arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2301.02252astro-ph.GA
收藏

邻近赛弗特星系的光学与中红外谱线发射

Optical and mid-infrared line emission in nearby Seyfert galaxies

A. Feltre, C. Gruppioni, L. Marchetti, A. Mahoro, F. Salvestrini, M. Mignoli, L. Bisigello, F. Calura, S. Charlot, J. Chevallard, E. Romero-Colmenero, E. Curtis… 展开作者

A. Feltre, C. Gruppioni, L. Marchetti, A. Mahoro, F. Salvestrini, M. Mignoli, L. Bisigello, F. Calura, S. Charlot, J. Chevallard, E. Romero-Colmenero, E. Curtis-Lake, I. Delvecchio, O. L. Dors, M. Hirschmann, T. Jarrett, S. Marchesi, M. E. Moloko, A. Plat, F. Pozzi, R. Sefako, A. Traina, M. Vaccari, P. Väisänen, L. Vallini, A. Vidal-García, C. Vignali

AI总结:

本文基于42个邻近赛弗特星系的光学与中红外谱线数据,结合光致电离模型研究AGN、恒星形成和激波的电离贡献,发现中红外谱线比可反映AGN贡献比例,并提出[OI]/Halpha相关诊断图有望区分不同电离源。

摘要:

谱线比诊断为了解具有强烈黑洞吸积和星暴事件(如本地赛弗特星系或恒星形成历史峰值时期的星系)中电离辐射的来源提供了宝贵线索。我们旨在提供一套参考性的光学与中红外联合分析,用于通过谱线比研究活动星系核(AGN)的识别,并检验光致电离模型的预测。我们利用南部非洲大望远镜获得了42个赛弗特星系的均匀光学光谱,这些星系同时具有Spitzer/IRS光谱以及X射线到中红外的多波段数据。在确认了主要光学谱线([OIII])和中红外谱线([NeV]、[OIV]、[NeIII])在追踪AGN活动方面的能力之后,我们利用不同电离源(AGN、恒星形成和激波)的光致电离模型,探索了基于光学与中红外谱线比的诊断图。我们发现,对于AGN对中红外(5-40微米)发射的贡献比例大于50%的赛弗特星系,纯AGN光致电离模型能够很好地再现其观测结果。对于AGN贡献较低的目标,同样的模型不能完全再现观测到的中红外谱线比。与光学谱线比不同,[NeV]/[NeII]、[OIV]/[NeII]和[NeIII]/[NeII]等中红外谱线比显示出对AGN中红外贡献比例的依赖性。来自恒星形成或辐射激波的额外电离源有助于解释中红外的观测结果。在谱线比图中光学与中红外诊断的组合中,只有涉及[OI]/Halpha比值的组合是有望同时揭示AGN、恒星形成和激波相对作用的诊断方法。要正确识别主导电离源,需要利用基于先进统计技术以及空间分辨数据的分析工具。

英文摘要:

Line ratio diagnostics provide valuable clues on the source of ionizing radiation in galaxies with intense black hole accretion and starbursting events, such as local Seyfert or galaxies at the peak of the star formation history. We aim to provide a reference joint optical and mid-IR analysis for studying AGN identification via line ratios and testing predictions from photoionization models. We obtained homogenous optical spectra with the Southern Africa Large Telescope for 42 Seyfert galaxies with Spitzer/IRS spectroscopy and X-ray to mid-IR multiband data available. After confirming the power of the main optical ([OIII]) and mid-IR ([NeV], [OIV], [NeIII]) emission lines in tracing AGN activity, we explore diagrams based on ratios of optical and mid-IR lines by exploiting photoionization models of different ionizing sources (AGN, star formation and shocks). We find that pure AGN photoionization models are good at reproducing observations of Seyfert galaxies with an AGN fractional contribution to the mid-IR (5-40 micron) emission larger than 50 per cent. For targets with a lower AGN contribution these same models do not fully reproduce the observed mid-IR line ratios. Mid-IR ratios like [NeV]/[NeII], [OIV]/[NeII] and [NeIII]/[NeII] show a dependence on the AGN fractional contribution to the mid-IR unlike optical line ratios. An additional source of ionization, either from star formation or radiative shocks, can help explain the observations in the mid-IR. Among combinations of optical and mid-IR diagnostics in line ratio diagrams, only those involving the [OI]/Halpha ratio are promising diagnostics for simultaneously unraveling the relative role of AGN, star formation and, shocks. A proper identification of the dominant ionizing source would require the exploitation of analysis tools based on advanced statistical techniques as well as spatially resolved data.

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。

↑