J/A+A/616/A42 Clusters candidates from PSZ1 catalogue (Barrena+, 2018)
Optical validation and characterization of Planck PSZ1 sources at the
Canary Islands observatories. I. First year of ITP13 observations.
Barrena R., Streblyanska A., Ferragamo A., Rubino-Martin J.A.,
Aguado-Barahona A., Tramonte D., Genova-Santos R.T., Hempel A., Lietzen H.,
Aghanim N., Arnaud M., Bohringer H., Chon G., Democles J., Dahle H.,
Douspis M., Lasenby A.N., Mazzotta P., Melin J.B., Pointecouteau E.,
Pratt G.W., Rossetti M., van der Burg R.F.J.
<Astron. Astrophys., 616, A42 (2018)>
=2018A&A...616A..42B 2018A&A...616A..42B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Optical ; Redshifts
Keywords: large-scale structure of Universe - galaxies: clusters: general -
catalogs
Abstract:
We have identified new clusters and characterized previously unknown
Planck Sunyaev-Zeldovich (SZ) sources from the first Planck catalogue
of SZ sources (PSZ1). The results presented here correspond to an
optical follow-up observational programme developed during
approximately one year (2014) at Roque de los Muchachos Observatory,
using the 2.5m Isaac Newton telescope, the 3.5m Telescopio Nazionale
Galileo, the 4.2m William Herschel telescope and the 10.4m Gran
Telescopio Canarias. We have characterized 115 new PSZ1 sources using
deep optical imaging and spectroscopy. We adopted robust criteria in
order to consolidate the SZ counterparts by analysing the optical
richness, the 2D galaxy distribution, and velocity dispersions of
clusters. Confirmed counterparts are considered to be validated if
they are rich structures, well aligned with the Planck PSZ1 coordinate
and show relatively high velocity dispersion. Following this
classification, we confirm 53 clusters, which means that 46% of this
PSZ1 subsample has been validated and characterized with this
technique. Sixty-two SZ sources (54% of this PSZ1 subset) remain
unconfirmed. In addition, we find that the fraction of unconfirmed
clusters close to the galactic plane (at |b|<25°) is greater than
that at higher galactic latitudes (|b|>25°), which indicates
contamination produced by radio emission of galactic dust and gas
clouds on these SZ detections. In fact, in the majority of the cases,
we detect important galactic cirrus in the optical images, mainly in
the SZ target located at low galactic latitudes, which supports this
hypothesis.
Description:
Our reference cluster sample is PSZ1 (Planck Collaboration XXIX,
2014A&A...571A..29P 2014A&A...571A..29P, Cat. VIII/91; Planck Collaboration XXXII, 2015,
Cat. J/A+A/581/A14). This catalogue includes 1227 clusters and cluster
candidates derived from SZ effect detections using all-sky maps
produced within the first 15.5 months of Planck observations.
All observations were carried out at Roque de los Muchachos
Observatory (ORM) on the island of La Palma (Spain) within the
framework of the International Time Programme ITP13B-15A. The dataset
was obtained in multiple runs from August 2013 to July 2014, as part
of this two-year observing programme.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 171 123 Clusters candidates from the PSZ1 catalogue
studied in this work
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See also:
VIII/91 : Planck Catalog of Compact Sources Release 1 (Planck, 2013)
J/A+A/581/A14 : Updated Planck catalogue PSZ1 (Planck+, 2015)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID PSZ1 identification number
5- 6 A2 --- m_ID Multiplicity index on ID (1)
7 A1 --- n_ID [a] Note on redshifts (2)
9- 26 A18 --- PSZ1 Planck name (PSZ1 GLLL.ll+BB.bb)
28- 31 F4.2 --- SZSNR ?=- SZ significance reported in the PSZ1
catalogue (signal-to-noise ratio of the
detection )
33- 34 I2 h RAh ?=- Most luminous cluster member
Right ascension (J2000)
36- 37 I2 min RAm ? Most luminous cluster member
Right ascension (J2000)
39- 43 F5.2 s RAs ? Most luminous cluster member
Right ascension (J2000)
45 A1 --- DE- Most luminous cluster member
Declination sign (J2000)
46- 47 I2 deg DEd ?=- Most luminous cluster member
Declination (J2000)
49- 50 I2 arcmin DEm ? Most luminous cluster member
Declination (J2000)
52- 56 F5.2 arcsec DEs ? Most luminous cluster member
Declination (J2000)
58- 62 F5.2 arcmin Dist ? Distance between the optical and SZ centres
64- 68 F5.3 --- ?=- Mean spectroscopic redshift
70- 75 F6.4 --- zspBCG ?=- BCG spectroscopic redshift (if observed)
77- 78 I2 --- Nmembsp ? Number of luster members with
spectroscopic measurements
80- 83 F4.2 --- zphot ? Photometric redshift
85- 88 F4.2 --- e_zphot ? rms uncertainty on zphot
90- 92 I3 --- R ?=- Optical richness
94- 97 F4.1 --- e_R ? uncertainty on R
99-100 A2 --- Flag [123 ND] Custer classification (3)
102-171 A70 --- Notes Notes
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Note (1): SZ targets identified with the ID followed by an "A", "B" or "C"
label indicate the presence of multiple counterparts.
Note (2): Note on redshifts as follows:
a = photometric and/or spectroscopic redshift obtained from SDSS DR12 data.
Note (3): Cluster classification flag as follows:
Flag Spectroscopy σRV limit R (Ngal) Dist
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1 Yes >500; 0<z<0.2 >15 <5'
1 Yes >650; z > 0.2 >15 <5'
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2 No NA >15 <5'
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3 Yes <500; 0<z<0.2 >15 <5'
3 Yes <650; z> 0.2 >15 <5'
3 No - >15 >5'
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ND - - ≤15 -
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Oct-2018