TY - JOUR
T1 - High angular resolution Sunyaev-Zel'dovich observations of MACS J1423.8+2404 with NIKA
T2 - Multiwavelength analysis
AU - Adam, R.
AU - Comis, B.
AU - Bartalucci, I.
AU - Adane, A.
AU - Ade, P.
AU - André, P.
AU - Arnaud, M.
AU - Beelen, A.
AU - Belier, B.
AU - Benoît, A.
AU - Bideaud, A.
AU - Billot, N.
AU - Bourrion, O.
AU - Calvo, M.
AU - Catalano, A.
AU - Coiffard, G.
AU - D'Addabbo, A.
AU - Désert, F. X.
AU - Doyle, S.
AU - Goupy, J.
AU - Hasnoun, B.
AU - Hermelo, I.
AU - Kramer, C.
AU - Lagache, G.
AU - Leclercq, S.
AU - MacÍas-Pérez, J. F.
AU - Martino, J.
AU - Mauskopf, Philip
AU - Mayet, F.
AU - Monfardini, A.
AU - Pajot, F.
AU - Pascale, E.
AU - Perotto, L.
AU - Pointecouteau, E.
AU - Ponthieu, N.
AU - Pratt, G. W.
AU - Revéret, V.
AU - Ritacco, A.
AU - Rodriguez, L.
AU - Savini, G.
AU - Schuster, K.
AU - Sievers, A.
AU - Triqueneaux, S.
AU - Tucker, C.
AU - Zylka, R.
N1 - Funding Information:
We are thankful to the anonymous referee for useful comments that helped improve the quality of the paper. We thank Marco De Petris for useful comments. We would like to thank the IRAM staff for their support during the NIKA campaign. We thank Karin Dassas for helping us obtain the Herschel data. This work has been partially funded by the Foundation Nanoscience Grenoble, the ANR under the contracts “MKIDS” and “NIKA”. This work has been partially supported by the LabEx FOCUS ANR-11-LABX-0013. This work has benefited from the support of the European Research Council Advanced Grant ORISTARS under the European Union’s Seventh Framework Program (Grant Agreement No. 291294). This work has benefited from the support of the European Research Council Advanced Grant M2C under the European Union’s Seventh Framework Programme (Grant Agreement No. 340519). The NIKA dilution cryostat was designed and built at the Institut Néel. In particular, we acknowledge the crucial contribution of the Cryogenics Group and, in particular Gregory Garde, Henri Rodenas, Jean-Paul Leggeri, and Philippe Camus. We acknowledge the use of the IGLO-HESIOD service from the Integrated Data & Operation Center (IDOC). Support for IDOC is provided by CNRS & CNES. R.A. would like to thank the ENIGMASS French LabEx for funding this work. B.C. acknowledges support from the CNES postdoctoral fellowship program. A.R. acknowledges support from the CNES doctoral fellowship program. E.P. acknowledges the support of the French Agence Nationale de la Recherche under grant ANR-11-BD56-015.
Publisher Copyright:
© 2016 ESO.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - The prototype of the NIKA2 camera, NIKA, is a dual-band instrument operating at the IRAM 30-m telescope, which can observe the sky simultaneously at 150 and 260 GHz. One of the main goals of NIKA (and NIKA2) is to measure the pressure distribution in galaxy clusters at high angular resolution using the thermal Sunyaev-Zel'dovich (tSZ) effect. Such observations have already proved to be an excellent probe of cluster pressure distributions even at intermediate and high redshifts. However, an important fraction of clusters host sub-millimeter and/or radio point sources, which can significantly affect the reconstructed signal. Here we report on <20 arcsec angular resolution observations at 150 and 260 GHz of the cluster MACS J1423.8+2404, which hosts both radio and sub-millimeter point sources. We examine the morphological distribution of the tSZ signal and compare it to other datasets. The NIKA data are combined with Herschel satellite data to study the spectral energy distribution (SED) of the sub-millimeter point source contaminants. We then perform a joint reconstruction of the intracluster medium (ICM) electronic pressure and density by combining NIKA, Planck, XMM-Newton, and Chandra data, focusing on the impact of the radio and sub-millimeter sources on the reconstructed pressureprofile. We find that large-scale pressure distribution is unaffected by the point sources because of the resolved nature of the NIKA observations. The reconstructed pressure in the inner region is slightly higher when the contribution of point sources are removed. We show that it is not possible to set strong constraints on the central pressure distribution without accurately removing these contaminants. The comparison with X-ray only data shows good agreement for the pressure, temperature, and entropy profiles, which all indicate that MACS J1423.8+2404 is a dynamically relaxed cool core system. The present observations illustrate the possibility of measuring these quantities with a relatively small integration time, even at high redshift and without X-ray spectroscopy. This work is part of a pilot study aiming at optimizing tSZ observations with the future NIKA2 camera.
AB - The prototype of the NIKA2 camera, NIKA, is a dual-band instrument operating at the IRAM 30-m telescope, which can observe the sky simultaneously at 150 and 260 GHz. One of the main goals of NIKA (and NIKA2) is to measure the pressure distribution in galaxy clusters at high angular resolution using the thermal Sunyaev-Zel'dovich (tSZ) effect. Such observations have already proved to be an excellent probe of cluster pressure distributions even at intermediate and high redshifts. However, an important fraction of clusters host sub-millimeter and/or radio point sources, which can significantly affect the reconstructed signal. Here we report on <20 arcsec angular resolution observations at 150 and 260 GHz of the cluster MACS J1423.8+2404, which hosts both radio and sub-millimeter point sources. We examine the morphological distribution of the tSZ signal and compare it to other datasets. The NIKA data are combined with Herschel satellite data to study the spectral energy distribution (SED) of the sub-millimeter point source contaminants. We then perform a joint reconstruction of the intracluster medium (ICM) electronic pressure and density by combining NIKA, Planck, XMM-Newton, and Chandra data, focusing on the impact of the radio and sub-millimeter sources on the reconstructed pressureprofile. We find that large-scale pressure distribution is unaffected by the point sources because of the resolved nature of the NIKA observations. The reconstructed pressure in the inner region is slightly higher when the contribution of point sources are removed. We show that it is not possible to set strong constraints on the central pressure distribution without accurately removing these contaminants. The comparison with X-ray only data shows good agreement for the pressure, temperature, and entropy profiles, which all indicate that MACS J1423.8+2404 is a dynamically relaxed cool core system. The present observations illustrate the possibility of measuring these quantities with a relatively small integration time, even at high redshift and without X-ray spectroscopy. This work is part of a pilot study aiming at optimizing tSZ observations with the future NIKA2 camera.
KW - Galaxies: clusters: individual: MACS J1423.8+2404
KW - Galaxies: clusters: intracluster medium
KW - Techniques: high angular resolution
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UR - http://www.scopus.com/inward/citedby.url?scp=84957576769&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201527616
DO - 10.1051/0004-6361/201527616
M3 - Article
AN - SCOPUS:84957576769
SN - 0004-6361
VL - 586
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A122
ER -