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arXiv 0909.2535astro-ph.CO
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在SWIRE/XMM-NEWTON/ELAIS-S1场中Spitzer源的光谱鉴别:大部分具有高F(24微米)/F(R)比的活动星系核

Spectroscopic identifications of Spitzer sources in the SWIRE/XMM-NEWTON/ELAIS-S1 field: a large fraction of Active Galactic Nuclei with high F(24micron)/F(R) ratio

N. Sacchi, F. La Franca, C. Feruglio, F. Fiore, S. Puccetti, F. Cocchia, S. Berta, M. Brusa, A. Cimatti, A. Comastri, A. Franceschini, C. Gruppioni, R. Maiolino… 展开作者

N. Sacchi, F. La Franca, C. Feruglio, F. Fiore, S. Puccetti, F. Cocchia, S. Berta, M. Brusa, A. Cimatti, A. Comastri, A. Franceschini, C. Gruppioni, R. Maiolino, I. Matute, M. Polletta, L. Pozzetti, F. Pozzi, C. Vignali, G. Zamorani, S. Oliver, M. Rowan-Robinson, G. Smith, C. Lonsdale

摘要:

我们提出了一个目录的光谱识别源斯皮策在3.6或24微米下降到10和280微焦,分别在SWIRE/XMM-牛顿/ELAIS-S1领域和分类通过线宽分析和诊断图。在甚大望远镜和3.6米欧洲南方天文台望远镜上,用FORS 2、VIMOS和EFOSC 2进行的低分辨率光谱学研究共识别了1376个低至R~24.2等的源(在3.6微米处检测到1362个,在24微米处检测到419个,在两者处检测到405个)。光谱活动已经在ELAIS-S1的中心0.6平方度区域进行,特别是XMM-牛顿和钱德拉也观察到了。我们发现了第一个直接的光谱证据,即活动星系核(AGN;主要是AGN 2)的比例随着F(24微米)/F(R)比值的增加而增加,在316<F(24微米)F(R)<1000的范围内达到70(+/-20)%。我们提出了一个IRAC-MIPS的颜色-颜色图能够区分AGN 1模糊AGN 2的候选人。在对我们的样品的光谱不完整性进行校正之后,结果是在F(24微米)=0.8 mJy处活动星系核的分数为~22(+/-7)%,并缓慢地下降到~19(+/-5)%,直到F(24微米)=0.3 mJy。

英文摘要:

We present a catalog of optical spectroscopic identifications of sources detected by Spitzer at 3.6 or 24 micron down to 10 and 280 microJy, respectively, in the SWIRE/XMM-Newton/ELAIS-S1 field and classified via line width analysis and diagnostic diagrams. A total of 1376 sources down to R~24.2 mag have been identified (1362 detected at 3.6 micron, 419 at 24 micron, and 405 at both) by low-resolution optical spectroscopy carried out with FORS2, VIMOS, and EFOSC2 at the Very Large Telescope and 3.6m ESO telescopes. The spectroscopic campaigns have been carried out over the central 0.6 square degrees area of ELAIS-S1 which, in particular, has also been observed by XMM-Newton and Chandra. We find the first direct optical spectroscopic evidence that the fraction of active galactic nuclei (AGN; mostly AGN2) increases with increasing F(24 micron)/F(R) ratio, reaching values of 70(+/-20)% in the range 316<F(24 micron)F(R)<1000. We present an IRAC-MIPS color-color diagram able to separate AGN1 from obscured AGN2 candidates. After having corrected for the spectroscopic incompleteness of our sample, it results that the AGN fraction at F(24 micron)=0.8 mJy is ~22(+/-7)% and decreases slowly to ~19(+/-5)% down to F(24 micron)=0.3 mJy.

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