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arXiv 1201.0797astro-ph.CO
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AKARI NEP-Deep巡天:中红外源目录

The AKARI NEP-Deep survey: a mid-infrared source catalogue

T. Takagi, H. Matsuhara, T. Goto, H. Hanami, M. Im, T. Ishigaki, H. M. Lee, M. Malkan, Y. Ohyama, S. Oyabu, C. P. Pearson, S. Serjeant, T. Wada, G. J. White

摘要:

我们提出了一个新的目录中红外源使用AKARI NEP-Deep调查。AKARI机载的红外摄像机(IRC)具有全面的中红外波长覆盖范围,在2 - 24微米范围内具有9个光度波段。我们利用所有这些波段覆盖了北极附近的一个近乎圆形的区域。我们设计的星表包括了在7、9、11、15和18微米波段探测到的大部分源,在0.67平方度的区域内发现了7284个源。从我们的模拟中,我们估计,在15 - 18微米的200微焦耳范围内,目录完成了约80%,由于源混合,约10%的源被遗漏。星-星系分离只使用AKARI测光法进行,结果发现10%的编目来源是恒星。在11,15,18和24微米的数量计数为恒星和星系。在~300 μ Jy的通量水平下,在11和15微米之间发现源密度的急剧增加。这可能是由于在8微米处的红移PAH发射,给出了我们从AKARI颜色-颜色图对红移的粗略估计。随着中红外源目录,我们提出了光学近红外测光的来源内的斯巴鲁/Sprime-cam图像覆盖部分的AKARI NEP-Deep领域,这是深到足以检测大多数AKARI中红外源,并有用的研究光学特性的一个完整的中红外源样本。

英文摘要:

We present a new catalogue of mid-IR sources using the AKARI NEP-Deep survey. The InfraRed Camera (IRC) onboard AKARI has a comprehensive mid-IR wavelength coverage with 9 photometric bands at 2 - 24 micron. We utilized all of these bands to cover a nearly circular area adjacent to the North Ecliptic Pole (NEP). We designed the catalogue to include most of sources detected in 7, 9, 11, 15 and 18 micron bands, and found 7284 sources in a 0.67 deg^2 area. From our simulations, we estimate that the catalogue is ~80 per cent complete to 200 micro Jy at 15 - 18 micron, and ~10 per cent of sources are missed, owing to source blending. Star-galaxy separation is conducted using only AKARI photometry, as a result of which 10 per cent of catalogued sources are found to be stars. The number counts at 11, 15, 18, and 24 micron are presented for both stars and galaxies. A drastic increase in the source density is found in between 11 and 15 micron at the flux level of ~300 micro Jy. This is likely due to the redshifted PAH emission at 8 micron, given our rough estimate of redshifts from an AKARI colour-colour plot. Along with the mid-IR source catalogue, we present optical-NIR photometry for sources falling inside a Subaru/Sprime-cam image covering part of the AKARI NEP-Deep field, which is deep enough to detect most of AKARI mid-IR sources, and useful to study optical characteristics of a complete mid-IR source sample.

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