Halo ejection in distant radio galaxies: jet feedback in massive galaxy formation
Halo ejection in distant radio galaxies: jet feedback in massive galaxy formation
复制标题
遥远射电星系中的晕抛射：大质量星系形成中的射流反馈
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Bunker
中科院分区：
文献类型：
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作者：
M. Dopita;M. Reuland;W. Breugel;W. Vries;S. Stanford;H. Röttgering;G. Miley;B. Venemans;H. Spinrad;S. Dawson;A. Dey;M. Lacy;D. Stern;A. Bunker
摘要
本文介绍了对z>3高红移射电星系4C 41.17、4C 60.07和B2 0902+34的巨发射线晕进行Keck光学和近红外光谱研究的结果。这些晕的外部区域表现出安静的运动学，典型的速度色散为几百km s−1，速度切变与旋转一致。内部区域包含与射电叶密切相关的激波、团块状气体茧，其运动学和膨胀速度和/或速度色散大于1000 km s−1。我们还发现了证据，为喷射的化学富集的材料在4C 41.17高达一个距离为1060千秒差距沿着的放射性轴。我们推断，这些HiZRG正在经历一个最后的喷流诱导阶段的星星形成与喷射的大部分星际介质之前，演变成“红色和死亡”的椭圆星系。
Abstract
We present results from a Keck optical and near IR spectroscopic study of the giant emission line halos of the z>3 High Redshift Radio Galaxies (HiZRGs) 4C 41.17, 4C 60.07 and B2 0902+34. The outer regions of these halos show quiet kinematics with typical velocity dispersions of a few hundred km s−1 and velocity shears consistent with rotation. The inner regions contain shocked, clumpy cocoons of gas closely associated with the radio lobes with disturbed kinematics and expansion velocities and/or velocity dispersions >1000 km s−1. We also find evidence for the ejection of chemically enriched material in 4C 41.17 up to a distance of ∼60 kpc along the radio-axis. We infer that these HiZRGs are undergoing a final jet-induced phase of star formation with the ejection of most of their interstellar medium before evolving to become “red and dead” Elliptical galaxies.