SIMBAD references

2015MNRAS.453.1223H - Mon. Not. R. Astron. Soc., 453, 1223-1240 (2015/October-3)

High radio-frequency properties and variability of brightest cluster galaxies.

HOGAN M.T., EDGE A.C., GEACH J.E., GRAINGE K.J.B., HLAVACEK-LARRONDO J., HOVATTA T., KARIM A., McNAMARA B.R., RUMSEY C., RUSSELL H.R., SALOME P., ALLER H.D., ALLER M.F., BENFORD D.J., FABIAN A.C., READHEAD A.C.S., SADLER E.M. and SAUNDERS R.D.E.

Abstract (from CDS):

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 percent of our parent sample ( ≥ 15.1 percent if only cool-core clusters are considered) contain a radio source at 150 GHz of at least 3 mJy (~1x1023 W/ Hz at our median redshift of z ~ 0.13). Furthermore, ≥ 3.4 percent 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 percent 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 percent 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 percent 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.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: active - galaxies: clusters: general - galaxies: jets - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/453/1223): table2.dat table3.dat table4.dat table5.dat>

Status at CDS:  

Simbad objects: 48

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2020.03.30-00:41:52

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