SIMBAD references

2002MNRAS.331....1C - Mon. Not. R. Astron. Soc., 331, 1-6 (2002/March-3)

Detection of a cosmic microwave background decrement towards a cluster of mJy radio sources.

COTTER G., BUTTERY H.J., RAWLINGS S., CROFT S., HILL G.J., GAY P., DAS R., DRORY N., GRAINGE K., GRAINGER W.F., JONES M.E., POOLEY G.G. and SAUNDERS R.

Abstract (from CDS):

We present the results of radio, optical and near-infrared observations of the field of TOC J0233.3+3021, a cluster of milliJansky radio sources from the TexOx Cluster survey. In an observation of this field with the Ryle Telescope (RT) at 15GHz, we measure a decrement in the cosmic microwave background (CMB) of -675±95µJy on the RT's~0.65kλ baseline. Using optical and infrared imaging with the McDonald 2.7-m Smith Reflector, the Calar Alto 3.5-m telescope and the United Kingdom Infrared Telescope (UKIRT), we identify the host galaxies of five of the radio sources and measure magnitudes of R ~24, J ~20, K ~18.

The cosmic microwave background (CMB) decrement is consistent with the Sunyaev-Zel'dovich (SZ) effect of a massive cluster of galaxies, which if modelled as a spherical King profile of core radius θC=20arcsec has a central temperature decrement of 900µK. The magnitudes and colours of the galaxies are consistent with those of old ellipticals at z ∼1. We therefore conclude that TOC J0233.3+3021 is a massive, high redshift cluster. These observations add to the growing evidence for a significant population of massive clusters at high redshift, and demonstrate the effectiveness of combining searches for active galactic nuclei (AGN) `signposts' to clusters with the redshift-independence of the SZ effect.


Abstract Copyright: 2002 Blackwell Science Ltd

Journal keyword(s): galaxies: active - galaxies: clusters: general - cosmic microwave background - cosmology: observations

Nomenclature: Fig.2: [CBR2002] A (Nos A-E). [CBR2002] JHHMMSS.ss+DDMMSS.ss N=8.

CDS comments: TOC J0233.3+3021 = ClG J0233+3021

Simbad objects: 12

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