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Sunyaev-Zel'dovich detection of the galaxy cluster Cl J1449+0856 at z = 1.99: the pressure profile in uv space
Version 2 2023-06-07, 08:29
Version 1 2023-06-07, 06:44
journal contribution
posted on 2023-06-07, 08:29 authored by R Gobat, E Daddi, Rosemary Coogan, A M C Le Brun, F Bournaud, J -B Melin, D A Riechers, Mark Sargent, F Valentino, H S Hwang, A Finoguenov, V StrazzulloWe present Atacama Large Millimetre Array and Atacama Compact Array observations of the Sunyaev-Zel'dovich effect in the z = 2 galaxy cluster Cl J1449+0856, an X-ray-detected progenitor of typical massive clusters in the present day Universe. While in a cleaned but otherwise untouched 92 GHz map of this cluster, little to no negative signal is visible, careful subtraction of known sub-millimetre emitters in the uv plane reveals a decrement at 5 s significance. The total signal is -190 ± 36 µ Jy, with a peak offset by 5"-9" ( ~ 50 kpc) from both the X-ray centroid and the still-forming brightest cluster galaxy. A comparison of the recovered uv-amplitude profile of the decrement with different pressure models allows us to derive total mass constraints consistent with the ~ 6 × 10 13 M ? estimated from X-ray data. Moreover, we find no strong evidence for a deviation of the pressure profile with respect to local galaxy clusters, although a slight tension at small-to-intermediate spatial scales suggests a flattened central profile, opposite to what seen in a cool core and possibly an AGN-related effect. This analysis of the lowest mass single SZ detection so far illustrates the importance of interferometers when observing the SZ effect in high-redshift clusters, the cores of which cannot be considered quiescent, such that careful subtraction of galaxy emission is necessary.
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- Published
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- Published version
Journal
Astronomy and AstrophysicsISSN
0004-6361Publisher
EDP SciencesExternal DOI
Issue
A104Volume
629Page range
1-10Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
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- No
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- Yes
Legacy Posted Date
2019-09-10First Open Access (FOA) Date
2019-09-10First Compliant Deposit (FCD) Date
2019-09-06Usage metrics
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