Bibcode
Barrena, R.; Streblyanska, A.; Ferragamo, A.; Rubiño-Martín, J. A.; Aguado-Barahona, A.; Tramonte, D.; Génova-Santos, R. T.; Hempel, A.; Lietzen, H.; Aghanim, N.; Arnaud, M.; Böhringer, 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.
Bibliographical reference
Astronomy and Astrophysics, Volume 616, id.A42, 15 pp.
Advertised on:
8
2018
Journal
Citations
23
Refereed citations
22
Description
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 2.5 m Isaac
Newton telescope, the 3.5 m Telescopio Nazionale Galileo, the 4.2 m
William Herschel telescope and the 10.4 m 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.
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