J/A+A/576/A12 NIKA maps of ClG J1226.9+3332 at 150 and 250GHz (Adam+, 2015)
Pressure distribution of the high-redshift cluster of galaxies
CL J1226.9+3332 with NIKA.
Adam R.A., Comis B.C., Macedas-Perez J.F., Adane A., Ade P., Andre P.,
Beelen A., Belier B., Benoit A., Bideaud A., Billot N., Blanquer G.,
Bourrion O., Calvo M., Catalano A., Coiffard G., Cruciani A., D'Addabbo A.,
Desert F.-X., Doyle S., Goupy J., Kramer C., Leclercq S., Martino J.,
Mauskopf P., Mayet F., Monfardini A., Pajot F., Pascale E., Perotto L.,
Pointecouteau E., Ponthieu N., Reveret V., Ritacco A., Rodriguez L.,
Savini G., Schuster K., Sievers A., Tucker C., Zylka R.
<Astron. Astrophys. 576, A12 (2015)>
=2015A&A...576A..12A 2015A&A...576A..12A
ADC_Keywords: Clusters, galaxy ; Radio continuum
Keywords: techniques: high angular resolution -
galaxies: clusters: individual: CL J1226.9+3332
Abstract:
The thermal Sunyaev-Zel'Dovich (tSZ) effect is expected to provide a
low scatter mass proxy for galaxy clusters since it is directly
proportional to the cluster thermal energy. The tSZ observations have
proven to be a powerful tool for detecting and studying them, but high
angular resolution observations are now needed to push their
investigation to a higher redshift. In this paper, we report high
angular (<20-arcsec) resolution tSZ observations of the high-redshift
cluster CL J1226.9+3332 (z=0.89). It was imaged at 150 and 260GHz
using the NIKA camera at the IRAM 30-meter telescope. The 150GHz map
shows that CL J1226.9+3332 is morphologically relaxed on large scales
with evidence of a disturbed core, while the 260GHz channel is used
mostly to identify point source contamination. NIKA data are combined
with those of Planck and X-ray from Chandra to infer the cluster's
radial pressure, density, temperature, and entropy distributions. The
total mass profile of the cluster is derived, and we find
M500=5.96+1.02-0.79x1014M_☉ within the radius
R500=930+50_-43kpc, at a 68% confidence level. (R500 is the
radius within which the average density is 500 times the critical
density at the cluster's redshift.) NIKA is the prototype camera of
NIKA2, a KIDs (kinetic inductance detectors) based instrument to be
installed at the end of 2015. This work is, therefore, part of a pilot
study aiming at optimizing tSZ NIKA2 large programs.
Description:
The surface brightness maps of CL J1226.9+3332 obtained with NIKA at
the IRAM 30-meter telescope at 150 and 260GHz are presented. They
were obtained during the first NIKA open pool in February 2014. The
maps FWHM angular resolution is 12.0" at 250GHz and 18.2" at 150GHz.
Due to the scanning strategy, the noise rms is relatively constant in
the central 80" radius but rapidly increase towards the edge, being up
to four times larger in the corners. Scales larger than 2' are
filtered during the data reduction. The image coordinates can be found
in the FITS header. Units are mJy/beam.
Objects:
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RA (2000) DE Designation(s)
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12 26 57.7 +33 32 50 ClG J1226.9+3332 = RX J1226.9+3332
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 112 2 List of FITS images
fits/* . 2 Individual FITS images (5'x5')
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20 I1 arcsec/pix Scale [2] Scale of the image
22- 24 I3 --- Nx [151] Number of pixels along X-axis
26- 28 I3 --- Ny [151] Number of pixels along Y-axis
30- 32 I3 GHz Freq [150/250] Frequency of the observation
34- 36 I3 Kibyte Size [186] Size of the FITS file
38- 65 A28 --- FileName Name of the FITS file in subdirectory fits
67-112 A46 --- Title Title of the FITS file
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Acknowledgements:
Remi Adam, adam(at)lpsc.in2p3.fr
References:
Catalano et al., 2014A&A...569A...9C 2014A&A...569A...9C
(End) Patricia Vannier [CDS] 13-Jan-2015