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The XXL Survey: XLIV. Sunyaev-Zel’dovich mapping of a low-mass cluster at z ∼ 1: a multi-wavelength approach

M. Ricci 1, 2, * R. Adam 3 D. Eckert P. Ade P. André A. Andrianasolo 4 B. Altieri 5 H. Aussel 6 A. Beelen 7 C. Benoist 8 A. Benoît 9 S. Berta 10 A. Bideaud 11 M. Birkinshaw 12 O. Bourrion 13 D. Boutigny 2 M. Bremer 12 M. Calvo 9 A. Cappi 14 L. Chiappetti A. Catalano 13 M. de Petris F.-X. Désert 4 S. Doyle E. F. C. Driessen 10 L. Faccioli 6 C. Ferrari S. Fotopoulou 15, 16 F. Gastaldello P. Giles A. Gomez 17 J. Goupy O. Hahn 1 C. Horellou F. Kéruzoré 13 E. Koulouridis 6 C. Kramer 18, 10 B. Ladjelate 6 G. Lagache 19 S. Leclercq 10 J.-F. Lestrade 20 J. F. Macías-Pérez 13 B. Maughan 21 S. Maurogordato 8 P. Mauskopf A. Monfardini 9 F. Pacaud L. Perotto 13 M. Pierre 6 G. Pisano 22 E. Pompei 23 N. Ponthieu 24 V. Revéret 6 A. Ritacco 25 C. Romero H. Roussel 26 F. Ruppin 13 M. Sánchez Portal 27 K. Schuster 10 M. Sereno S. Shu 10 A. Sievers 18 C. Tucker K. Umetsu
Abstract : High-mass clusters at low redshifts have been intensively studied at various wavelengths. However, while more distant objects at lower masses constitute the bulk population of future surveys, their physical state remain poorly explored to date. In this paper, we present resolved observations of the Sunyaev-Zel’dovich (SZ) effect, obtained with the NIKA2 camera, towards the cluster of galaxies XLSSC 102, a relatively low-mass system (M500 ∼ 2 × 1014 M⊙) at z = 0.97 detected from the XXL survey. We combine NIKA2 SZ data, XMM-Newton X-ray data, and Megacam optical data to explore, respectively, the spatial distribution of the gas electron pressure, the gas density, and the galaxies themselves. We find significant offsets between the X-ray peak, the SZ peak, the brightest cluster galaxy, and the peak of galaxy density. Additionally, the galaxy distribution and the gas present elongated morphologies. This is interpreted as the sign of a recent major merging event, which induced a local boost of the gas pressure towards the north of XLSSC 102 and stripped the gas out of the galaxy group. The NIKA2 data are also combined with XXL data to construct the thermodynamic profiles of XLSSC 102, obtaining relatively tight constraints up to about ∼r500, and revealing properties that are typical of disturbed systems. We also explore the impact of the cluster centre definition and the implication of local pressure substructure on the recovered profiles. Finally, we derive the global properties of XLSSC 102 and compare them to those of high-mass-and-low-redshift systems, finding no strong evidence for non-standard evolution. We also use scaling relations to obtain alternative mass estimates from our profiles. The variation between these different mass estimates reflects the difficulty to accurately measure the mass of low-mass clusters at z ∼ 1, especially with low signal-to-noise ratio data and for a disturbed system. However, it also highlights the strength of resolved SZ observations alone and in combination with survey-like X-ray data. This is promising for the study of high redshift clusters from the combination of eROSITA and high resolution SZ instruments and will complement the new generation of optical surveys from facilities such as LSST and Euclid.
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Submitted on : Wednesday, October 14, 2020 - 2:22:50 AM
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M. Ricci, R. Adam, D. Eckert, P. Ade, P. André, et al.. The XXL Survey: XLIV. Sunyaev-Zel’dovich mapping of a low-mass cluster at z ∼ 1: a multi-wavelength approach. Astronomy and Astrophysics - A&A, EDP Sciences, 2020, 642, pp.A126. ⟨10.1051/0004-6361/201937249⟩. ⟨hal-02966422⟩



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