High radio-frequency properties and variability of brightest cluster galaxies

被引：42

作者：

Hogan, M. T. ^{[1
,2
,3
]}

Edge, A. C. ^{[1
]}

Geach, J. E. ^{[4
]}

Grainge, K. J. B. ^{[5
]}

Hlavacek-Larrondo, J. ^{[6
,7
,8
]}

Hovatta, T. ^{[9
,10
]}

Karim, A. ^{[11
]}

McNamara, B. R. ^{[2
,3
]}

Rumsey, C. ^{[12
]}

Russell, H. R. ^{[13
]}

Salome, P. ^{[14
]}

Aller, H. D. ^{[15
]}

Aller, M. F.

Benford, D. J. ^{[16
]}

Fabian, A. C. ^{[13
]}

Readhead, A. C. S. ^{[9
]}

Sadler, E. M. ^{[17
]}

Saunders, R. D. E. ^{[12
]}

机构：

[1] Univ Durham, Dept Phys, Ctr Extragalact Astron, Durham DH1 3LE, England

[2] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[3] Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada

[4] Univ Hertfordshire, Ctr Astrophys Res, Sci & Technol Res Inst, Hatfield AL10 9AB, Herts, England

[5] Univ Manchester, Sch Phys & Astron, Ctr Astrophys, Jodrell Bank, Manchester M13 9PL, Lancs, England

[6] Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada

[7] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA USA

[8] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[9] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[10] Aalto Univ, Metsahovi Radio Observ, FI-02540 Kylmala, Finland

[11] Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany

[12] Cavendish Lab, Astrophys Grp, Cambridge CB3 0HE, England

[13] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[14] Observ Paris, LERMA, F-75014 Paris, France

[15] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[16] NASA, Goddard Space Flight Ctr, Observat Cosmol Lab, Greenbelt, MD 20771 USA

[17] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 453卷 / 02期

基金：

美国国家科学基金会; 加拿大创新基金会;

关键词：

galaxies: active; galaxies: clusters: general; galaxies: jets; radio continuum: galaxies; ACTIVE GALACTIC NUCLEI; ADVECTION-DOMINATED ACCRETION; HIGH-FREQUENCY PEAKERS; LONG-TERM VARIABILITY; ALL-SKY SURVEY; X-RAY; RADIO-SOURCES; AGN FEEDBACK; BLACK-HOLES; 3C; 84;

D O I：

10.1093/mnras/stv1518

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider the high radio-frequency (15-353 GHz) properties and variability of 35 brightest cluster galaxies (BCGs). These are the most core-dominated sources drawn from a parent sample of more than 700 X-ray selected clusters, thus allowing us to relate our results to the general population. We find that >= 6.0 per cent of our parent sample (>= 15.1 per cent if only cool-core clusters are considered) contain a radio source at 150 GHz of at least 3 mJy (approximate to 1x10(23) W Hz(-1) at our median redshift of z approximate to 0.13). Furthermore, >= 3.4 per cent of the BCGs in our parent sample contain a peaked component (Gigahertz Peaked Spectrum, GPS) in their spectra that peaks above 2 GHz, increasing to >= 8.5 per cent if only cool-core clusters are considered. We see little evidence for strong variability at 15 GHz on short (week-month) time-scales although we see variations greater than 20 per cent at 150 GHz over six-month time frames for 4 of the 23 sources with multi-epoch observations. Much more prevalent is long-term (year-decade time-scale) variability, with average annual amplitude variations greater than 1 per cent at 15 GHz being commonplace. There is a weak trend towards higher variability as the peak of the GPS-like component occurs at higher frequency. We demonstrate the complexity that is seen in the radio spectra of BCGs and discuss the potentially significant implications of these high-peaking components for Sunyaev-Zel 'dovich cluster searches.

引用

页码：1223 / 1240

页数：18

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