La constante de Hubble en la era de la cosmología de precisión
Abstract
During the last decade, several "precision cosmology" experiments have obtained high-quality measurements of the cosmic microwave background radiation, discovered the signature of baryon acoustic oscillations at low redshifts, and acquired large samples of type Ia supernovae at high redshifts. The combination of all these observations has enabled a constraint on the parameter of the equation of state of dark energy (w) at the 10% level. The Hubble constant (H_0 ) is one of the basic parameters of observational cos- mology that can contribute to a significant reduction on the allowed range of w, provided it is measured with sufficient accuracy and precision. Moti- vated by this goal, the SH0ES project was started in 2006 with the goal of measuring H_0 with an uncertainty below 5%. Some of the key factors that made this project possible were the adoption of the galaxy Messier 106 as the first rung in the Extragalactic Distance Scale and the use of the Hubble Space Telescope to carry out all observations without introducing additional systematic errors. I will present the results of this project and some prelim- inary results from the ReSH0ES project, which uses the newly-installed WFC3 camera on Hubble to achieve a further reduction of the uncertainty in H_0 .
FULL TEXT IN SPANISH- Publication:
-
Boletin de la Asociacion Argentina de Astronomia La Plata Argentina
- Pub Date:
- 2010
- Bibcode:
- 2010BAAA...53..337M