Seven Problems Related to the Determination of the Primordial Helium Abundance
Recent advances on the quest to determine the primordial or pregalactic helium abundance, Yp, are reviewed. There are seven problems affecting the He/H...
The study of the IR emission from Seyfert galaxies is of key importance for understanding the origin of the extraordinary nuclear activity seen in these objects...
We show the results of a mid and far IR study of ISO data of the CfA Seyfert sample. These data allow a detailed study of the far IR Spectral Energy...
Seyfert Galaxies: A Perspective with the Infrared Space Observatory (ISO)
We present data from the Infrared Space Observatory (ISO) of a complete set of Seyfert galaxies (Seyfert 1 and Seyfert 2) in a wavelength range seldom explored...
Most previous work studying the possible relation between the presence of non-axisymmetric structures such as bars and rings in a galaxy, and the presence of...