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arXiv 2510.09830astro-ph.GAastro-ph.HE
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GATOS IX:JWST/MIRI近邻塞弗特星系图像中发射线污染的详细评估与处理

GATOS IX: A Detailed Assessment and Treatment of Emission Line Contamination in JWST/MIRI Images of Nearby Seyfert Galaxies

Steph Campbell, David J. Rosario, Houda Haidar, Enrique López Rodríguez, Dan Delaney, Erin Hicks, Ismael García-Bernete, Miguel Pereira-Santaella, Almudena Alon… 展开作者

Steph Campbell, David J. Rosario, Houda Haidar, Enrique López Rodríguez, Dan Delaney, Erin Hicks, Ismael García-Bernete, Miguel Pereira-Santaella, Almudena Alonso Herrero, Anelise Audibert, Enrica Bellocchi, Donaji Esparza-Arredondo, Santiago García-Burillo, Omaira González Martín, Sebastian F. Hönig, Nancy A. Levenson, Chris Packham, Cristina Ramos Almeida, Dimitra Rigopoulou, Lulu Zhang

AI总结:

本文利用JWST/MIRI成像和MRS光谱研究11个近邻塞弗特星系,发现去除发射线污染后延展中红外发射仍存在数百秒差距,污染程度因天体和波段而异,并验证了仅用单一数据估算污染的方法误差在10个百分点内。

摘要:

高空间分辨率的宽视场中红外(MIR)成像有助于研究近邻AGN核周区域的延展尘埃结构。然而,宽视场成像滤光片无法区分尘埃连续谱发射与发射线,因此在研究这些环境中的延展尘埃时,处理发射线污染变得至关重要。本文作为Galactic Activity, Torus and Outflow Survey (GATOS)的一部分,使用了来自JWST/MIRI的Cycle 1中红外成像数据和JWST/MRS的光谱数据,研究了11个近邻塞弗特星系。其中三个天体(NGC 3081、NGC 5728和NGC 7172)同时存在于两个数据集中,从而允许利用这些天体的光谱直接测量发射线。我们发现,在去除发射线污染后,延展的中红外发射仍然存在于数百秒差距的尺度上。此外,不同天体间(在F1000W滤光片中从5%到30%)以及不同滤光片间的发射线污染程度差异很大,因此无法在整个样本中进行推广,必须针对每个天体和波段进行仔细处理。我们还测试了在仅有MRS光谱或MIRI成像可用时,利用JWST之前的辅助数据来估算发射线污染的方法。我们发现这些方法估算污染的误差在10个百分点以内。本文为在MIRI宽视场成像中量化和减轻发射线污染的方法提供了有用的指南。

英文摘要:

Broadband mid-infrared (MIR) imaging with high spatial resolution is useful to study extended dust structures in the circumnuclear regions of nearby AGN. However, broadband imaging filters cannot distinguish dust continuum emission from emission lines, and so accounting for the emission line contamination becomes crucial in studying extended dust in these environments. This paper uses Cycle 1 MIR imaging from JWST/MIRI and spectroscopy from JWST/MRS for 11 local Seyfert galaxies, as part of the Galactic Activity, Torus and Outflow Survey (GATOS). Three of the objects (NGC 3081, NGC 5728, and NGC 7172) exist in both datasets, allowing direct measurement of the line emission using the spectroscopy for these objects. We find that extended MIR emission persists on scales of 100s of parsecs after the removal of contamination from emission lines. Further, the line contamination levels vary greatly between objects (from 5% to 30% in the F1000W filter), and across filters, so cannot be generalised across a sample and must be carefully treated for each object and band. We also test methods to estimate the line contamination when only MRS spectroscopy or MIRI imaging is available, using pre-JWST ancillary data. We find that these methods estimate the contamination within 10 percentage points. This paper serves as a useful guide for methods to quantify and mitigate for emission line contamination in MIRI broadband imaging

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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