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arXiv 1708.08461astro-ph.GA
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z $\sim$ 1射电巨星系的恒星动力学和恒星形成历史

Stellar Dynamics and Star-Formation Histories of z $\sim$ 1 Radio-loud Galaxies

Ivana Barišić, Arjen van der Wel, Rachel Bezanson, Camilla Pacifici, Kai Noeske, Juan C. Muñoz - Mateos, Marijn Franx, Vernesa Smolčić, Eric F. Bell, Gabriel Br… 展开作者

Ivana Barišić, Arjen van der Wel, Rachel Bezanson, Camilla Pacifici, Kai Noeske, Juan C. Muñoz - Mateos, Marijn Franx, Vernesa Smolčić, Eric F. Bell, Gabriel Brammer, João Calhau, Priscilla Chauké, Pieter G. van Dokkum, Josha van Houdt, Anna Gallazzi, Ivo Labbé, Michael V. Maseda, Adam Muzzin, David Sobral, Caroline Straatman, Po-Feng Wu

摘要:

本文研究了58个中等光度射电噪星系(L $_{3 GHz}$ $>$ 10 $^{23}$ W Hz $^{-1}$)在0.6 < z < 1时的恒星运动学和恒星布居。这个样本是由交叉匹配的星系从深VLT/VIMOS LEGA-C光谱调查与VLA 3 GHz数据集。LEGA-C连续谱首次揭示了z $\sim$ 1射电星系的恒星速度色散和年龄指标。我们发现,$z\sim 1$射电响亮AGN只发生在主要是老星系的高速色散:$σ_*>$ 175公里秒$^{-1}$,对应的黑洞质量超过$10^8$ M $_{\odot}$。此外,我们确认,在一个固定的恒星质量的无线电响亮AGN的分数在z $\sim$ 1是5 - 10倍高于当地的宇宙,这表明,静止的,大质量的星系在z $\sim$ 1开关作为无线电AGN平均每陀螺仪一次。我们的研究结果加强了现有的证据之间的联系高黑洞质量,射电响度和静止在z $\sim$ 1。

英文摘要:

We investigate the stellar kinematics and stellar populations of 58 radio-loud galaxies of intermediate luminosities (L$_{3 GHz}$ $>$ 10$^{23}$ W Hz$^{-1}$ ) at 0.6 < z < 1. This sample is constructed by cross-matching galaxies from the deep VLT/VIMOS LEGA-C spectroscopic survey with the VLA 3 GHz dataset. The LEGA-C continuum spectra reveal for the first time stellar velocity dispersions and age indicators of z $\sim$ 1 radio galaxies. We find that $z\sim 1$ radio-loud AGN occur exclusively in predominantly old galaxies with high velocity dispersions: $σ_*>$ 175 km s$^{-1}$, corresponding to black hole masses in excess of $10^8$ M$_{\odot}$. Furthermore, we confirm that at a fixed stellar mass the fraction of radio-loud AGN at z $\sim$ 1 is 5 - 10 times higher than in the local universe, suggesting that quiescent, massive galaxies at z $\sim$ 1 switch on as radio AGN on average once every Gyr. Our results strengthen the existing evidence for a link between high black-hole masses, radio loudness and quiescence at z $\sim$ 1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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