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arXiv 2409.05686astro-ph.GAastro-ph.CO
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星系活动、环面和外流巡天(GATOS)。V:利用JWST揭示AGN核周区域中PAH的存留与韧性

The Galaxy Activity, Torus, and Outflow Survey (GATOS). V: Unveiling PAH survival and resilience in the circumnuclear regions of AGN with JWST

I. García-Bernete, D. Rigopoulou, F. R. Donnan, A. Alonso-Herrero, M. Pereira-Santella, T. Shimizu, R. Davies, P. F. Roche, S. García-Burillo, A. Labiano, L. He… 展开作者

I. García-Bernete, D. Rigopoulou, F. R. Donnan, A. Alonso-Herrero, M. Pereira-Santella, T. Shimizu, R. Davies, P. F. Roche, S. García-Burillo, A. Labiano, L. Hermosa Muñoz, L. Zhang, A. Audibert, E. Bellocchi, A. Bunker, F. Combes, D. Delaney, D. Esparza-Arredondo, P. Gandhi, O. González-Martín, S. F. Hönig, M. Imanishi, E. K. S. Hicks, L. Fuller, M. Leist, N. A. Levenson, E. Lopez-Rodriguez, C. Packham, C. Ramos Almeida, C. Ricci, M. Stalevski, M. Villar Martín, M. J. Ward

AI总结:

本研究利用JWST观测数据分析了GATOS巡天中AGN核周区域的PAH性质,发现AGN的反馈和照射会显著影响kpc尺度内的PAH电离态,且电离PAH谱带韧性较差,在强AGN耦合系统中作为恒星形成率指标时需谨慎使用。

摘要:

我们分析了来自GATOS Survey的JWST MIRI/MRS对本地AGN核区及核周区域红外PAH谱带的观测数据。在本工作中,我们考察了AGN及AGN外流的核周区域中的PAH性质,并将其与恒星形成区以及AGN最内核区域的性质进行了比较。本研究采用4.9-28.1微秒的亚角秒角分辨率数据,探究了三个近邻源(距离DL~30-40 Mpc)中PAH的性质。我们的发现与以往的JWST研究一致,表明与恒星形成星系相比,AGN中心区域显示出更大比例的中性PAH分子(即11.3/6.2和11.3/7.7 PAH比值升高)。我们发现AGN可能不仅影响最内核区域的PAH种群,还会影响延伸至~kpc尺度的区域。通过将我们的观测与PAH诊断图进行比较,我们发现,总体而言,位于AGN外流投影方向上的区域在PAH诊断图上占据的位置与AGN最内核区域相似。这些星系中未受AGN影响的恒星形成区在诊断图上与恒星形成星系占据相同区域。我们检验了PAH-H2图在区分AGN与恒星形成活动方面的潜力。我们的结果表明,在Sy型AGN中,AGN的照射和反馈可能影响核区及kpc尺度的PAH种群,特别是PAH尘埃的电离态。然而,PAH的尺寸相当相似。电离PAH谱带(6.2和7.7微米)的载体的韧性不如中性PAH谱带(11.3微米)的载体,这对于强AGN-宿主耦合系统可能尤为重要。因此,在这些系统中即使是在kpc尺度上使用PAH谱带作为恒星形成率指标时也必须谨慎,因为电离态的PAH受AGN影响更大。

英文摘要:

We analyze JWST MIRI/MRS observations of the infrared PAH bands in the nuclear and circumnuclear regions of local AGN from the GATOS Survey. In this work, we examine the PAH properties in the circumnuclear regions of AGN and AGN-outflows, and compare them to those in star-forming regions and the innermost regions of AGN. This study employs 4.9-28.1 micron sub-arcsecond angular resolution data to investigate the properties of PAH in three nearby sources (DL~30-40 Mpc). Our findings align with previous JWST studies, showing that the central regions of AGN show a larger fraction of neutral PAH molecules (i.e. elevated 11.3/6.2 and 11.3/7.7 PAH ratios) compared to star-forming galaxies. We find that the AGN might affect not only the PAH population in the innermost region but also in the extended regions up to ~kpc scales. By comparing our observations to PAH diagnostic diagrams, we find that, in general, regions located in the projected direction of the AGN-outflow occupy similar positions on the PAH diagnostic diagrams as those of the innermost regions of AGN. Star-forming regions that are not affected by the AGN in these galaxies share the same part of the diagram as Star-forming galaxies. We examine the potential of the PAH-H2 diagram to disentangle AGN versus star-forming activity. Our results suggest that in Sy-like AGN, illumination and feedback from the AGN might affect the PAH population at nuclear and kpc scales, in particular, the ionization state of the PAH grains. However, PAH sizes are rather similar. The carriers of the ionized PAH bands (6.2 and 7.7 micron) are less resilience than those of neutral PAH bands (11.3 micron), which might be particularly important for strongly AGN-host coupled systems. Therefore, caution must be applied when using PAH bands as star-formation rate indicators in these systems even at kpc scales, with the ionized ones being more affected by the AGN.

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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