arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1706.09759astro-ph.GA
收藏

三个窄线Seyfert 1星系的红化和He I ~* $\lambda10830$吸收线

Reddening and He I* $\lambda10830$ Absorption Lines in Three Narrow-line Seyfert 1 Galaxies

Shaohua Zhang, Hongyan Zhou, Xiheng Shi, Wenjuan Liu, Xiang Pan, Ning Jiang, Tuo Ji, Peng Jiang, Shufen Wang

摘要:

本文报道了在三个窄线Seyfert 1星系SDSS J091848.61+211717.0、SDSS J111354.66+124439.0和SDSS J122749.13+321458.9中活动星系核红移处的重红化和He I* $\lambda10830$吸收线的探测结果。它们呈现非常红的光学到近红外的颜色,窄的Balmer/Paschen宽发射线和He I* $\lambda10830$吸收线。三个天体的紫外-光学-红外核连续体被SMC消光定律红化,分别为$E(B-V)\sim 0.74$、1.17和1.24等,这与宽谱线的巴耳末衰减值高度一致,但大于窄谱线的值。红化分析表明,灭绝尘埃同时掩盖了吸积盘、宽发射线区域和来自环内侧边缘的热尘埃。遮蔽活动星系核结构的尘埃可能就是尘埃环本身。对He I ~* $\lambda10830$吸收谱线的Cloudy分析表明,吸收物质的距离是环面的延伸尺度。这大大增加了模糊和吸收物质是尘埃环的可能性。

英文摘要:

We report the detection of heavy reddening and the He I* $\lambda10830$ absorption lines at the AGNs' redshift in three Narrow-line Seyfert 1 galaxies: SDSS J091848.61+211717.0, SDSS J111354.66+124439.0, and SDSS J122749.13+321458.9. They exhibit very red optical to near-infrared colors, narrow Balmer/Paschen broad emission lines and He I* $\lambda10830$ absorption lines. The ultraviolet-optical-infrared nucleus continua are reddened by the SMC extinction law of $E(B-V)\sim 0.74$, 1.17, and 1.24 mag for three objects, which are highly consistent with the values obtained from the broad-line Balmer decrements, but larger than those of narrow emission lines. The reddening analysis suggests the extinction dust simultaneously obscure the accretion disk, the broad emission line region, and the hot dust from the inner edge of the torus. It is possible that the dust obscuring the AGN structures are the dusty torus itself. Furthermore, the Cloudy analysis of the He I* $\lambda10830$ absorption lines propose the distance of the absorption materials to be the extend scale of the torus. That greatly increases probabilities of the obscure and absorption materials being the dusty torus.

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。

↑