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Seminario de Astronomía "Extinction law in the inner Milky Way as revealed by the VVV survey"

Fecha

Jueves 09 de Noviembre de 2017

Hora

12:15 hrs.

Lugar

Sala de Conferencias Federico Ristenpart (Camino El Observatorio 1515, Departamento de Astronomía, Edificio Central, piso 3, Las Condes, Santiago, Chile)

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Seminario de Astronomía Extinction law in the inner Milky Way as revealed by the VVV survey

Seminario de Astronomía "Extinction law in the inner Milky Way as revealed by the VVV survey"

Enlaces relacionados
Departamento de Astronomía FCFM Universidad de Chile

CHARLISTA
Dr. Javier Alonso-García
Universidad de Antofagasta / Millenium Institue of Astrophysics

TÍTULO
Extinction law in the inner Milky Way as revealed by the VVV survey

ABSTRACT
The Vista Variables in the Via Lactea (VVV) near-infrared photometric survey, and its extension, the VVV-X survey, have been changing our picture of the inner Galaxy in the last years. The inner regions of our Galaxy are hidden behind curtains of gas and dust, and their observations at visible wavelengths are severely hampered by this fact. Observations in the near-infrared are better suited due to the diminished effect of extinction at these wavelengths. Using PSF photometry on the VVV images, we have produced a deep and highly complete color-magnitude diagram (CMD) with nearly one billion sources, that gives us an unprecedented view of the Galactic bulge and inner disc. In my talk, I will present this giga-CMD to provide a description of the stellar populations residing in it, and using different types of stars (red clump, RRLyrae), better characterize the extinction law towards the Galactic bulge, and provide accurate empirical selective-to-total extinction ratios, which show smaller values than those provided in previous studies at these wavelengths.

Rene A. Mendez
Seminar Coordinator
DAS/UChile - rmendez@uchile.cl

Organiza
Departamento de Astronomía FCFM U. de Chile.
Contacto
Nicolás Álvarez - +56 2 29771146 -

Comunicaciones Depto. Astronomía FCFM U. de Chile

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http://uchile.cl/i137907
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