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7 papers · 1 filter
The structure of halos in Self-Interacting Cold Dark Matter models
P. Colin, V. Avila-Reese, O. Valenzuela +1
High-resolution numerical simulations were performed to study the structure and substructure of Milky Way- and cluster-sized halos in a LCDM cosmology with self-interacting (SI) da…
Distance scale and variable stars in Local Group Galaxies: LMC and Fornax
M. Maio, L. Baldacci, G. Clementini +10
We briefly review our photometric and spectroscopic study of RR Lyrae variable stars in the bar of the Large Magellanic Cloud (LMC), that allowed us to reconcile the so-called "sho…
Star formation and turbulent dissipation in models of disk galaxy evolution
V. Avila-Reese, C. Firmani, E. Vazquez-Semadeni
The kinetic energy dissipation rate in the turbulent ISM of disk galaxies is a key ingredient in galaxy evolution models since it determines the effectiveness of large-scale star f…
Physical processes behind the morphological Hubble sequence
C. Firmani, V. Avila-Reese
The study of formation and evolution of galaxies is reviewed, making emphasis on the physical factors which are important to understand the origin of the galaxy Hubble sequence. We…
A New Sample of Distant Compact Groups From DPOSS
A. Iovino, R. de Carvalho, R. Gal +4
We have identified eighty-four small, high density groups of galaxies out to z ~ 0.2 in a region of ~ 2000 square degrees around the north galactic pole using DPOSS (the Digitized…
Hard GRB spectra: thermal vs non-thermal emission
G. Ghirlanda, A. Celotti, G. Ghisellini
We consider the evidence for very hard low energy spectra during the prompt phase of Gamma Ray Bursts (GRB). In particular we examine the spectral evolution of GRB 980306 together…