窄带区光电离模型的温度差异

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Revista Mexicana de Astronomia y Astrofisica Pub Date : 2021-12-17 DOI:10.22201/ia.01851101p.2022.58.01.11

L. Binette, Montserrat Villar Mart'in, C. GladisMagris, Mariela Mart'inez-Paredes, A. Alarie, A. Ardila, I. Villicaña-Pedraza

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引用次数: 1

摘要

利用已发表的关于活动星系核窄线区域的研究成果，对类星体、Seyfert 2和空间分辨的ENLR等离子体中观测到的[OIII] λ4363Å/5007Å比值(ROIII)进行了比较。利用Koski(1978)在Seyfert 2中观测到的弱[ArIV] λ4711Å/λ4740Å双重态，我们发现了一个由低密度发射云(小于104 cm-3)组成的窄线区(NLR)的证据。在考虑了假设等离子体密度幂律分布的[Ar]和[OIII]比值计算后，没有发现碰撞去激发的证据。推断的等离子体温度为13500°K，用标准的光电离计算再现是有问题的。对于ENLR和Seyfert 2测量的ROIII比率接近重合(ROIII≃0.017)的最简单解释是两个等离子体都处于低密度状态。

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TEMPERATURE DISCREPANCY WITH PHOTOIONIZATION MODELS OF THE NARROW-LINE REGION

Using published work on the narrow-line region of Active Galactic Nuclei, a comparison is carried out among the [OIII] λ4363Å/5007Å ratios (ROIII) observed in quasars, Seyfert 2's and the spatially resolved ENLR plasma. Using the weak [ArIV] λ4711Å/λ4740Å doublet observed by Koski (1978) among Seyfert 2's, we find evidence of a Narrow-Line Region (NLR) populated by low density emission clouds (≲ 104 cm-3). After considering calculations of the [Ar] and [OIII] ratios that assume a powerlaw distribution of plasma densities, no evidence of collisional deexcitation is found. The plasma temperature that is inferred is 13 500 °K, which is problematic to reproduce with standard photoionization calculations. The simplest interpretation for the near coincidence of the ROIII ratios among the ENLR and Seyfert 2 measurements (ROIII ≃ 0.017) is that the low density regime applies to both plasmas.

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来源期刊

Revista Mexicana de Astronomia y Astrofisica 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Revista Mexicana de Astronomía y Astrofísica, founded in 1974, publishes original research papers in all branches of astronomy, astrophysics and closely related fields. Two numbers per year are issued and are distributed free of charge to all institutions engaged in the fields covered by the RMxAA.