Associazione Romana Astrofili

157 FRASSO SABINO 42,22945555N 12,81150555E 465m s.l.m.

Evolution of the Fundamental Plane for early-type galaxies up to z = 1.2

We studied the evolution of the Fundamental Plane in B- and g-bands, for two samples of early-type galaxies at 0.2 < z < 0.35 and 0.35 < z < 1.2. We found a difference in the intercept that can be interpreted as galaxies at < z > ~0.7 being 0.68 and 0.52 mag brighter in the B- and g-band respectively, than their local counterparts. From the study of the Kormendy relation, we found the existence of a population of very bright (-21.5 > M <SUB>g</SUB> > -22.5) and compact (Re < 2 kpc) galaxies of which only a small fraction of 0.4% exists at z = 0, and that would be responsible for...

2013 LN31

The UV to FIR spectral energy distribution of star-forming galaxies in the redshift desert

We analyze the rest-frame UV-to-near-IR spectral energy distribution (SED) of Lyman break galaxies (LBGs), star-forming (SF) BzK (sBzK), and UV-selected galaxies at 1.5 < z < 2.5 in the COSMOS, GOODS-North, and GOODS-South fields. Additionally, we complement the multi-wavelength coverage of the galaxies located in GOODS-North and GOODS-South fields with deep FIR data taken within the framework of the GOODS-Herschel project. According to their best-fitted SED-derived properties we find that, due to their selection criterion involving UV measurements, LBGs tend to be UV-brighter,...

Lyman break and ultraviolet-selected galaxies at z ˜ 1 - I. Stellar populations from the ALHAMBRA survey

We take advantage of the exceptional photometric coverage provided by the combination of GALEX data in the ultraviolet (UV) and the ALHAMBRA survey in the optical and near-infrared to analyse the physical properties of a sample of 1225 GALEX-selected Lyman break galaxies (LBGs) at 0.8 ≲ z ≲ 1.2 that are located in the COSMOS field. This is the largest sample of LBGs studied in this redshift range to date. According to a spectral energy distribution (SED) fitting with synthetic stellar population templates, we find that LBGs at z ˜ 1 are mostly young galaxies with a median age of 341...

A real-time data acquisition and elaboration system for instabilities control in the FTU tokamak