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arXiv 2203.08602astro-ph.GA
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用SDSS-IV MaNGA测定活动星系核附近的气相金属丰度：贫金属吸积的证据

Gas phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA: evidence of metal poor accretion

Janaína C. do Nascimento, Oli L. Dors, Thaisa Storchi-Bergmann, Nícolas D. Mallmann, Rogério Riffel, Gabriele S. Ilha, Rogemar A. Riffel, Sandro B. Rembold, Ali… 展开作者

Janaína C. do Nascimento, Oli L. Dors, Thaisa Storchi-Bergmann, Nícolas D. Mallmann, Rogério Riffel, Gabriele S. Ilha, Rogemar A. Riffel, Sandro B. Rembold, Alice Deconto-Machado, Luiz N. da Costa, Mark Armah

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摘要：

我们推导出的金属丰度（跟踪的O/H丰度）的窄线区（NLR）的108塞弗特星系以及径向金属丰度梯度沿其星系盘和这些匹配的控制样本没有活动的星系。有鉴于此，考虑了SDSS-IV MaNGA调查的观测数据和文献中的强发射线校准。每个活动星系核（AGN）的NLR %获得的金属丰度值进行了比较，从径向氧丰度梯度的外推，从沿星系盘的\ion{H}{ii}区域估计，到宿主星系的中心部分。我们发现，对于大多数对象（$\sim 80\,\%$），NLR金属丰度低于外推值，这些估计值之间的平均差异（$<D>$）范围从0.16到0.30 dex。我们认为，$<D>$是由于贫金属气体吸积到活动星系核中，从而供给核超大质量黑洞（SMBH），这些气体来自SMBH周围的储存分子和/或中性氢。此外，我们寻找$D$和电子密度（$N_{\rm e}$），[ \ion{O}{iii} ] $λ$ 5007和H $α$光度，消光系数（$A_{V})$的NLR，以及恒星质量（$M_{*}$）的宿主星系之间的相关性。发现$D$与参数$N_{\rm e}$、$M_{*}$和$A_{\rm v}$之间存在负相关的证据。

英文摘要：

We derive the metallicity (traced by the O/H abundance) of the Narrow Line Region ( NLR) of 108 Seyfert galaxies as well as radial metallicity gradients along their galaxy disks and of these of a matched control sample of no active galaxies. In view of that, observational data from the SDSS-IV MaNGA survey and strong emission-line calibrations taken from the literature were considered. The metallicity obtained for the NLRs %each Active Galactic Nucleus (AGN) was compared to the value derived from the extrapolation of the radial oxygen abundance gradient, obtained from \ion{H}{ii} region estimates along the galaxy disk, to the central part of the host galaxies. We find that, for most of the objects ($\sim 80\,\%$), the NLR metallicity is lower than the extrapolated value, with the average difference ($<D>$) between these estimates ranging from 0.16 to 0.30 dex. We suggest that $<D>$ is due to the accretion of metal-poor gas to the AGN that feeds the nuclear supermassive black hole (SMBH), which is drawn from a reservoir molecular and/or neutral hydrogen around the SMBH. Additionally, we look for correlations between $D$ and the electron density ($N_{\rm e}$), [\ion{O}{iii}]$λ$5007 and H$α$ luminosities, extinction coefficient ($A_{V})$ of the NLRs, as well as the stellar mass ($M_{*}$) of the host galaxies. Evidences of an inverse correlation between the $D$ and the parameters $N_{\rm e}$, $M_{*}$ and $A_{\rm v}$ were found.

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