We exploit deep combined observations with Spitzer and Chandra of the Spitzer Wide-Area Infrared Extragalactic Survey (SWIRE) in the ELAIS N1 region to investigate the nature of the faint X-ray and IR sources in common, to identify active galactic nucleus (AGN)/starburst diagnostics, and to study the sources of the X-ray and IR cosmic backgrounds

In order to characterize the low surface brightness component in blue compact dwarf galaxies, we determine their structural parameters for eight objects by fitting a Sérsic law to their B, V, and R light profiles. We restrict the fit to the outer regions, excluding the starburst emission with the help of color and Hα maps. We discuss the problems

The vertical distribution of K giants stars is analyzed using 2MASS data and a semiempirical method of extracting stellar densities from the K/J-K colour-magnitude diagrams. The vertical density distribution of red clump giant stars can be described by a double exponential, with scaleheights of 268.81 ± 12.65 pc and 1061.9 ± 52.16 pc. These values

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We present spectroscopic observations of six optical counterparts of ultraluminous X-ray sources (ULXs) around nearby galaxies. The spectra of the six objects show the presence of broad emission features. The identification of these allow us to classify all of the objects as quasars at higher redshift than their assigned parent galaxy. This is one

We present the multiwavelength properties and catalogue of the 15μm and 1.4GHz radio sources detected in the European Large Area ISO Survey (ELAIS) areas N1 and N2. Using the optical data from the Wide Field Survey we use a likelihood ratio method to search for the counterparts of the 1056 and 691 sources detected at 15μm and 1.4GHz, respectively