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High Radio Frequency Properties and Variability of Brightest Cluster Galaxies
- Source :
- Monthly notices of the Royal Astronomical Society, 2015, Vol.453(2), pp.1223-1240 [Peer Reviewed Journal], Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2015, 453 (2), pp.1223-1240. ⟨10.1093/mnras/stv1518⟩, Monthly Notices of the Royal Astronomical Society, 2015, 453 (2), pp.1223-1240. ⟨10.1093/mnras/stv1518⟩
- Publication Year :
- 2015
-
Abstract
- We consider the high radio frequency (15 GHz - 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% of our parent sample (>15.1% if only cool-core clusters are considered) contain a radio-source at 150 GHz of at least 3mJy (~1x10^23 W/Hz at our median redshift of z~0.13). Furthermore, >3.4% 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% 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% at 150 GHz over 6-month times-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% 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.<br />20 pages (+15 pages of Appendices), 16 figures (of which 6 in Appendices), 5 tables (of which 4 in Appendices). Accepted for publication in MNRAS
- Subjects :
- active [Galaxies]
Radio galaxy
Population
galaxies: active
FOS: Physical sciences
Astrophysics
clusters: general [Galaxies]
Peculiar galaxy
Galaxy group
Brightest cluster galaxy
education
galaxies. [Radio continuum]
ComputingMilieux_MISCELLANEOUS
Galaxy cluster
[PHYS]Physics [physics]
Physics
Luminous infrared galaxy
radio continuum: galaxies
education.field_of_study
ta115
ta213
Astronomy and Astrophysics
galaxies: jets
Astrophysics - Astrophysics of Galaxies
galaxies [radio continuum]
Space and Planetary Science
galaxies: clusters: general
Astrophysics of Galaxies (astro-ph.GA)
Elliptical galaxy
jets [Galaxies]
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Subjects
Details
- Language :
- English
- ISSN :
- 00358711 and 13652966
- Database :
- OpenAIRE
- Journal :
- Monthly notices of the Royal Astronomical Society, 2015, Vol.453(2), pp.1223-1240 [Peer Reviewed Journal], Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2015, 453 (2), pp.1223-1240. ⟨10.1093/mnras/stv1518⟩, Monthly Notices of the Royal Astronomical Society, 2015, 453 (2), pp.1223-1240. ⟨10.1093/mnras/stv1518⟩
- Accession number :
- edsair.doi.dedup.....8e5220e16db3d137fa844fd3f44956f6