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arXiv 0912.2159astro-ph.COastro-ph.GA
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关于H2O脉泽星系的核遮蔽

On the nuclear obscuration of H2O maser galaxies

J. S. Zhang, C. Henkel, Q. Guo, H. G. Wang, J. H. Fan

摘要:

为了揭示22 GHz H2O脉泽星系的环核环境,我们分析了它们的一些多波长性质,包括远红外光度(FIR)、[O III] \lambda 5007发射线光度、核X射线光度和中性铁Ka发射线的等效宽度(EW(Ka)).我们的统计分析包括总共85个来源,其中大多数窝藏一个活动星系核(AGN)。EW(Ka)和两个“光学厚度参数”之间存在很强的反相关性,即X射线光度与可能更各向同性辐射的[O III]和远红外(FIR)光度的比值。根据这些反相关,可以建立一套康普顿厚核区的定量判据:EW(Ka)> 300 eV,L_{2-10keV} < 2L_[O III]和L_{FIR} > 600 L_{2-10keV}。18个H2O脉泽星系属于这一类。EW(Ka)、[O III]光度与各向同性H2O脉泽光度之间没有明显的相关性。当比较有和没有探测到H_2O脉泽线的Seyfert 2s样品时,EW(Ka)和康普顿厚核的比例似乎存在差异。应进一步研究这一点。对于单独的活动星系核脉泽,FIR和H_2O脉泽亮度之间没有明显的相关性。然而,包括与恒星形成区相关的脉泽,揭示了线性相关性。总的来说,河外FIR-H2O数据与银河脉泽源的对应关系一致,外推几个数量级到更高的光度。

英文摘要:

To shed light onto the circumnuclear environment of 22 GHz H2O maser galaxies, we have analyzed some of their multi-wavelength properties, including the far infrared luminosity (FIR), the luminosity of the [O III]\lambda5007 emission line, the nuclear X-ray luminosity, and the equivalent width of the neutral iron Ka emission line (EW (Ka)). Our statistical analysis includes a total of 85 sources, most of them harboring an active galactic nucleus (AGN). There are strong anti-correlations between EW (Ka) and two "optical thickness parameters", i.e. the ratios of the X-ray luminosity versus the presumably more isotropically radiated [O III] and far infrared (FIR) luminosities. Based on these anti-correlations, a set of quantitative criteria, EW (Ka) > 300eV, L_{2-10keV} < 2L_[O III] and L_{FIR} > 600L_{2-10keV} can be established for Compton-thick nuclear regions. 18 H2O maser galaxies belong to this category. There are no obvious correlations between the EW (Ka), the [O III] luminosity and the isotropic H2O maser luminosity. When comparing samples of Seyfert 2s with and without detected H2O maser lines, there seem to exist differences in EW (Ka) and the fraction of Compton-thick nuclei. This should be studied further. For AGN masers alone, there is no obvious correlation between FIR and H2O maser luminosities. However, including masers associated with star forming regions, a linear correlation is revealed. Overall, the extragalactic FIR-H2O data agree with the corresponding relation for Galactic maser sources, extrapolated by several orders of magnitude to higher luminosities.

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