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arXiv 2102.04520astro-ph.COastro-ph.GA
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在QUIJOTE宇宙学场中明亮致密源的28 - 40 GHz变化和偏振测量

28 -- 40 GHz variability and polarimetry of bright compact sources in the QUIJOTE cosmological fields

Yvette C. Perrott, Marcos López-Caniego, Ricardo T. Génova-Santos, Jose Alberto Rubiño-Martín, Mark Ashdown, Diego Herranz, Anne Lähteenmäki, Anthony N. Lasenby… 展开作者

Yvette C. Perrott, Marcos López-Caniego, Ricardo T. Génova-Santos, Jose Alberto Rubiño-Martín, Mark Ashdown, Diego Herranz, Anne Lähteenmäki, Anthony N. Lasenby, Carlos H. López-Caraballo, Frédérick Poidevin, Merja Tornikoski

摘要:

我们在普朗克点源目录(第1版)中的Q-U-I JOint TENERIFE(QUIJOTE)宇宙场中观察到51个在30 GHz处亮度超过1 Jy的源,在28 - 40 GHz处使用超大阵列,以确定它们的高射频可变性和偏振特性。我们发现一个大致的对数正态分布的极化分数的中位数为2%,与以前的研究一致,和一个中位数旋转措施(RM)的$\approx$ 1110拉德米$^{-2}$与一个离群值高达$\approx$ 64000拉德米$^{-2}$,这是类星体核心中测得的最高RM。我们发现总强度通量密度和中值偏振分数之间的相关性的提示。我们发现在$3σ$水平上,59%的光源的总强度是可变的,100%的光源的偏振是可变的,总强度可变性和偏振可变性之间没有明显的相关性。这表明,如果没有同步的偏振监测观测,将很难对这些源进行建模,并且它们需要被掩蔽以进行宇宙学分析。

英文摘要:

We observed 51 sources in the Q-U-I JOint TEnerife (QUIJOTE) cosmological fields which were brighter than 1 Jy at 30 GHz in the Planck Point Source Catalogue (version 1), with the Very Large Array at 28 -- 40 GHz, in order to characterise their high-radio-frequency variability and polarization properties. We find a roughly log-normal distribution of polarization fractions with a median of 2%, in agreement with previous studies, and a median rotation measure (RM) of $\approx$ 1110 rad m$^{-2}$ with one outlier up to $\approx$ 64000 rad m$^{-2}$ which is among the highest RMs measured in quasar cores. We find hints of a correlation between the total intensity flux density and median polarization fraction. We find 59% of sources are variable in total intensity, and 100% in polarization at $3σ$ level, with no apparent correlation between total intensity variability and polarization variability. This indicates that it will be difficult to model these sources without simultaneous polarimetric monitoring observations and they will need to be masked for cosmological analysis.

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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