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arXiv 0804.2395astro-ph
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南部天空中最亮的10微米星系的核心通量

The core flux of the brightest 10 micron galaxies in the southern sky

D. Raban, B. Heijligers, H. Rottgering, K. Meisenheimer, W. Jaffe, H. U. Kaufl, T. Henning

摘要:

目标。在8.9、11.9和12.9微米处拍摄了南部天空中最明亮的河外源的近衍射极限图像,以便最佳地计划在VLTI使用中红外干涉仪(MID-infrared Interferometric Instrument)进行N波段观测。方法.我们收集了21个样本,包括所有的活动星系核观测到的帕拉纳尔天文台,智利,加上三个非活动星系核对象,估计N带通量大于400 mJy。我们使用安装在ESO的3.6米望远镜上的TIMMI 2中红外仪器来获得近衍射极限图像,以便在< 0.5 arscsec内建立未分辨的核心通量。结果位置和核心的总通量,得到了我们的样本中的所有来源,并与文献中类似的调查。我们发现,15 AGN和NGC 253的核星爆在11.9微米处表现出<300 mJy的未分辨核心通量,使它们成为VLTI的有希望的目标。对于扩展源,近衍射极限图像的介绍和讨论。

英文摘要:

Aims. Near diffraction-limited images have been taken at 8.9, 11.9, and 12.9 micron for the brightest extragalactic sources in the southern sky, in order to optimally plan N-band observations with MIDI (MID-infrared Interferometric instrument) at the VLTI. Methods. We have assembled a sample of 21 objects consisting of all the AGNs observable from Paranal observatory, Chile, plus three non-AGN objects, with an estimated N-band flux greater than 400mJy. We used the TIMMI2 Mid Infrared instrument mounted on the ESO's 3.6m telescope to obtain near diffraction-limited images in order to establish the unresolved core flux within < 0.5 arscsec. Results. Positions and core total fluxes were obtained for all sources in our sample and compared with similar investigations in the literature. We find that 15 AGN and the nuclear starburst in NGC 253 exhibit an unresolved core flux < 300mJy at 11.9 micron, making them promising targets for MIDI at the VLTI. For extended sources, near diffraction-limited images are presented and discussed.

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