Radio-quiet quasars in the VIDEO survey: evidence for AGN-powered radio emission at S1.4 GHz < 1 mJy

被引：56
作者：
White, Sarah V. [1 ]
Jarvis, Matt J. [1 ,2 ]
Haeussler, Boris [1 ,3 ]
Maddox, Natasha [4 ,5 ]
机构：
[1] Univ Oxford, Astrophys, Oxford OX1 3RH, England
[2] Univ Western Cape, Dept Phys, ZA-7535 Bellville, South Africa
[3] Univ Hertfordshire, Ctr Astrophys, Sci & Technol Res Inst, Hatfield AL10 9AB, Herts, England
[4] Netherlands Inst Radio Astron ASTRON, NL-7990 AA Dwingeloo, Netherlands
[5] Univ Cape Town, ACGC, ZA-7701 Rondebosch, South Africa
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 448卷 / 03期
基金：
英国科学技术设施理事会;
关键词：
galaxies: active; galaxies: evolution; galaxies: high-redshift; quasars: general; galaxies: star formation; radio continuum: galaxies; ACTIVE GALACTIC NUCLEI; BLACK-HOLE MASS; SPECTRAL ENERGY-DISTRIBUTIONS; DIGITAL SKY SURVEY; OPTICALLY SELECTED QUASARS; INFRARED EXTRAGALACTIC SURVEY; STAR-FORMATION HISTORY; HIGH-REDSHIFT GALAXIES; PHOENIX DEEP SURVEY; LUMINOSITY FUNCTION;
D O I：
10.1093/mnras/stv134
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Understanding the interplay between black-hole accretion and star formation, and how to disentangle the two, is crucial to our understanding of galaxy formation and evolution. To investigate, we use a combination of optical and near-infrared photometry to select a sample of 74 quasars from the VISTA Deep Extragalactic Observations (VIDEO) survey, over 1 deg(2). The depth of VIDEO allows us to study very low accretion rates and/or lower-mass black holes, and 26 per cent of the candidate quasar sample has been spectroscopically confirmed. We use a radio-stacking technique to sample below the nominal flux-density threshold using data from the Very Large Array at 1.4 GHz and find, in agreement with other work, that a power-law fit to the quasar-related radio source counts is inadequate at low flux density. By comparing with a control sample of galaxies (where we match in terms of stellar mass), and by estimating the star formation rate, we suggest that this radio emission is predominantly caused by accretion activity rather than star-formation activity.
引用
收藏
页码：2665 / 2686
页数：22
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