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Observational mission NTT/EFOSC2 - ESO/Chile

Grant number: 19/19655-3
Support type:Scholarships abroad - Research
Effective date (Start): February 18, 2020
Effective date (End): February 24, 2020
Field of knowledge:Physical Sciences and Mathematics - Astronomy
Principal Investigator:Ramachrisna Teixeira
Grantee:Ramachrisna Teixeira
Host: Christine Ducourant
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Local de pesquisa : European Southern Observatory, La Serena (ESO), Chile  

Abstract

In April 2018 the European Spatial Agency (ESA) and the Gaia Data Processing Analysis Consortium (DPAC), published the second Gaia Data Release (GDR2) with the complete astrometry and Gaia photometry for plus than one billion objects, among them 550 thousand known quasars. These data were obtained after 22 months of observations performed by the satellite since July 2014. Aiming to explorer these data, 4 years ago we created a group, Gaia Gravitational Lensing, with 10-12 researchers from various countries, with the main goal to discovery new strong gravitational lenses and to build an all sky survey of gravitational lenses with an unprecedent resolution (180 mas). With this survey we intend to contribute significantly with studies in dark matter, galaxies evolution and cosmology. The first step of this effort was the compilation of a list of candidates based on the Gaia astrometry and photometry, list of known quasars and simulations of configurations. Through spectroscopic observations like these (NTT/EFOSC2), focus of this request for funds, we could confirm one more four-component and two two-component candidates, with two other probable confirmations awaiting treatment. In the southern hemisphere we obtained for this second period of the year, observation time in Gemini in "queue mode" and NTT "visitor mode" with which we hope to validate the nature of other candidates. It is precisely to carry out this observational mission to the NTT that I am requesting funds.