We present first results from a deep (J = 18.7), wide-field (6.5deg2) infrared (ZY JHK) survey in the Upper Sco association conducted within the science...
-
PublicaciónNew brown dwarfs in Upper Sco using UKIDSS Galactic Cluster Survey science verification data
-
PublicaciónNew Isolated Planetary-mass Objects and the Stellar and Substellar Mass Function of the σ Orionis Cluster
We report on our analysis of the VISTA Orion ZY JHKs photometric data (completeness magnitudes of Z = 22.6 and J = 21.0 mag) focusing on a circular area of 2798...
-
PublicaciónNew very massive stars in Cygnus OB2
Context: The compact association Cygnus OB2 is known to contain a large population of massive stars, but its total mass is currently a matter of debate. While...
-
PublicaciónOn the buildup of massive early-type galaxies at z ⪉ 1. I. Reconciling their hierarchical assembly with mass downsizing
Context. Several studies have tried to ascertain whether the increase in abundance of the early-type galaxies (E-S0a's) with time is mainly due to major mergers...
-
PublicaciónOn the Dearth of Ultra-faint Extremely Metal-poor Galaxies
Local extremely metal-poor galaxies (XMPs) are of particular astrophysical interest since they allow us to look into physical processes characteristic of the...
-
PublicaciónOn the dust properties of the UV galaxies in the redshift range z 0.6-1.2
Far-infrared observations from the Herschel Space Observatory are used to estimate the infrared (IR) properties of ultraviolet-selected galaxies. We stack the...
-
PublicaciónOn the Galactic globular cluster Delta VHBbump parameter .
We calculated new estimates of the Delta VHBbump parameter for 15 Galactic Globular Clusters (GGCs) using accurate ground-based photometric data. We enlarged...
-
PublicaciónOn the importance of the few most massive stars: The ionizing cluster of NGC 588
We present the results of a double analysis of the ionizing cluster in NGC 588, a giant HII region (GHR) in the outskirts of the nearby galaxy M 33. For this...
-
PublicaciónOptical and infrared photometry of new very low-mass stars and brown dwarfs in the sigma Orionis cluster
We present an RI photometric survey covering an area of 430 arcmin2 around the multiple star sigma Orionis. The observations were conducted with the 0.8 m IAC...