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Detection of a CMB decrement towards a cluster of mJy radiosources | | Garret Cotter
; Helen J. Buttery
; Steve Rawlings
; Steve Croft
; Gary J. Hill
; Pamela Gay
; Rhiju Das
; Niv Drory
; Keith Grainge
; William F. Grainger
; Michael E. Jones
; G. G. Pooley
; Richard Saunders
; | | Date: |
27 Sep 2001 | | Journal: | Mon.Not.Roy.Astron.Soc. 331 (2002) 1 | | Subject: | astro-ph | | Abstract: | We present the results of radio, optical and near-infrared observations of the field of TOC J0233.3+3021, a cluster of milliJansky radiosources from the TexOx Cluster survey. In an observation of this field with the Ryle Telescope (RT) at 15 GHz, we measure a decrement in the cosmic microwave background (CMB) of $-675 pm 95 mu$Jy on the RT’s $approx$ 0.65 k$lambda$ baseline. Using optical and infrared imaging with the McDonald 2.7-m Smith Reflector, Calar Alto 3.5-m telescope and UKIRT, we identify the host galaxies of five of the radiosources and measure magnitudes of $R approx 24$, $J approx 20$, $K approx 18$. The 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 $ heta_C = 20^{primeprime}$ has a central temperature decrement of $900 mu$K. The magnitudes and colours of the galaxies are consistent with those of old ellipticals at $z sim 1$. 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 AGN `signposts’ to clusters with the redshift-independence of the SZ effect. | | Source: | arXiv, astro-ph/0109506 | | Services: | Forum | Review | PDF | Favorites | |
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