top of page
Bem-vindos! | Welcome! | ¡Bienvenido!
Research projects
Modelling the Dark Matter distribution in Milky Way analog galaxies
Our current understanding of how dark matter (DM) is distributed within the Milky Way halo, particularly in the solar neighborhood, is based on either careful studies of the local stellar orbits, model assumptions on the global shape of the MW halo, or from direct acceleration measurements. In this work, we undertake a study of external galaxies, with the intent of providing insight to the DM distribution in MW-analog galaxies. Through a careful decomposition of their RCs into their baryonic (stars, gas) and DM components (see Figure below), we isolate the DM contribution by using an MCMC-based approach. We put forward a window for the DM density (ρ=0.21-0.55 GeV/cm^3) at these galactocentric distances in our MW analog sample, consistent with the values found for the MW's local DM density, based on more traditional approaches found in the literature.
Participants:
Natanael G. de Oliveira (UFRJ & NRAO, Brazil & USA)
Prof. Dr. Karín Menéndez-Delmestre (UFRJ, Brazil)
N. G. de Isídio et al. (2024)
CANGa Survey - PI: Karín Menéndez-Delmestre (2017 - present)
Census of Austral Nearby Galaxies (CANGa Survey)
The Census of Austral Nearby GAlaxies (CANGA survey) entails a study the past formation history of galaxies in a pixel-by-pixel approach. The program consists of an ongoing observational campaign using the Southern Astrophysical Research (SOAR) Telescope (4.1 m, Chile). The CANGA survey will be a great step for Brazilian extragalactic astronomy, complementing the exquisite work that has been performed by the Sloan Digital Sky Server (SDSS) in the northern hemisphere. Our data, however, will be 15 times more sensitive opening up the stage for deep spatially-resolved stellar population analysis of faint galaxy regions, including disk outskirts, where tell-tale signs of the dark matter halo spatial distribution can be studied. Largely surpassing SDSS sensitivity, this program is the beginning of the deepest mapping of nearby galaxies in the southern hemisphere. The synergistic value with the ALMA radio interferometers in Chile, the European MUSE integral field spectrograph in the optical, Meerkat radio telescope in South Africa and further into the future, the Square Kilometre Array (SKA), renders this program one of great potential.
Participants:
Karín Menéndez-Delmestre - PI
Thiago Signorini Gonçalves - PI
Natanael G. de Isídio - Member
and other LASEX members.
You can fid more about it here!
SOAR Telescope; used for CANGa imaging
Subjects of interest
- Galaxy formation and evolution
- Galaxy kinematics and dynamics;
- ISM in nearby galaxies;
- ISM in high-z galaxies;
- Simulations;
- Dwarf galaxies;
- Observational Cosmology
- ISM in high-z galaxies;
- Cosmological simulations;
- Data science
Other interests:
- Projects that promote diversity, equity, and
social and gender inclusion in science.
European Southern Observatory
© 2024 by Natanael Gomes de Oliveira Isídio
bottom of page