR emission from the central kiloparsec of NGC?1097
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Mapping far-IR emission from the central kiloparsec of NGC?1097

机译：绘制NGC 1097中心距的远红外发射图

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Using photometry of NGC1097 from the Herschel PACS(Photodetector Array Camera and Spectrometer) instrument, we study theresolved properties of thermal dust continuum emission from acircumnuclear starburst ring with a radius 900pc. Theseobservations are the first to resolve the structure of a circumnuclearring at wavelengths that probe the peak (i.e. m) of the dust spectral energy distribution. The ring dominatesthe far-infrared (far-IR) emission from the galaxy - the high angularresolution of PACS allows us to isolate the ring's contribution and wefind it is responsible for 75, 60 and 55% of the total flux of NGC1097 at 70, 100 and 160m, respectively. We compare the far-IRstructure of the ring to what is seen at other wavelengths andidentify a sequence of far-IR bright knots that correspond to thoseseen in radio and mid-IR images. The mid- and far-IR band ratios inthe ring vary by less than 20% azimuthally, indicating modestvariation in the radiation field heating the dust on 600pcscales. We explore various explanations for the azimuthal uniformityin the far-IR colors of the ring including a lack of well-defined agegradients in the young stellar cluster population, a dominantcontribution to the far-IR emission from dust heated by older(>10Myr) stars and/or a quick smoothing of local enhancementsin dusttemperature due to the short orbital period of the ring. Finally, weimprove previous limits on the far-IR flux from the inner 600pc of NGC1097 by an order of magnitude, providing a better estimateof the total bolometric emission arising from the active galacticnucleus and its associated central starburst.Key words: infrared: galaxies - galaxies: star formation - galaxies: individual: NGC1097 - dust, extinction
机译：利用Herschel PACS（光探测器阵列相机和光谱仪）仪器对NGC1097的光度测定，研究了半径为900pc的无核星爆环的热尘连续散发特性。这些观测结果是第一个在探测粉尘光谱能量分布的峰值（即m）的波长处解析环核结构的方法。该环主导了银河系的远红外（far-IR）发射-PACS的高角度分辨率使我们能够分离出环的贡献，并确定其在70、100时分别占NGC1097总通量的75、60和55％和160m。我们将环的远红外结构与在其他波长下看到的环进行比较，并识别出一系列远红外明亮结，它们对应于无线电和中红外图像中看到的结。环中的中红外和远红外频带比率的方位角变化小于20％，表明辐射场的适度变化将尘埃加热到600pcscales。我们探索了该环的远红外颜色的方位均匀性的各种解释，包括在年轻的恒星群中缺乏明确的年龄梯度，这是由年长（> 10Myr）恒星和/或由于圆环的轨道周期短而使局部尘土温度快速增强。最后，我们将NGC1097内部600pc的远红外通量的限制提高了一个数量级，从而更好地估计了由活跃银河核及其相关中心星爆产生的总辐射线发射。 ：恒星形成-星系：个人：NGC1097-尘埃，灭绝

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