FIRST无线电测量：在牧夫座和鲸鱼座地区识别的FIRST无线电源的K-z图
The FIRST radio survey: The K-z diagram of FIRST radio sources identified in the Boötes and Cetus fields
摘要：
本文给出了在牧夫座和鲸鱼座观测场中发现的FIRST（20厘米射电天空的微弱图像）射电源的哈勃图（K-z关系）。FIRST-NDWFS样品的K星等与光度红移之间的相关性被发现是线性的。关于最佳拟合线的离差对于整个样品由1.53给出，并且在z>1时由0.75给出。本文还给出了FIRST射电源和通量密度极限逐渐变弱的低频选定射电样品（3CRR、6C、7 CRS和EIS-NVSS样品）的合成K-z图。大多数FIRST射电源比没有演化曲线的星系（3L* 星系）更暗，这可能突出了星系光度与射电源相关的事实。
英文摘要：
This paper presents the Hubble diagram (K-z relation) for FIRST (Faint Images of the Radio Sky at 20 cm) radio sources identified in the Bootes and Cetus fields. The correlation between the K magnitude of the FIRST-NDWFS sample and the photometric redshifts found to be linear. The dispersion about the best fit line is given by 1.53 for the whole sample and 0.75 at z>1. The paper also presents a composite K-z diagram of FIRST radio sources and low-frequency selected radio samples with progressively fainter flux-density limits (3CRR, 6C, 7CRS and the EIS-NVSS sample). The majority of FIRST radio sources lie fainter than the no evolution curve (3L* galaxies) probably highlighting the fact that the galaxy luminosity is correlated with the radio power.
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