Group Research

- Radiosupernovae.
- Quasars and Active Galactic Nuclei.
- High Precission Differential Astrometry.
- Radiostars.
- Gravitational Lenses.
- New Instruments (ALMA, SKA).

MAIN CONTRIBUTIONS

Radiosupernovae

Discovery of the first shell-like radiosupernova structure (Marcaide et al. Nature, 373, 44, 1995).

First film of a supernova expansion (Marcaide et al. Science, 270, 1475, 1995).

(Movie of the SN1993J supernova expansion)

(Images of the SN1993J expansion through 10 years)

(Images of the SN1993J expansion published in Science)

First determination of deceleration in the expansion of a supernova (Marcaide et al. ApJL, 486, L31, 1997).

Creation of a supernovae radio emission simultation code (Pérez-Torres, Alberdi y Marcaide, A&A, 374, 997, 2001).

High Precission Astrometry

First detection of the low mass companion of a radiostar by astrometric methods (Guirado et al., ApJ, 490, 835, 1997).

Demonstration of the possibility of making High Precission Differential Astrometry in high resolution VLBI observations, as much at millimeter wavelengths (Guirado et al., A&A, 353, L37, 2000) as with space antennas, using the HALCA japanese satellite of the VSOP project (Guirado et al., A&A, 371, 766, 2001).

Gravitational Lenses

Determination of the mass distribution and identification of a new galaxy in the MGJ0414+0534 quad lens, solving a previous disagreement of other researchers, with the highest quality VLBI observations ever obtained of the source.