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arXiv 1609.04832astro-ph.GA
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在SDSS的主要合并和相互作用中WISE选择的遮蔽活动星系核的发生率

Incidence of WISE-Selected Obscured AGNs in Major Mergers and Interactions from the SDSS

Madalyn E. Weston, Daniel H. McIntosh, Mark Brodwin, Justin Mann, Andrew Cooper, Adam McConnell, Jennifer L. Nielsen

摘要:

我们使用宽视场红外巡天探测器(WISE)和斯隆数字巡天(SDSS)来确认尘埃遮蔽的活动星系核(AGN)和星系合并之间的联系。使用一种新的、容量有限的(z <= 0.08)从SDSS中视觉选择的主要合并和星系-星系相互作用的目录,恒星质量超过2 × 10^10 Msun,我们发现主要合并(相互作用)是5-17(3-5)倍更有可能有红色[3.4]-[4.6]颜色与尘埃遮蔽或“尘埃”AGN,与质量相近的非合并星系相比。使用已发表的光纤光谱诊断,我们绘制了不同发射线星系的[3.4]-[4.6]与[4.6]-[12]颜色,并发现四分之一的Seyferts具有指示尘埃AGN的颜色。我们发现,活动星系核是五倍更有可能被掩盖时,主办的合并星系,一半的活动星系核主办的合并是尘土飞扬的,我们没有发现光学活动星系核合并的频率增强非合并星系。我们的结论是,未被发现的活动星系核错过了在较短的波长是正在进行的活动星系核合并连接辩论的核心。绝大多数尘埃活动星系核的合并都是恒星形成的,并且位于Mhalo<10^13 Msun群的中心。假设持续时间短的尘埃活动星系核阶段,我们推测,大部分的气体丰富的合并经验,一个简短的模糊活动星系核阶段,在中央恒星形成和黑洞增长之间的强连接合并模拟中看到的协议。

英文摘要:

We use the Wide-field Infrared Survey Explorer (WISE) and the Sloan Digital Sky Survey (SDSS) to confirm a connection between dust-obscured active galactic nuclei (AGNs) and galaxy merging. Using a new, volume-limited (z <= 0.08) catalog of visually-selected major mergers and galaxy-galaxy interactions from the SDSS, with stellar masses above 2x10^10 Msun, we find that major mergers (interactions) are 5-17 (3-5) times more likely to have red [3.4]-[4.6] colors associated with dust-obscured or `dusty' AGNs, compared to non-merging galaxies with similar masses. Using published fiber spectral diagnostics, we map the [3.4]-[4.6] versus [4.6]-[12] colors of different emission-line galaxies and find one-quarter of Seyferts have colors indicative of a dusty AGN. We find that AGNs are five times more likely to be obscured when hosted by a merging galaxy, half of AGNs hosted by a merger are dusty, and we find no enhanced frequency of optical AGNs in merging over non-merging galaxies. We conclude that undetected AGNs missed at shorter wavelengths are at the heart of the ongoing AGN-merger connection debate. The vast majority of mergers hosting dusty AGNs are star-forming and located at the centers of Mhalo<10^13 Msun groups. Assuming plausibly short duration dusty-AGN phases, we speculate that a large fraction of gas-rich mergers experience a brief obscured AGN phase, in agreement with the strong connection between central star formation and black hole growth seen in merger simulations.

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