Sunyaev-Zel'dovich detection of the galaxy cluster Cl J1449+0856 at z=1.99 : The pressure profile in uv space

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Gobat , R , Daddi , E , Coogan , R T , Le Brun , A M C , Bournaud , F , Melin , J -B , Riechers , D A , Sargent , M , Valentino , F , Hwang , H S , Finoguenov , A & Strazzullo , V 2019 , ' Sunyaev-Zel'dovich detection of the galaxy cluster Cl J1449+0856 at z=1.99 : The pressure profile in uv space ' , Astronomy & Astrophysics , vol. 629 , A104 . https://doi.org/10.1051/0004-6361/201935862

Title: Sunyaev-Zel'dovich detection of the galaxy cluster Cl J1449+0856 at z=1.99 : The pressure profile in uv space
Author: Gobat, R.; Daddi, E.; Coogan, R. T.; Le Brun, A. M. C.; Bournaud, F.; Melin, J. -B.; Riechers, D. A.; Sargent, M.; Valentino, F.; Hwang, H. S.; Finoguenov, A.; Strazzullo, V.
Contributor: University of Helsinki, Department of Physics
Date: 2019-09-12
Language: eng
Number of pages: 10
Belongs to series: Astronomy & Astrophysics
ISSN: 1432-0746
URI: http://hdl.handle.net/10138/308393
Abstract: We 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 sigma significance. The total signal is -190 +/- 36 mu Jy, with a peak offset by 5 ''-9 '' (similar to 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 similar to 6 x 10(13) M-circle dot 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 that 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.
Subject: galaxies: clusters: intracluster medium
galaxies: clusters: individual: Cl J1449+0856
HOT GAS
STAR-FORMATION
EVOLUTION
EMISSION
ENTROPY
115 Astronomy, Space science
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