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J/A+A/614/A118      NIKA Sunyaev-Zel'dovich data release           (Adam+, 2018)

Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters. Adam R., Hahn O., Ruppin F., Ade P., Andre P., Arnaud M., Bartalucci I., Beelen A., Benoit A., Bideaud A., Billot N., Bourrion O., Calvo M., Catalano A., Coiffard G., Comis B., D'Addabbo A., Desert F.-X., Doyle S., Ferrari C., Goupy J., Kramer C., Lagache G., Leclercq S., Lestrade J.-F., Macias-Perez J.F., Martinez Aviles G., Martizzi D., Maurogordato S., Mauskopf P., Mayet F., Monfardini A., Pajot F., Pascale E., Perotto L., Pisano G., Pointecouteau E., Ponthieu N., Pratt G.W., Reveret V., Ricci M., Ritacco A., Rodriguez L., Romero C., Roussel H., Schuster K., Sievers A., Triqueneaux S., Tucker C., Wu H.-Y., Zylka R. <Astron. Astrophys. 614, A118 (2018)> =2018A&A...614A.118A (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Radio continuum Keywords: techniques: high angular resolution - techniques: image processing - galaxies: clusters: intracluster medium - large-scale structure of Universe Abstract: Substructures in the hot gas atmosphere of galaxy clusters are related to their formation history and to the astrophysical processes at play in the intracluster medium (ICM). The thermal Sunyaev-Zel'dovich (tSZ) effect is directly sensitive to the line-of-sight integrated ICM pressure, and is thus particularly adapted to study ICM substructures. In this paper, we apply structure-enhancement filtering algorithms to high-resolution tSZ observations (e.g., NIKA) of distant clusters in order to search for pressure discontinuities, compressions, and secondary peaks in the ICM. The same filters are applied to toy-model images and to synthetic tSZ images extracted from RHAPSODY-G cosmological hydrodynamic simulations, in order to better interpret the extracted features. We also study the noise propagation through the filters and quantify the impact of systematic effects, such as data-processing-induced artifacts and point-source residuals, the latter being identified as the dominant potential contaminant. In three of our six NIKA-observed clusters we identify features at high signal-to-noise ratio that show clear evidence for merger events. In MACS J0717.5+3745 (z=0.55), three strong pressure gradients are observed on the east, southeast, and west sectors, and two main peaks in the pressure distribution are identified. We observe a lack of tSZ compact structure in the cool-core cluster PSZ1 G045.85+57.71 (z=0.61), and a tSZ gradient ridge dominates in the southeast. In the highest redshift cluster, CL J1226.9+3332 (z=0.89), we detect a ridge pressure gradient of ∼45-arcsec (360kpc) in length associated with a secondary pressure peak in the west region. Our results show that current tSZ facilities have now reached the angular resolution and sensitivity to allow an exploration of the details of pressure substructures in clusters, even at high redshift. This opens the possibility to quantify the impact of the dynamical state on the relation between the tSZ signal and the mass of clusters, which is important when using tSZ clusters to test cosmological models. This work also marks the first NIKA cluster sample data release. Description: The surface brightness maps of the 6 clusters obtained with NIKA at the IRAM 30-meter telescope at 150 GHz are presented together with the necessary data products to use them. They were obtained between November 2012 and February 2015. In the case of the cluster RX J1347.5-1145, the map can only be used qualitatively and the extra data products do not apply. The 150GHz bandpass is provided. The maps FWHM angular resolution is 18.2" and we provide the beam profile. Due to the scanning strategy, the noise rms is relatively constant in the central 80" radius but rapidly increase towards the edge. Noise Monte Carlo realization are provided to address the noise properties. Scales larger than 2' are filtered during the data reduction and the corresponding transfer functions are is provided. The clusters fields are contaminated by point sources and we provide best-fit point source models. The cluster MACS J0717.5+3745 is affected by kinetic SZ signal and we provide a best-fit model to correct for it. The image coordinates can be found in the FITS header. Units are mJy/beam. More information can be obtained via http://lpsc.in2p3.fr/NIKA2LPSZ/nika2sz.release.php. Objects: ------------------------------------------------------------------------ RA (ICRS) DE Designation(s) ------------------------------------------------------------------------ 12 26 57.7 +33 32 50 CL J1226.9+3332 = ClG J1226+3332 07 17 36.50 +37 45 23.0 MACS J0717.5+3745 = ClG J0717+3745 14 23 47.7 +24 04 40 MACS J1423.8+2404 = ClG J1423+2404 15 18 19.2 +29 27 24 PSZ1 G045.85+57.71 = PSZ1 G045.85+57.71 17 17 00.3 +24 04 25 PSZ1 G046.13+30.75 = PSZ1 G046.13+30.75 13 47 33.5 -11 45 42 RX J1347.5-1145 = ClG J1347-1145 ------------------------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 174 18 List of fits images fits/* 0 18 Individual fits images beam.dat 32 101 150GHz beam (Beam150GHz.fits) bandpass.dat 18 170 150GHz bandpass (BandPass150GHz.fits) ftclj.dat 24 76 *Transfer function of CLJ1226.9+3332 at 150GHz (TransferFunction150GHz_CLJ1227.fits) ftmacs07.dat 24 76 *Transfer function of MACSJ0717.5+3745 at 150GHz (TransferFunction150GHz_MACSJ0717.fits) ftmacs14.dat 24 76 *Transfer function of MACS J1423.8+2404 at 150GHz (TransferFunction150GHz_MACSJ1424.fits) ftpsz045.dat 24 76 *Transfer function of PSZ1 G045.85+57.71 at 150GHz (TransferFunction150GHz_PSZ1G045.fits) ftpsz046.dat 24 76 *Transfer function of PSZ1 G046.13+30.75 at 150GHz TransferFunction150GHz_PSZ1G046.fits) files/* 0 7 Beam, bandpass and transfer functions files in fits format
Note on ft*: RESOINIARCSEC=2.0000016 and NSIDE_INI=151.
