Examinando por Autor "Bartalucci, I."

Mostrando 1 - 2 de 2

Acceso Abierto
Exploiting NIKA2/XMM-Newton imaging synergy for intermediate-mass high-z galaxy clusters within the NIKA2 SZ large program
(EDP Sciences, 2020-12-04) Kéruzoré, F.; Mayet, F.; Pratt, G. W.; Adam, R.; Ade, P.; André, P.; Andrianasolo, A.; Arnaud, M.; Aussel, H.; Bartalucci, I.; Beelen, A.; Benoit, A.; Berta, S.; Bourrion, O.; Calvo, M.; Catalano, A.; De Petris, M.; Désert, F. X.; Doyle, S.; Driessen, E. F. C.; Gómez, A.; Goupy, J.; Kramer, C.; Ladjelate, B.; Lagache, G.; Leclercq, S.; Lestrade, L. F.; Marcías Pérez, J. F.; Mauskopf, P.; Monfardini, A.; Perotto, L.; Pisano, G.; Pointecouteau, E.; Ponthieu, N.; Revéret, V.; Ritacco, A.; Roussel, H.; Ruppin, F.; Schuster, K.; Shu, S.; Sievers, A.; Tucker, C.; Romero Guzman, Catalina; Agence Nationale de la Recherche (ANR); European Commission (EC); National Aeronautics and Space Administration (NASA); Kéruzoré, F. h[0000-0002-9605-5588]; Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
High-resolution mapping of the intracluster medium (ICM) up to high redshift and down to low masses is crucial to derive accurate mass estimates of the galaxy cluster and to understand the systematic effects affecting cosmological studies based on galaxy clusters. We present a spatially resolved Sunyaev-Zel'dovich (SZ)/X-ray analysis of ACT-CL J0215.4+0030, a high-redshift (z=0.865) galaxy cluster of intermediate mass (M-500 similar or equal to 3.5x10(14) M-circle dot) observed as part of the ongoing NIKA2 SZ large program, which is a follow-up of a representative sample of objects at 0.5 <= z <= 0.9. In addition to the faintness and small angular size induced by its mass and redshift, the cluster is contaminated by point sources that significantly affect the SZ signal. This is therefore an interesting case study for the most challenging sources of the NIKA2 cluster sample. We present the NIKA2 observations of this cluster and the resulting data. We identified the point sources that affect the NIKA2 maps of the cluster as submillimeter galaxies with counterparts in catalogs of sources constructed by the SPIRE instrument on board the Herschel observatory. We reconstructed the ICM pressure profile by performing a joint analysis of the SZ signal and of the point-source component in the NIKA2 150 GHz map. This cluster is a very weak source that lies below the selection limit of the Planck catalog. Nonetheless, we obtained high-quality estimates of the ICM thermodynamical properties with NIKA2. We compared the pressure profile extracted from the NIKA2 map to the pressure profile obtained from X-ray data alone by deprojecting the public XMM-Newton observations of the cluster. We combined the NIKA2 pressure profile with the X-ray deprojected density to extract detailed information on the ICM. The radial distribution of its thermodynamic properties (the pressure, temperature and entropy) indicate that the cluster has a highly disturbed core. We also computed the hydrostatic mass of the cluster, which is compatible with estimations from SZ and X-ray scaling relations. We conclude that the NIKA2 SZ large program can deliver quality information on the thermodynamics of the ICM even for one of its faintest clusters after a careful treatment of the contamination by point sources.
Acceso Abierto
Unveiling the Merger Dynamics of the Most Massive MaDCoWS Cluster at z = 1.2 from a Multiwavelength Mapping of Its Intracluster Medium Properties
(The Institute of Physics (IOP), 2020-04-16) Ruppin, F.; McDonald, M.; Brodwin, M.; Adam, R.; Ade, P.; André, P.; Adrianasolo, A.; Arnaud, M.; Aussel, H.; Bartalucci, I.; Bautz, M. W.; Beelen, A.; Benoit, A.; Bideaud, A.; Bourrion, O.; Calvo, M.; Catalano, A.; Comis, B.; Decker, B.; De Petris, M.; Désert, F. X.; Doyle, S.; Driessen, E. F. C.; Eisenhardt, P. R. M.; Gómez, A.; González, A. H.; Goupy, J.; Kéruzoré, F.; Kramer, C.; Ladjelate, B.; Lagache, G.; Leclercq, S.; Lestrade, L. F.; Marcías Pérez, J. F.; Mauskopf, P.; Mayet, F.; Monfardini, A.; Moravec, E.; Perotto, L.; Pisano, G.; Pointecouteau, E.; Ponthieu, N.; Pratt, G. W.; Revéret, V.; Ritacco, A.; Roussel, H.; Schuster, K.; Shu, S.; Sievers, A.; Stanford, S. A.; Stern, D.; Tucker, C.; Zylka, R.; Romero Guzman, Catalina; Agence Nationale de la Recherche (ANR); European Commission (EC); National Aeronautics & Space Administration (NASA); Ministerio de Economía y Competitividad (MINECO); Brodwin, M. [0000-0002-4208-798X]; Ade, P. [0000-0002-5127-0401]; González, A. H. [0000-0002-0933-8601]; Moravec, E. [0000-0001-9793-5416]; Romero, C. [0000-0001-5725-0359]; Stern, D. [0000-0003-2686-9241]; Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
The characterization of the Intracluster Medium (ICM) properties of high-redshift galaxy clusters is fundamental to our understanding of large-scale structure formation processes. We present the results of a multiwavelength analysis of the very massive cluster MOO J1142+1527 at a redshift z = 1.2 discovered as part of the Massive and Distant Clusters of WISE Survey. This analysis is based on high angular resolution Chandra X-ray and NIKA2 Sunyaev–Zel'dovich (SZ) data. The cluster thermodynamic radial profiles have been obtained with unprecedented precision at this redshift and up to 0.7R500, thanks to the combination of high-resolution X-ray and SZ data. The comparison between the galaxy distribution mapped in infrared by Spitzer and the morphological properties of the ICM derived from the combined analysis of the Chandra and NIKA2 data leads us to the conclusion that the cluster is an ongoing merger. We have estimated a systematic uncertainty on the cluster total mass that characterizes both the impact of the observed deviations from spherical symmetry and of the core dynamics on the mass profile. We further combine the X-ray and SZ data at the pixel level to obtain maps of the temperature and entropy distributions. We find a relatively low-entropy core at the position of the X-ray peak and high-temperature regions located on its south and west sides. This work demonstrates that the addition of spatially resolved SZ observations to low signal-to-noise X-ray data brings a high information gain on the characterization of the evolution of ICM thermodynamic properties at z > 1.