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arXiv 1502.06548astro-ph.GA
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100 Mpc以上星系中的DIB映射。AM 1353-272 B中$λ$ 5780.5弥散星际带的径向轮廓

Towards DIB mapping in galaxies beyond 100 Mpc. A radial profile of the $λ$5780.5 diffuse interstellar band in AM 1353-272 B

Ana Monreal-Ibero, Peter M. Weilbacher, Martin Wendt, Fernando Selman, Rosine Lallement, Jarle Brinchmann, Sebastian Kamann, Christer Sandin

摘要:

星际弥散带(DIB)是通过一个或多个星际介质(ISM)云观测恒星光谱时发现的来源不明的非恒星弱吸收特征。目前对银河系以外的DIB的研究非常有限。据我们所知,对本地集团以外的DIB进行的具体空间分辨调查是不存在的。在这里,我们探讨的能力,高灵敏度的积分场摄谱仪,MUSE,作为一种工具,以映射弥漫的星际带的距离大于100兆秒差距。我们使用MUSE调试数据AM 1353-272 B,成员与最高的灭绝的“牙医的椅子”,两个螺旋星系的相互作用系统。高信号噪声谱是通过将分布在同心椭圆半环几何形状中的许多空间元素的信号相加而产生的。我们推导出的$λ$ 5780.5 DIB的等效宽度的减少径向配置文件在后退和接近侧的同伴星系的距离为$\sim$ 4.6千秒差距从星系的中心。同样地,从H α/H β谱线比率推导出的星际消光也显示出类似的趋势,其值向外部部分递减。这转化为DIB的强度和AM 1353-272 B内的灭绝之间的内在相关性,与使用银河系和河外视线测量时这些数量之间的当前现有全球趋势一致。到目前为止,在本机宇宙中绘制DIB强度似乎是可行的。这提供了一种新的方法来研究在不同的条件下,如在我们的银河系中发现的,以使用本星系群中的星系和/或单一的视线对超新星,类星体和本星系群以外的星系之间的关系DIBs和ISM的其他特征和种类。

英文摘要:

Diffuse Interstellar Bands (DIBs) are non-stellar weak absorption features of unknown origin found in the spectra of stars viewed through one or several clouds of Interstellar Medium (ISM). Research of DIBs outside the Milky Way is currently very limited. Specifically spatially resolved investigations of DIBs outside of the Local Group is, to our knowledge, inexistent. Here, we explore the capability of the high sensitivity Integral Field Spectrograph, MUSE, as a tool to map diffuse interstellar bands at distances larger than 100 Mpc. We use MUSE commissioning data for AM 1353-272 B, the member with highest extinction of the "The Dentist's Chair", an interacting system of two spiral galaxies. High signal-to-noise spectra were created by co-adding the signal of many spatial elements distributed in a geometry of concentric elliptical half-rings. We derived decreasing radial profiles for the equivalent width of the $λ$5780.5 DIB both in the receding and approaching side of the companion galaxy up to distances of $\sim$4.6 kpc from the center of the galaxy. Likewise, interstellar extinction, as derived from the Halpha/Hbeta line ratio displays a similar trend, with decreasing values towards the external parts. This translates into an intrinsic correlation between the strength of the DIB and the extinction within AM 1353-272 B consistent with the current existing global trend between these quantities when using measurements for both Galactic and extragalactic sight lines. Mapping of DIB strength in the Local Universe as up to now only done for the Milky Way seems feasible. This offers a new approach to study the relationship between DIBs and other characteristics and species of the ISM in different conditions as those found in our Galaxy to the use of galaxies in the Local Group and/or single sightlines towards supernovae, quasars and galaxies outside the Local Group.

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