Further Sunyaev-Zel'dovich observations of two Planck ERCSC clusters with the Arcminute Microkelvin Imager

TL;DR

This paper reports follow-up Sunyaev-Zel'dovich observations of two galaxy clusters from the Planck catalog using the Arcminute Microkelvin Imager, confirming one cluster and refining its position.

Contribution

It provides new SZ measurements and improved positional data for two Planck-detected galaxy clusters, demonstrating the effectiveness of the AMI instrument for such follow-up.

Findings

Confirmed SZ decrement for PLCKESZ G121.11+57.01 with precise position.

Failed to confirm the SZ signal for PLCKESZ G115.71+17.52 due to extended emission.

Refined the cluster position to within 20 arcseconds for G121.11+57.01.

Abstract

We present follow-up observations of two galaxy clusters detected blindly via the Sunyaev-Zel'dovich (SZ) effect and released in the Planck Early Release Compact Source Catalogue. We use the Arcminute Microkelvin Imager, a dual-array 14-18 GHz radio interferometer. After radio source subtraction, we find a SZ decrement of integrated flux density -1.08+/-0.10 mJy toward PLCKESZ G121.11+57.01, and improve the position measurement of the cluster, finding the centre to be RA 12 59 36.4, Dec +60 04 46.8, to an accuracy of 20 arcseconds. The region of PLCKESZ G115.71+17.52 contains strong extended emission, so we are unable to confirm the presence of this cluster via the SZ effect.