The HST/ACS Survey of Galactic globular clusters (GGCs) is a HST Treasury project aimed at obtaining high precision photometry in a large sample of globular clusters. The homogeneous photometric catalogs that has been obtained from these data by Anderson et al. (2008) represents a golden mine for a lot of astrophysical studies. In this paper we

We present optical- near infrared photometry of the peculiar Galactic globular cluster NGC 6441. By using the K-band Period-Luminosity-Metallicity (PLZK) of its RR Lyrae stars, we supply a new estimate of its distance. With this distance, we discuss the comparison in the K-(J-K) plane between observations and "canonical" evolutionary models.

We present deep and accurate photometry (F435W, F625W, F658N) of the Galactic Globular Cluster omega Cen collected with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST). We identified ≈ 6,500 white dwarf (WD) candidates and compared their radial distribution with that of Main Sequence (MS) stars. We found a mild

Since 2005 the giant radio galaxy M87 has been observed in the 100 GeV energy domain with the MAGIC Telescope. Results from the analysis of those observations will be presented.

The MAGIC Telescope is the only IACT suited for the observation of GRBs. Thanks to its fast repositioning time and low energy threshold, MAGIC has been able to perform observations of the prompt and early afterglow emission of several GRBs. Since the beginning of operations of Swift the GRB scenario has changed, both for what concerns the

Starbursts and AGNs are frequently coupled in the central kiloparsecs of seyfert galaxies, where molecular gas plays a critical role in fueling nuclear starburst activity and feeding the central black hole. Unveiling the dusty nuclear regions with high-resolution techniques in the nearinfrared permit us to distinguish between the AGN and the Super