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  Optical validation and characterisation of Planck PSZ1 sources at the Canary Islands observatories - II. Second year of ITP13 observations

Barrena, R., Ferragamo, A., Rubiño-Martín, J. A., Streblyanska, A., Aguado-Barahona, A., Tramonte, D., et al. (2020). Optical validation and characterisation of Planck PSZ1 sources at the Canary Islands observatories - II. Second year of ITP13 observations. Astronomy and Astrophysics, 638: A146. doi:10.1051/0004-6361/202037552.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-F9A7-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-F9A8-4
Genre: Journal Article

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Barrena, R., Author
Ferragamo, A., Author
Rubiño-Martín, J. A., Author
Streblyanska, A., Author
Aguado-Barahona, A., Author
Tramonte, D., Author
Génova-Santos, R. T., Author
Hempel, A., Author
Lietzen, H., Author
Aghanim, N., Author
Arnaud, M., Author
Böhringer, H.1, Author              
Chon, G.1, Author              
Dahle, H., Author
Douspis, M., Author
Lasenby, A. N., Author
Mazzotta, P., Author
Melin, J. B., Author
Pointecouteau, E., Author
Pratt, G. W., Author
Rossetti, M., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We report new galaxy clusters previously unknown included in the first Planck Sunyaev–Zeldovich (SZ) sources catalogue, the PSZ1. The results presented here were achieved during the second year of a two-year observational programme, the ITP13, developed at the Roque de los Muchachos Observatory (La Palma, Spain). 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 characterised 75 SZ sources with low SZ significance, SZ S/N <  5.32. We performed deep optical imaging and spectroscopy in order to associate actual galaxy clusters with the SZ Planck source. We adopted robust criteria, based on the 2D spatial distribution, richness, and velocity dispersions to confirm actual optical counterparts up to z <  0.85. The selected systems are confirmed only if they are well aligned with respect to the PSZ1 coordinate and show high richness and high velocity dispersion. In addition, we also inspected the Compton y-maps and SZ significance in order to identify unrealistic detections. Following this procedure, we identify 26 cluster counterparts associated with the SZ emission, which means that only about 35% of the clusters considered in this low S/N PSZ1 subsample are validated. Forty-nine SZ sources (∼65% of this PSZ1 subset) remain unconfirmed. At the end of the ITP13 observational programme, we have studied 256 SZ sources with Dec ≥ −15° (212 of them completely unknown), finding optical counterparts for 152 SZ sources. The ITP13 validation programme has allowed us to update the PSZ1 purity, which is now more refined, increasing from 72% to 83% in the low SZ S/N regime. Our results are consistent with the predicted purity curve for the full PSZ1 catalogue and with the expected fraction of false detections caused by the non-Gaussian noise of foreground signals. We find a strong correlation between the number of unconfirmed sources and the thermal emission of diffuse galactic dust at 857 GHz, thus increasing the fraction of false Planck SZ detections at low galactic latitudes.

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Language(s): eng - English
 Dates: 2020-06-26
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202037552
Other: LOCALID: 3251757
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 638 Sequence Number: A146 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1