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arXiv 1406.0183astro-ph.GAastro-ph.CO
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最大质量z~1-2恒星形成星系中广泛分布的AGN驱动外流的证据

Evidence for Wide-Spread AGN Driven Outflows in the Most Massive z~1-2 Star Forming Galaxies

R. Genzel, N. M. Förster Schreiber, D. Rosario, P. Lang, D. Lutz, E. Wisnioski, E. Wuyts, S. Wuyts, K. Bandara, R. Bender, S. Berta, J. Kurk, J. T. Mendel, L. J… 展开作者

R. Genzel, N. M. Förster Schreiber, D. Rosario, P. Lang, D. Lutz, E. Wisnioski, E. Wuyts, S. Wuyts, K. Bandara, R. Bender, S. Berta, J. Kurk, J. T. Mendel, L. J. Tacconi, D. Wilman, A. Beifiori, G. Brammer, A. Burkert, P. Buschkamp, J. Chan, C. M. Carollo, R. Davies, F. Eisenhauer, M. Fabricius, M. Fossati, M. Kriek, S. Kulkarni, S. J. Lilly, C. Mancini, I. Momcheva, T. Naab, E. J. Nelson, A. Renzini, R. Saglia, R. M. Sharples, A. Sternberg, S. Tacchella, P. van Dokkum

摘要:

本文是对Forster Schreiber等人在最大质量(log(M*/Msun)>= 10.9)z~1-3恒星形成星系中探测到的核电离外流的进一步研究。通过将样本量增加6倍(log(M*/Msun)>= 10.9以上的星系增加到44个),这些样本来自于联合使用的射电/zC-SINF、LUCI、GNIRS和KMOS ^-3D光谱巡天。我们发现了一个相当尖锐的宽核发射(在Ha,[NII]和[SII]线的FWHM ~ 450-5300 km/s)的发病率,与大[NII]/Ha的比率,以上log(M*/Msun)~ 10.9,约三分之二的星系在这个质量范围内表现出这一组成部分。在谢克特质量附近和以上的广核成分在恒星形成星系的主序列之上和之下以及z~1和z ~2处同样普遍存在。核成分的线比由活动星系核(AGN)的激发,或由冲击和光电离的组合来拟合。具有广泛核成分的最大质量星系的发生率至少与通过X射线、光学、红外或射电指标确定的活动星系核一样大。核外流的质量负荷接近于1。我们的研究结果提供了令人信服的证据,强大的,高占空比,活动星系核驱动的外流附近的谢克特质量,并采取行动的宇宙星系形成的高峰。

英文摘要:

In this paper we follow up on our previous detection of nuclear ionized outflows in the most massive (log(M*/Msun) >= 10.9) z~1-3 star-forming galaxies (Forster Schreiber et al.), by increasing the sample size by a factor of six (to 44 galaxies above log(M*/Msun) >= 10.9) from a combination of the SINS/zC-SINF, LUCI, GNIRS, and KMOS^3D spectroscopic surveys. We find a fairly sharp onset of the incidence of broad nuclear emission (FWHM in the Ha, [NII], and [SII] lines ~ 450-5300 km/s), with large [NII]/Ha ratios, above log(M*/Msun) ~ 10.9, with about two thirds of the galaxies in this mass range exhibiting this component. Broad nuclear components near and above the Schechter mass are similarly prevalent above and below the main sequence of star-forming galaxies, and at z~1 and ~2. The line ratios of the nuclear component are fit by excitation from active galactic nuclei (AGN), or by a combination of shocks and photoionization. The incidence of the most massive galaxies with broad nuclear components is at least as large as that of AGNs identified by X-ray, optical, infrared or radio indicators. The mass loading of the nuclear outflows is near unity. Our findings provide compelling evidence for powerful, high-duty cycle, AGN-driven outflows near the Schechter mass, and acting across the peak of cosmic galaxy formation.

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