Using hydrodynamical simulations in a cosmological Λ-CDM model, we investigate the role played by mergers and interactions in the regulation of star formation (SF) activity and other internal properties of galaxies.

FRIDA has been conceived as the first science instrument for the adaptive optics system of the Gran Telescopio Canarias (GTC). It is designed to be installed at the Nasmyth A platform, behind the GTC adaptive optics system. FRIDA will be a diffraction limited, near infrared imager and integral field spectrograph sensitive from 0.9 to 2.5 μm. It may

FRIDA (inFRrared Imager and Dissector for the Adaptive optics system of the Gran Telescopio Canarias) is being designed as a diffraction limited instrument with broad and narrow band imaging and integral field spectroscopy capabilities to operate in the wavelength range 0.9 - 2.5 μm. FRIDA is a collaborative project between the main GTC partners

Observations of quiescent filaments show fine-scale structures, suggesting that they can be composed of small-scale threads or fibrils. Here, we study the oscillations of group of periodic fibrils in a Cartesian geometry using Bloch's theorem. The periodic array of fibrils provides a bridge between the seemingly different oscillations of a finite

We study the effects of a possible joint variation of the electron mass and the fine structure constant on the CMBR temperature fluctuation spectrum. We use the first-year WMAP (Bennet et al. 2003) data to estimate the values of the fine structure constant and of the electron mass at the decoupling time.

Apparent ZAHB F555W magnitude for 72 Galactic globular clusters, corresponding distance modulus in F555W, the reddening in flight system E(F439W-F555W) , the reddening in Johnson system E(B-V) and the metallicity in the Zinn & West (1984ApJS...55...45Z) and Carretta & Gratton (1997A&AS..121...95C) scales. (1 data file).