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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.)

Gaia DR2 unravels incompleteness of nearby cluster population: new open clusters in the direction of Perseus

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Cantat-Gaudin, T. [1] ; Krone-Martins, A. [2] ; Sedaghat, N. [3] ; Farahi, A. [4] ; de Souza, R. S. [5] ; Skalidis, R. [6, 7, 8] ; Malz, I, A. ; Macedo, S. [9] ; Moews, B. [10] ; Jordi, C. [1] ; Moitinho, A. [2] ; Castro-Ginard, A. [1] ; Ishida, E. E. O. [11] ; Heneka, C. [12] ; Boucaud, A. [13, 14] ; Trindade, A. M. M. [15] ; Collaboration, COIN
Total Authors: 17
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[1] Univ Barcelona IEEC UB, Inst Ciencies Cosmos, Marti i Franques 1, Barcelona 08028 - Spain
[2] Univ Lisbon, Fac Ciencias, CENTRA, Ed C8, P-1749016 Lisbon - Portugal
[3] Univ Freiburg, Dept Comp Sci, Georges Koehler Allee 052, D-79110 Freiburg - Germany
[4] Carnegie Mellon Univ, McWilliams Ctr Cosmol, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 - USA
[5] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 - USA
[6] Univ Crete, Dept Phys, Iraklion 71003 - Greece
[7] Univ Crete, Inst Theoret & Computat Phys, Iraklion 71003 - Greece
[8] Fdn Res & Technol Hellas, IESL, Iraklion 7110 - Greece
[9] Inst Fed Educ Ciencia & Tecnol Pernambuco, IFPE, BR-50670430 Recife, PE - Brazil
[10] Univ Edinburgh, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian - Scotland
[11] Univ Clermont Auvergne, CNRS IN2P3, LPC, F-63000 Clermont Ferrand - France
[12] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa - Italy
[13] Univ Paris Saclay, CNRS IN2P3, Univ Paris Sud, LAL, Orsay - France
[14] Univ Paris Saclay, Paris Saclay Ctr Data Sci, Orsay - France
[15] Univ Porto, Inst Astrofis & Ciencias Espaco, CAUP, Rua Estrelas, P-4150762 Porto - Portugal
Total Affiliations: 15
Document type: Journal article
Source: Astronomy & Astrophysics; v. 624, APR 24 2019.
Web of Science Citations: 9

Context. Open clusters (OCs) are popular tracers of the structure and evolutionary history of the Galactic disc. The OC population is often considered to be complete within 1.8 kpc of the Sun. The recent Gaia Data Release 2 (DR2) allows the latter claim to be challenged. Aims. We perform a systematic search for new OCs in the direction of Perseus using precise and accurate astrometry from Gaia DR2. Methods. We implemented a coarse-to-fine search method. First, we exploited spatial proximity using a fast density-aware partitioning of the sky via a k-d tree in the spatial domain of Galactic coordinates, (l, b). Secondly, we employed a Gaussian mixture model in the proper motion space to tag fields quickly around OC candidates. Thirdly, we applied an unsupervised membership assignment method, UPMASK, to scrutinise the candidates. We visually inspected colour-magnitude diagrams to validate the detected objects. Finally, we performed a diagnostic to quantify the significance of each identified over-density in proper motion and in parallax space. Results. We report the discovery of 41 new stellar clusters. This represents an increment of at least 20% of the previously known OC population in this volume of the Milky Way. We also report on the clear identification of NGC 886, an object previously considered an asterism. This study challenges the previous claim of a near-complete sample of OCs up to 1.8 kpc. Our results reveal that this claim requires revision, and a complete census of nearby OCs is yet to be found. (AU)

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 Opportunities: Multi-user Equipment Program
FAPESP's process: 14/13407-4 - Astrometry in the solar neighbourhood, preparation and exploration of space missions
Grantee:Ramachrisna Teixeira
Support Opportunities: Regular Research Grants