Associazione Romana Astrofili

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

Primo incontro cittadino contro l'inquinamento luminoso della Capitale

A 13 anni quasi perfettamente compiuti dalla Legge Regionale Lazio n. 23 del 13 aprile 2000 contro l’inquinamento luminoso e per l’uso razionale dell’energia, l’inquinamento luminoso provocato dalle luci artificiali della Capitale é ben lungi dall’essere limitato o controllato. Questo primo decennio del Terzo Millennio é trascorso – sotto questo punto di vista – pressocché inutilmente. 13 anni di impegni e denunce non son bastati a dare effettiva attuazione della norma per cui tanto ci si era battuti sulla fine del millennio. Soltanto nel 2005 si é riusciti a “strappare”, non senza...

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FIR measurements of Ly-$\alpha$ emitters at z$\lesssim$1.0: dust attenuation from PACS-\emph{Herschel}

One remaining open question regarding the physical properties of Ly$\alpha$ emitters (LAEs) is their dust content and its evolution with redshift. The variety of results is large and with those reported by now is difficult to establish clear relations between dust, other fundamental parameters of galaxies (star-formation rate, metallicity or age) and redshift. In this Letter, we report \emph{Herschel} PACS-100$\mu$m, PACS-160$\mu$m and \emph{Spitzer} MIPS-24$\mu$m detections of a sample of spectroscopically GALEX-selected LAEs at z$\sim$0.3 and $\sim$1.0. Five out of ten and one out...

Evolution of the Fundamental Plane of 0.2<z<1.2 Early-type galaxies in the EGS

The Fundamental Plane relates the structural properties of early-type galaxies such as its surface brightness and effective radius with its dynamics. The study of its evolution has therefore important implications for models of galaxy formation and evolution. This work aims to identify signs of evolution of early-type galaxies through the study of parameter correlations using a sample of 135 field galaxies extracted from the Extended Groth Strip in the redshift range 0.2<z<1.2. Using DEEP2 data, we calculate the internal velocity dispersions by extracting the stellar kinematics from...

OTELO survey: optimal emission-line flux determination with OSIRIS/GTC

Emission-line galaxies are important targets for understanding the chemical evolution of galaxies in the universe. Deep, narrow-band imaging surveys allow to detect and study the flux and the equivalent widths (EW) of the emission line studied. The present work has been developed within the context of the OTELO project, an emission line survey using the Tunable Filters (TF) of OSIRIS, the first generation instrument on the GTC 10.4m telescope located in La Palma, Spain, that will observe through selected atmospheric windows relatively free of sky emission lines. With a total survey...