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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

J-PLUS: On the identification of new cluster members in the double galaxy cluster A2589 and A2593 using PDFs

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Molino, A. [1, 2] ; Costa-Duarte, M. V. [1, 3] ; Mendes de Oliveira, C. [1] ; Cenarro, A. J. [4] ; Lima Neto, G. B. [1] ; Cypriano, E. S. [1] ; Sodre, Jr., L. [1] ; Coelho, P. [1] ; Chow-Martinez, M. [5, 6] ; Monteiro-Oliveira, R. [1, 7] ; Sampedro, L. [1, 2] ; Cristobal-Hornillos, D. [4] ; Varela, J. [4] ; Ederoclite, A. [4] ; Chies-Santos, A. L. [7] ; Schoenell, W. [1] ; Ribeiro, T. [8] ; Marin-Franch, A. [4] ; Lopez-Sanjuan, C. [4] ; Hernandez-Fernandez, J. D. [1] ; Cortesi, A. [1] ; Vazquez Ramio, H. [4] ; Santos, Jr., W. [1] ; Cibirka, N. [1] ; Novais, P. [1] ; Pereira, E. [1] ; Hernandez-Jimenez, J. A. [1] ; Jimenez-Teja, Y. [9] ; Moles, M. [4] ; Benitez, N. [2] ; Dupke, R. [9]
Total Authors: 31
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, BR-05508090 Sao Paulo - Brazil
[2] CSIC, IAA, Glorieta Astron S-N, E-18008 Granada - Spain
[3] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden - Netherlands
[4] Ctr Estudios Fis Cosmos Aragon, Plaza San Juan 1, Teruel 44001 - Spain
[5] Univ Guanajuato, Dept Astron, DCNE, Apdo Postal 144, Guanajuato 36000 - Mexico
[6] Univ Nacl Autonoma Nicaragua, Ctr Invest Geocient, Inst Geol & Geofis, Rotonda Univ 200 Metros Este, Managua - Nicaragua
[7] Univ Fed Rio Grande do Sul, Inst Fis, Dept Astron, BR-15051 Porto Alegre, RS - Brazil
[8] Univ Fed Sergipe, Dept Fis, Ave Marechal Rondon S-N, BR-49100000 Sao Cristovao, SE - Brazil
[9] COAA, Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro - Brazil
Total Affiliations: 9
Document type: Journal article
Source: Astronomy & Astrophysics; v. 622, FEB 21 2019.
Web of Science Citations: 8

Aims. We aim to use multiband imaging from the Phase-3 Verification Data of the J-PLUS survey to derive accurate photometric redshifts (photo-z) and look for potential new members in the surroundings of the nearby galaxy clusters A2589 (z = 0.0414) \& A2593 (z = 0.0440), using redshift probability distribution functions (PDFs). The ultimate goal is to demonstrate the usefulness of a 12-band filter system in the study of largescale structure in the local Universe. Methods. We present an optimized pipeline for the estimation of photometric redshifts in clusters of galaxies. This pipeline includes a PSF-corrected photometry, specific photometric apertures capable of enhancing the integrated signal in the bluest filters, a careful recalibration of the photometric uncertainties and accurate upper-limit estimations for faint detections. To foresee the expected precision of our photo-z beyond the spectroscopic sample, we designed a set of simulations in which real cluster galaxies are modeled and reinjected inside the images at different signal-to-noise ratio (S/N) levels, recomputing their photometry and photo-z estimates. Results. We tested our photo-z pipeline with a sample of 296 spectroscopically confirmed cluster members with an averaged magnitude of < r > = 16.6 and redshift < z > = 0.041. The combination of seven narrow and five broadband filters with a typical photometric-depth of r similar to 21.5 provides delta(z)/(1 + z) = 0.01 photo-z estimates. A precision of delta(z)/(1 + z) = 0.005 is obtained for the 177 galaxies brighter than magnitude r < 17. Based on simulations, a delta(z)/(1 + z) = 0.02 and delta(z)/(1 + z) = 0.03 is expected at magnitudes < r > = 18 and < r > = 22, respectively. Complementarily, we used SDSS/DR12 data to derive photo-z estimates for the same galaxy sample. This exercise demonstrates that the wavelength-resolution of the J-PLUS data can double the precision achieved by SDSS data for galaxies with a high S/N. Based on the Bayesian membership analysis carried out in this work, we find as much as 170 new candidates across the entire field (similar to 5 deg(2)). The spatial distribution of these galaxies may suggest an overlap between the systems with no evidence of a clear filamentary structure connecting the clusters. This result is supported by X-ray Rosat All-Sky Survey observations suggesting that a hypothetical filament may have low density contrast on diffuse warm gas. Conclusions. We prove that the addition of the seven narrow-band filters make the J-PLUS data deeper in terms of photo-z-depth than other surveys of a similar photometric-depth but using only five broadbands. These preliminary results show the potential of J-PLUS data to revisit membership of groups and clusters from nearby galaxies, important for the determination of luminosity and mass functions and environmental studies at the intermediate and low-mass regime. (AU)

FAPESP's process: 14/18632-6 - The cosmic web described by superclusters of galaxies
Grantee:Marcus Vinícius Costa Duarte
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/13723-3 - Galaxy clusters as portals to the dark universe
Grantee:Eduardo Serra Cypriano
Support type: Regular Research Grants
FAPESP's process: 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Multi-user Equipment Program
FAPESP's process: 16/05254-9 - Investigating galaxy clusters in the photometric redshift space
Grantee:Marcus Vinícius Costa Duarte
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 14/11806-9 - Challenges for the new generation of wide-field photometric redshift surveys like J-PAS
Grantee:Alberto Molino Benito
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/00800-4 - The 3-D universe: astrophysics with large galaxy surveys
Grantee:Laerte Sodré Junior
Support type: Research Projects - Thematic Grants
FAPESP's process: 09/54202-8 - Acquisition of a robotic telescope for the Brazilian astronomical community
Grantee:Claudia Lucia Mendes de Oliveira
Support type: Multi-user Equipment Program
FAPESP's process: 11/51680-6 - Exploring the universe: from the galaxies formation to Earth-like planets with the Giant Magellan Telescope
Grantee:Laerte Sodré Junior
Support type: Special Projects