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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Early Science Result from the Japanese Virtual Observatory: AGN and Galaxy Clustering at z = 0.3 to 3.0
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Early Science Result from the Japanese Virtual Observatory: AGN and Galaxy Clustering at z = 0.3 to 3.0

机译：日本虚拟天文台的早期科学成果：z = 0.3到3.0时的AGN和银河星系聚类

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摘要

We present the result of a projected cross-correlation analysis of AGNs and galaxies at redshifts from 0.3 to 3.0. The Japanese Virtual Observatory (JVO) was used to obtain Subaru Suprime-Cam images and UKIDSS catalog data around AGNs. We investigated 1809 AGNs, which is about a ten-times larger sample than that used in previous studies on AGN-galaxy clustering at redshifts larger than 0.6; 90% of the AGN samples were optically-selected AGN from the SDSS and 2dF catalogs. The galaxy samples at low redshift include many redder objects from the UKIDSS survey, while at higher redshift they are mainly blue galaxies from Suprime-Cam. We found a significant excess of galaxies around the AGNs at redshifts from 0.3 to 1.8. For the low-redshift samples (z 0.9), we obtained a correlation length of 5-6 Mpc (1.8), which indicates that the AGNs at this redshift range reside in a similar environment around typical local galaxies. We also found that AGNs at higher redshift ranges reside in a denser environment than lower redshift AGNs. For z 1.3-1.8 AGNs, the cross-correlation length was measured as 11 Mpc (1.8). Considering that our sample of galaxies is based on optical observations with Suprime-Cam at the redshift range, it is expected that blue star-forming galaxies comprise the majority of objects that are observed to be clustered around the AGNs. It has been successfully demonstrated that using the archive through the Virtual Observatory system can provide a powerful tool for investigating the small-scale environment of intermediate redshift AGNs.
机译：我们提出了从0.3到3.0的红移的AGN和星系的投影互相关分析的结果。日本虚拟天文台（JVO）用于获取围绕AGN的Subaru Suprime-Cam图像和UKIDSS目录数据。我们研究了180​​9个AGN，这比以前的研究中AGN-星系星团在红移大于0.6时的研究大约大十倍。 90％的AGN样品是从SDSS和2dF目录中进行光学选择的AGN。低红移的星系样本包括来自UKIDSS调查的许多较红的物体，而高红移的星系样本主要是来自Suprime-Cam的蓝色星系。我们发现，在AGN周围的星系从0.3到1.8的红移明显过量。对于低红移样本（z 0.9），我们获得了5-6 Mpc（1.8）的相关长度，这表明在该红移范围内的AGN位于典型本地星系周围的相似环境中。我们还发现，与较低的红移AGN相比，处于较高红移范围的AGN处于更密集的环境中。对于z 1.3-1.8 AGN，互相关长度的测量值为11 Mpc（1.8）。考虑到我们的星系样本是基于Suprime-Cam在红移范围内的光学观测结果，因此可以预期，形成蓝星的星系包括被观测到聚集在AGN周围的大多数物体。已经成功地证明，通过虚拟天文台系统使用档案可以为调查中间红移AGN的小规模环境提供强大的工具。

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