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arXiv 1003.2858astro-ph.CO
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用2 MASS/ ROSAT表近红外选择AGN候选物的性质

Properties of Near-Infrared Selected AGN Candidates with 2MASS/ROSAT Catalogues

Shinjirou Kouzuma, Hitoshi Yamaoka

摘要:

本文报道了从2 MASS/ROSAT星表中提取的近红外活动星系核候选者,并讨论了它们的性质。首先,通过<= 30“的位置交叉识别提取ROSAT星表(即亮源星表(BSC)和暗源星表(FSC))中X射线源的近红外对应物。由于这些对应物会包含许多错误的识别,我们进一步施加了近红外颜色选择标准,并提取了可靠的活动星系核候选者(BSC:5,273,FSC:10,071)。在BSC(FSC)的5,273(10,071)个候选者中,2,053(1,008)个是已知的活动星系核。候选者的近红外和X射线性质显示出与已知活动星系核相似的性质,与以前的研究是一致的。我们还搜索了其他波长(即光学,近红外和无线电)的对应物,并研究了多波长的特性。在已知活动星系核和未分类的来源之间没有明显的区别。然而,在FSC中的一些未分类的源显示出与已知活动星系核相比略有不同的性质。因此,尽管FSC中的候选者可能是虚假的,但我们很有可能提取出可靠的活动星系核候选者。

英文摘要:

We report on the near-infrared selected AGN candidates extracted from 2MASS/ROSAT catalogues and discuss their properties. First, near-infrared counterparts of a X-ray source in ROSAT catalogues (namely, Bright Source Catalogue (BSC) and Faint Source Catalogue (FSC)) were extracted by positional cross-identification of <=30''. Because these counterparts would contain many mis-identifications, we further imposed near-infrared colour selection criteria and extracted reliable AGN candidates (BSC: 5,273, FSC: 10,071). Of 5,273 (10,071) candidates in the BSC (FSC), 2,053 (1,008) are known AGNs. Near-infrared and X-ray properties of candidates show similar properties with known AGNs and are consistent with previous studies. We also searched for counterparts in other wavelengths (that is, optical, near-infrared, and radio), and investigated properties in multiwavelength. No significant difference between known AGNs and unclassified sources could be seen. However, some unclassified sources in the FSC showed slightly different properties compared with known AGNs. Consequently, it is highly probable that we could extract reliable AGN candidates though candidates in the FSC might be spurious.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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