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arXiv 0911.3897astro-ph.GA
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弱Seyfert Galerkin中中性气体的流出和流入

Neutral Gas Outflows and Inflows in Infrared-Faint Seyfert Galaxies

Hannah B. Krug, David S. N. Rupke, Sylvain Veilleux

摘要:

先前对Na I D星际吸收线二重态的研究表明,在大多数具有高红外光度的星系中都存在星系风。然而,在星暴与活动星系核(AGN)共存的红外明亮复合系统中,尚不清楚是星暴、活动星系核还是两者都在驱动外流。本文描述了在35颗红外暗Seyferts中寻找外流的结果,这些西弗ts的亮度为10^9.9 < L_IR/L_sun < 10^11,或相当于恒星形成率(SFR)为~0.4 - 9太阳质量/年,试图分离出外流的来源。我们发现,红外微弱的Seyfert 1 s(6%)和Seyfert 2s(18%)的流出检测率低于以前报道的红外发光的Seyfert 1 s(50%)和Seyfert 2s(45%)。红外微弱和红外明亮的塞弗特2星系的外流运动学类似于星暴星系,而在塞弗特1星系的外流速度显着较大。综上所述,这些结果表明,活动星系核并没有发挥显着的作用,在大多数红外微弱和红外明亮的系统,除了在塞弗特1星系中看到的高速外流驱动外流。这项研究的另一个惊人的结果是红外微弱星系中的流入检测率很高(39%的Seyfert 1,35%的Seyfert 2),明显大于红外发光的Seyfert(15%)。这种流入可能有助于这些星系中活动星系核的馈送,并可能提供足够的物质来为在典型的活动星系核寿命期间观察到的核活动提供动力。

英文摘要:

Previous studies of the Na I D interstellar absorption line doublet have shown that galactic winds occur in most galaxies with high infrared luminosities. However, in infrared-bright composite systems where a starburst coexists with an active galactic nucleus (AGN), it is unclear whether the starburst, the AGN, or both are driving the outflows. The present paper describes the results from a search for outflows in 35 infrared-faint Seyferts with 10^9.9 < L_IR/L_sun < 10^11, or, equivalently, star formation rates (SFR) of ~0.4 -- 9 solar masses per year, to attempt to isolate the source of the outflow. We find that the outflow detection rates for the infrared-faint Seyfert 1s (6%) and Seyfert 2s (18%) are lower than previously reported for infrared-luminous Seyfert 1s (50%) and Seyfert 2s (45%). The outflow kinematics of infrared-faint and infrared-bright Seyfert 2 galaxies resemble those of starburst galaxies, while the outflow velocities in Seyfert 1 galaxies are significantly larger. Taken together, these results suggest that the AGN does not play a significant role in driving the outflows in most infrared-faint and infrared-bright systems, except the high-velocity outflows seen in Seyfert 1 galaxies. Another striking result of this study is the high rate of detection of inflows in infrared-faint galaxies (39% of Seyfert 1s, 35% of Seyfert 2s), significantly larger than in infrared-luminous Seyferts (15%). This inflow may be contributing to the feeding of the AGN in these galaxies, and potentially provides more than enough material to power the observed nuclear activity over typical AGN lifetimes.

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