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
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Accepted for publication in the Astrophysical Journal. 15 pages, 17 figures, 2 tables
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.
We present the first detailed analysis of three extragalactic fields (IRAC Dark Field, ELAIS-N1, ADF-S) observed by the infrared satellite, AKARI, using an optimised data analysis toolkit specifically for the processing of extragalactic point sources. The InfraRed Camera (IRC) on AKARI complements the Spitzer space telescope via its comprehensive coverage between 8-24 microns filling the gap between the Spitzer IRAC and MIPS instruments. Source counts in the AKARI bands at 3.2, 4.1, 7, 11, 15 and 18 microns are presented. At near-infrared wavelengths, our source counts are consistent with coun…
We present new observational determination of the evolution of the rest-frame 70 and 160 micron and total infrared (TIR) galaxy luminosity functions (LFs) using 70 micron data from the Spitzer Wide-area Infrared Extragalactic Legacy Survey (SWIRE). The LFs were constructed for sources with spectroscopic redshifts only in the XMM-LSS and Lockman Hole fields from the SWIRE photometric redshift catalogue. The 70 micron and TIR LFs were constructed in the redshift range 0<z<1.2 and the 160 micron LF was constructed in the redshift range 0<z<0.5 using a parametric Bayesian and the vmax methods. We …
Evidence for Infrared-Faint Radio Sources as z > 1 Radio-Loud AGN
暗射电源(英语:Inferred-Faint Radio Source,缩写IFRS)是在澳大利亚望远镜大区域巡天(英语:Australia Telescope Large Area Survey)中发现的一类射电源,在斯皮策广域河外红外线巡天(英语:Spitzer Wide-area Infrared Extragaltic)中没有可观测到的中红外线对应物。扩展后的Chandra Deep Field South现在有更深的斯皮策成像(3.6至70微米),来自一些传统的调查。我们报告了两个IFRS源在IRAC图像中的检测。另外两个IFRS的未检测允许我们限制源类型。对这些天体的SED的详细模拟表明,它们与高红移(z > 1)活动星系核相一致。
Polarized Radio Sources: A Study of Luminosity, Redshift and Infrared Colors
自治领射电天体物理观测台深场偏振研究与欧洲大面积红外空间观测台北1场的斯皮策广域红外河外巡天相匹配。我们使用总强度均方根为87微焦的射束^-1进行VLA观测,以匹配SWIRE对应射电源。我们的射电样本的红外颜色分析表明,大多数偏振源是椭圆星系嵌入活动星系核。利用现有的红移星表,我们发现了429个射电源,其中69个是偏振的,红移范围为0.04 < z <3.2。对于我们的样品,我们发现红移和偏振百分比之间没有相关性。然而,对于极化射电源,我们发现一个微弱的相关性增加的百分比极化和降低光度。
Spectroscopic Confirmation of Three Red-Sequence Selected Galaxy Clusters at z=0.87, 1.16 and 1.21 from the SpARCS Survey
斯皮策适应性红序星系团巡天(SpARCS)是对50度^2斯皮策SWIRE遗留磁场的z '通带成像巡天,其主要目的是创建第一个z>1的大质量星系团的大型均匀选择样本。SpARCS使用红外适应的两个过滤器集群红色序列技术。在这篇论文中,我们报告了两个新的异常丰富的星系团的Keck/LRIS光谱确认,SpARCS J161315+564930,z=0.871+/-0.002,有14个高置信度成员,静止帧速度色散为sigma_v= 1230+/-320 km s^-1,和SpARCS J161641+554513,z=1.161+/-0.003,有7个高置信度成员(包括一个活动星系核),静止坐标系速度色散σ_v=950+/-330 km s^-1。我们还确认了第三个新系统,SpARCS J161037+552417,z=1.210+/-0.002,有7个高置信度成员,静止坐标系速度离散为sigma_v=410+/-300 km s^-1。这三个新的光谱证实的集群进一步证明了效率和有效性的双过滤器成像检测真正的星系团在高红移。我们的结论是,前景是好的,为当前一代的调查,旨在估计集群红移和质量在z>~1直接从光学红外成像。
Simulations of the cosmic infrared and submillimeter background for future large surveys: II. Removing the low-redshift contribution to the anisotropies using stacking