Inversions of spectropolarimetric observations of penumbral filaments deliver the stratification of different physical quantities in an optical depth scale. However, without establishing a geometrical height scale, their three-dimensional geometrical structure cannot be derived. This is crucial in understanding the correct spatial variation of

We present first insights into the far-IR properties for a sample of IRAC and MIPS 24 μm detected Lyman break galaxies (LBGs) at z ~ 3, as derived from observations in the northern field of the Great Observatories Origins Survey (GOODS-N) carried out with the PACS instrument on board the Herschel Space Observatory. Although none of our galaxies are

Substellar objects (mass M < 0.075 Msol) have core temperatures too low to produce stable hydrogen fusion. Therefore, they progressively contract and cool down. Hundreds of brown dwarfs (M=0.013-0.075 Msol) and fewer hundreds of planetary-mass objects (M<0.013 M) or candidates have been discovered in the last fifteen years. Brown dwarfs have been

La formación y evolución de galaxias dependen fuertemente de la metalicidad y la tasa de formación estelar (SFR), por lo que el vínculo entre estos dos parámetros a diferentes desplazamientos al rojo (z) afectará sustancialmente la evolución de las galaxias. Paradójicamente, en la literatura abundan los estudios de evolución a z altos, mientras que

We observed the black hole candidate XTE J1752-223 (ATel #2258) with the William Herschel Telescope (WHT) and the ACAM imager/spectrograph at the Observatorio del Roque de los Muchachos, La Palma, Spain. 200-s exposures were taken in the R and I bands under photometric conditions and 0.6-0.7-arcsec seeing on Aug 24.887 and Aug 24.893, respectively

We have been regularly monitoring the outburst decay of the black hole candidate X-ray binary XTE J1752-223 (discovered by RXTE; ATel #2258) with the 2-m Faulkes Telescopes North and South (located at Haleakala on Maui and Siding Spring, Australia, respectively). Exposures in B, V, R and i'-bands (mostly 100-sec exposures each) were taken every ~ 3