The design of slitmasks for multi-object spectroscopy with OSIRIS at the GTC telescope is now possible with the OSIRIS Mask Designer tool, a Java plug-in to the well-known JSky application. Observers can use external reduced images to design new MOS masks for future observations with OSIRIS and, once the instrument is up and running, will be able

Aims.We imaged the Lynds 723 dark nebula (L723) with the aim of studying the morphology of the Herbig-Haro object HH 223 and other line-emission nebula detected in the region. Methods: .We obtained deep narrow-band images in the Hα and [SII] lines and in the continuum nearby Hα of a field of ˜ 5' of the L723 dark nebula centered on HH 223. Results

We present the analysis of the first 18 months of data obtained with the COSMOSOMAS (COSMOlogical Structures On Medium Angular Scales) experiment at the Teide Observatory (Tenerife). Three maps have been obtained at 12.7, 14.7 and 16.3GHz covering 9000deg2 each with a resolution of ~1° and with sensitivities 49, 59 and 115μKbeam-1, respectively

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We present a multiwavelength analysis of the young open cluster NGC 2362; UBVRCIC CCD photometric observations, together with available data in the Chandra database, near-infrared data from the Two Micron All Sky Survey (2MASS), and recently published Hα spectroscopy were used to get information about the evolutionary stage of the cluster and the

We explore whether stellar tidal streams can provide information on the secular, cosmological evolution of the Milky Way's gravitational potential and on the presence of subhalos. We carry out long-term (Δt~tHubble) N-body simulations of disrupting satellite galaxies in a semianalytic Galaxy potential in which the dark matter halo and the subhalos