J/A+A/644/A93 ACT-CL J0215.4+0030 NIKA2 image (Keruzore+, 2020)
Exploiting NIKA2/XMM-Newton imaging synergy for intermediate mass, high-z galaxy
clusters within the NIKA2 SZ Large Program.
Observations of ACT-CL J0215.4+0030 at z∼0.9.
Keruzore F., Mayet F., Pratt G.W., Adam R., Ade P., Andre P.,
Andrianasolo A., Arnaud M., Aussel H., Bartalucci I., Beelen A., Benoit A.,
Berta S., Bourrion O., Calvo M., Catalano A., De Petris M., Desert F.-X.,
Doyle S., Driessen E.F.C., Gomez A., Goupy J., Kramer C., Ladjelate B.,
Lagache G., Leclercq S., Lestrade J.-F., Macias-Perez J.F., Mauskopf P.,
Monfardini A., Perotto L., Pisano G., Pointecouteau E., Ponthieu N.,
Reveret V., Ritacco A., Romero C., Roussel H., Ruppin F., Schuster K.,
Shu S., Sievers A., Tucker C.
<Astron. Astrophys. 644, A93 (2020)>
=2020A&A...644A..93K 2020A&A...644A..93K (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; X-ray sources
Keywords: galaxies: clusters: intracluster medium -
galaxies: clusters: individual: ACT-CL J0215.4+0030 -
techniques: high angular resolution - cosmology: observations
Abstract:
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 (M500~=3.5x1014M☉) 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 (SMG) 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 150GHz 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.
Description:
The NIKA2 observations used in this paper were conducted during the
fourteenth run of NIKA2 (N2R14). This run was one of those used for
the performance assessment of NIKA2 and is therefore thoroughly
described in Perotto et al. (2020A&A...637A..71P 2020A&A...637A..71P).
The observations of ACTCL J0215.4+0030 were performed in five sessions
from 17 to 22 January 2018. All sessions occurred between 16:00 and
22:15 UT. The focus of the telescope was checked at the beginning of
each session.
Objects:
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RA (2000) DE Designation(s)
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02 15 28.50 +00 30 37.3 ACTCL J0215.4+0030 = ACT-CL J0215.4+0030
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 106 1 Informations of fits file
fits/* . 1 Fits file
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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- 21 I2 --- Nx Number of pixels along X-axis
23- 24 I2 --- Ny Number of pixels along Y-axis
26- 44 A19 "datime" Obs.date Observation date
46 I1 --- Ext [4] Number of extensions (1)
48- 50 I3 Kibyte size Size of FITS file
52- 75 A24 --- FileName Name of FITS file, in subdirectory fits
77-106 A30 --- Title Title of the FITS file
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Note (1): file includes the following extensions:
HDU0: primary, empty
HDU1: NIKA2 1mm surface brightness map
HDU2: NIKA2 1mm noise standard deviation map
HDU3: NIKA2 2mm surface brightness map
HDU4: NIKA2 2mm noise standard deviation map
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Acknowledgements:
Florian Keruzore, keruzore(at)lpsc.in2p3.fr
(End) Patricia Vannier [CDS] 01-Dec-2020