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

Scritto il 02 Lug 2013 alle 01:39 in Pubblicazioni

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 Myr and…

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

Scritto il 25 Giu 2013 alle 01:40 in Pubblicazioni

A real-time data acquisition and elaboration system is being implemented
to control the new ECH launcher recently installed at FTU (Frascati
Tokamak Upgrade). The system is aimed at controlling different kinds of
magnetohydrodynamic instabilities, in particular the deleterious 3/2 and
2/1 (neoclassical) tearing modes, (N)TM, and the saw teeth period in
order to prevent the seeding of NTMs. The complete system is presented
here together with preliminary offline and real-time tests. © 2001
Elsevier Science.

Prossime Aperture Pubbliche

Scritto il 13 Giu 2013 alle 17:12 in News

Vi ricordiamo che la prossima aperture pubblica dell’osservatorio di Frasso Sabino si terrà il 15 Giugno p.v.

L’apertura pubblica successiva si terrà il 20 luglio p.v. dove si terrà la conferenza “L’astrolabio” del nostro socio Leonardo di Emanuele.

Come per tutte le aperture estive, l’orario di inizio è attorno alle 18 fino alle 20, per poi riaprire dalle 22 in poi per le osservazioni serali.

Non è necessario prenotare, ma ovviamente se pensate di organizzare una comitiva di qualche decina di persona è gradito un avviso!

Getting to Know the Cataclysmic Variable Beneath the Nova Eruption

Scritto il 11 Giu 2013 alle 01:39 in Pubblicazioni

The eruption of a (classical) nova is widely accepted to be a recurrent
event in the lifetime of a cataclysmic binary star. In-between eruptions
the system should therefore behave as a ``normal'' cataclysmic variable
(CV), i.e. according to its characteristic properties like the
mass-transfer rate or the strength of the magnetic field of the white
dwarf. How important are these characteristics for the nova eruption
itself, i.e. which type of systems preferably undergo a nova eruption?
This question could in principle be addressed by comparing the post-nova
systems with the general CV…

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