We present time-series photometric and spectroscopic data for seven old
novae. They are used to derive the orbital period for the systems V365
Car (5.35 h), AR Cir (5.14 h), V972 Oph (6.75 h), HS Pup (6.41 h), V373
Sct (3.69 h), V909 Sgr (3.43 h) and CN Vel (5.29 h). Their addition
increases the number of orbital periods for novae by ~10 per cent. The
eclipsing nature of V909 Sgr is confirmed, and in three other cases
(V365 Car, Ar Cir and V373 Sct) we detect significant photometric
orbital variability with amplitudes >=0.2 mag in R. The resulting
period distribution is briefly…
In this work, we report the Photodetector Array Camera and Spectrometer
(PACS) 100 μm/160 μm detections of a sample of 42 GALEX-selected
and far-infrared (FIR)-detected Lyman break galaxies (LBGs) at z ˜
1 located in the Cosmic Evolution Survey (COSMOS) field and analyse
their ultraviolet (UV) to FIR properties. The detection of these LBGs in
the FIR indicates that they have a dust content high enough so that its
emission can be directly detected. According to a spectral energy
distribution (SED) fitting with stellar population templates to their
UV-to-near-IR observed photometry,…
Alla prossima apertura pubblica, il 12 ottovre p.v., l’Associazione Romana Astrofili parteciperà all’evento internazionale “International Observe The Moon Night”, una serata tutta dedicata al nostro satellite.
Sarà possibile come sempre visitare il nostro museo delle Stelle e vedere il nostro telescopio scientifico, ma la protagonista della serata sarà la Luna, con una conferenza dal titolo “Da Frasso alla Luna” e con i telescopi dell’Associazione tutti puntati su di lei!
We performed a thorough analysis of the star formation activity in the
young massive galaxy cluster RXJ1257+4738 at z=0.866, with emphasis on
the relationship between the local environment of the cluster galaxies
and their star formation activity. We present an optical and IR study
that benefited from the large amount of data available for this cluster,
including new OSIRIS/GTC and Herschel imaging observations. Using a
optical-to-NIR multi-wavelength catalogue, we measured photometric
redshifts through a chi2 SED-fitting procedure. We implemented a
reliable and carefully chosen cluster…
