Inicio: 12:00h
Ponente: Karina Carolina Maucó (Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México)
Lugar: Sala Alberto Lobo (ICE building, Campus UAB)

Planetary systems have long been known to form from the gas and dust of circumstellar disks. However, the study of several important physical processes, such as dust growth, photoevaporation or disk dispersal, requires observations across a wide range of wavelengths and at different evolutionary stages. In this talk I will show the results of the modeling of the spectral energy distributions of ~30 T Tauri stars in the Orion OB1 sub-asociations which have been observed with Herschel at 70 and 160 um. Our objects have ages in the range of ~3-10 Myr. Several objects revealed the presence of holes and gaps, likely produced by the dynamical interaction between the disks and young planets in them. In the sigma Ori cluster we found clear evidence of external photoevaporation due to the radiation from the multiple-star system at its center. VLA observations show free-free emission associated with ionized gas for some sources. They also exhibit forbidden optical emission lines related with photoevaporating winds in high resolution spectra taken with MIKE at the Las Campanas Observatory in Chile.

Inicio: 12:15h
Ponente: Ismael Ferrero (ICE)
Lugar: Alberto Lobo

I will present the results after analysing the ability of the standard cold dark matter model with cosmological constant (ΛCDM) to reproduce observational results of the dynamics of galaxies. Using rotation curves of dwarf galaxies compiled from the literature, it is shown that the galaxy formation efficiency represents a severe challenge at the low stellar mass of dwarf galaxies for this prevailing cosmological model. I will also show what is the process of creating a synthetic catalogs of galaxies through the implementation of the halo occupation distribution (HOD) in cosmological simulations, an efficient way to model the halo-galaxy connection.