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arXiv 2103.08502astro-ph.GA
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AGN附近中性流入和流出中空间分辨的气体和尘埃联系

The spatially-resolved gas and dust connection in neutral inflows and outflows in nearby AGN

David S. N. Rupke, Adam D. Thomas, Michael A. Dopita

摘要:

尘埃,中性的流出和流入是附近恒星形成星系的共同特征。我们在8个星系-主要是活动星系核-这些流量的特点,选择他们广泛的NaI D签名从赛丁泉南塞弗特光谱快照调查(S7)。这项调查采用深,宽视场积分场光谱学在中等光谱分辨率(R=7000在NaI D)。我们显着扩大样本的视线在外部星系中的冷,中性气体的属性- N(NaI),Weq(NaI D)-和尘埃- E(B-V)从恒星和气体之间的空间分辨关系进行了研究。我们的样本显示出强的,显着的相关性,总Weq与E(B-V)_星和g-i颜色在个别星系;相关性与E(B-V)_气体存在,但较弱。回归得出星系间的斜率变化和内在散射~1埃。该样品占据了N(NaI)和Weq^abs与E(B-V)_gas空间中的区域,这与从其他研究外推到更高的颜色过量[E(B-V)_gas ~ 1]一致。也许是第一次在外部星系中,我们发现逆P天鹅座配置文件中的NaI D线,大概是由于流入的气体。通过多普勒频移的NaI D吸收和发射线,我们发现无处不在的流动与恒星旋转的差异大于100 km/s,或者具有|v,abs - v,em|> 100 km/s。流入流和流出流向探测到的恒星盘/FOV的边缘延伸,共同对着投影盘的10-40%,并且具有相似的平均N(NaI)和Weq(NaI D)。流出与短轴或射流驱动的流动一致,而流入则倾向于预测的长轴。流入可能是由非轴对称势、潮汐运动或晕落引起的。

英文摘要:

Dusty, neutral outflows and inflows are a common feature of nearby star-forming galaxies. We characterize these flows in eight galaxies -- mostly AGN -- selected for their widespread NaI D signatures from the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7). This survey employs deep, wide field-of-view integral field spectroscopy at moderate spectral resolution (R=7000 at NaI D). We significantly expand the sample of sightlines in external galaxies in which the spatially-resolved relationship has been studied between cool, neutral gas properties -- N(NaI), Weq(NaI D) -- and dust -- E(B-V) from both stars and gas. Our sample shows strong, significant correlations of total Weq with E(B-V)_stars and g-i colour within individual galaxies; correlations with E(B-V)_gas are present but weaker. Regressions yield slope variations from galaxy to galaxy and intrinsic scatter ~1 Angstrom. The sample occupies regions in the space of N(NaI) and Weq^abs vs. E(B-V)_gas that are consistent with extrapolations from other studies to higher colour excess [E(B-V)_gas ~ 1]. For perhaps the first time in external galaxies, we detect inverse P Cygni profiles in the NaI D line, presumably due to inflowing gas. Via Doppler shifted NaI D absorption and emission lines, we find ubiquitous flows that differ from stellar rotation by >100 km/s or have |v,abs - v,em| > 100 km/s. Inflows and outflows extend toward the edge of the detected stellar disk/FOV, together subtend 10-40% of the projected disk, and have similar mean N(NaI) and Weq(NaI D). Outflows are consistent with minor-axis or jet-driven flows, while inflows tend toward the projected major axis. The inflows may result from non-axisymmetric potentials, tidal motions, or halo infall.

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