See also: J/A+A/576/A12 : NIKA maps of ClG J1226.9+3332 at 150 and 250GHz (Adam+, 2015) http://lpsc.in2p3.fr/NIKA2LPSZ/nika2sz.release.php : Explanatory supplement Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000) 10- 18 F9.5 deg DEdeg Declination of center (J2000) 20- 22 I3 --- Nx Number of pixels along X-axis 24- 26 I3 --- Ny Number of pixels along Y-axis 28- 30 I3 Kibyte size Size of FITS file 32- 68 A37 --- FileName Name of FITS file, in subdirectory fits 70-174 A105 --- Title Title of the FITS file
Byte-by-byte Description of file: beam.dat
Bytes Format Units Label Explanations
1- 9 F9.5 arcsec Radius ?=- Radius (RADIUS_ARCSEC) 11- 21 F11.8 --- Beam ?=- Beam (BEAM) 23- 32 F10.8 --- e_Beam ?=- Beam error (BEAM_ERROR)
Byte-by-byte Description of file: bandpass.dat
Bytes Format Units Label Explanations
1- 9 F9.5 GHz Freq Frequency (FREQ_GHZ) 11- 18 F8.6 --- Trans ?=0 Transmission (TRANSMISSION)
Byte-by-byte Description of file: ft*.dat
Bytes Format Units Label Explanations
1- 8 F8.6 arcsec Wave Wave number (WAVENUMBERARCSEC) 10- 16 F7.5 --- TF Transfer function (TF) 18- 24 F7.5 --- e_TF Error on TF (TF_ERR)
Acknowledgements: Remi Adam, remi.adam(at)oca.eu References: Explanatory supplement at http://lpsc.in2p3.fr/NIKA2LPSZ/nika2sz.release.php R. Adam, O. Hahn, F. Ruppin et al. (2017), submitted to A&A Sub-structure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters C. Romero, M. McWilliam, J. F. Macedas-Perez et al. (2017), A&A, in-press, arXiv:1707.06113 A multi-instrument non-parametric reconstruction of the electron pressure profile in the galaxy cluster CLJ1226.9+3332 R. Adam, M. Arnaud, I. Bartalucci et al. (2017A&A...606A..64A), arXiv:1706.10230 Mapping the hot gas temperature in galaxy clusters using X-ray and Sunyaev-Zel'dovich imaging F. Ruppin, R. Adam, B. Comis et al. (2017A&A...597A.110R), arXiv:1607.07679 Non parametric deprojection of NIKA SZ observations: pressure distribution in the Planck-discovered cluster PSZ1 G045.85+57.71 R. Adam, I. Bartalucci, G. W. Pratt et al. (2017A&A...598A.115A), arXiv:1606.07721 Mapping the kinetic Sunyaev-Zel'dovich effect toward MACS J0717.5+3745 with NIKA R. Adam, B. Comis, I. Bartalucci et al. (2016A&A...586A.122A), arXiv:1510.06674 High angular resolution Sunyaev-Zel'dovich observations of MACS J1423.8+2404 with NIKA: multi-wavelength analysis R. Adam (2015), Ph.D. thesis, https://tel.archives-ouvertes.fr/tel-01303736 Observation des amas de galaxies par effet Sunyaev-Zel'dovich et de la polarisation du fond diffus cosmologique : de Planck a NIKA R. Adam, B. Comis, J. F. Macedas-Perez et al. (2015A&A...576A..12A, Cat. J/A+A/576/A12), arXiv:1410.2808 Pressure distribution of the high-redshift cluster of galaxies CL J1226.9+3332 with NIKA A. Catalano, M. Calvo, N. Ponthieu, R. Adam et al. (2014A&A...569A...9C), arXiv:1402.0260 Performance and calibration of the NIKA camera at the IRAM 30m telescope R. Adam, B. Comis, J. F. Macedas-Perez et al. (2014A&A...569A..66A), arXiv:1310.6237 First observation of the thermal Sunyaev-Zel'dovich effect with kinetic inductance detectors
(End) Patricia Vannier [CDS] 28-Dec-2017
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