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104 papers · 1 filter
NIR Spectroscopy of Luminous Infrared Galaxies and the Hydrogen Recombination Photon Deficit
J. R. Valdes, S. Berta, A. Bressan +3
We report on near-infrared medium-resolution spectroscopy of a sample of luminous and ultra luminous infrared galaxies (LIRGs-ULIRGs), carried out with SOFI at the ESO 3.5m New Tec…
Small-scale systems of galaxies. II. Properties of the NGC 4756 group of galaxies
R. Gruetzbauch, B. Kelm, P. Focardi +3
We present results from a study of the NGC 4756 group which is dominated by the elliptical galaxy NGC 5746. The characteristics of the group are investigated through (a) the detail…
Complete Multiwavelength Characterization of Faint Chandra X-ray Sources Seen in the Spitzer Wide-Area IR Extragalactic (SWIRE) Survey
A. Franceschini, J. Manners, M. Polletta +24
We exploit deep combined observations with Spitzer and Chandra of the SWIRE survey in the ELAIS-N1 region, to investigate the nature of the faint X-ray and IR sources in common, to…
Observational evidence for a different IMF in the early Galaxy
Sara Lucatello, Raffaele G. Gratton, Timothy C. Beers +1
The unexpected high incidence of carbon-enhanced, s-process enriched unevolved stars amongst extremely metal-poor stars in the halo provides a significant constraint on the Initial…
The Binary Frequency Among Carbon-Enhanced, s-Process Rich, Metal-Poor Stars
Sara Lucatello, Stelios Tsangarides, Timothy C. Beers +3
We discuss radial velocities for a sample of carbon-enhanced, s-process rich, very metal-poor stars (CEMP-s hereafter), analyzed with high-resolution spectroscopy obtained over mul…
VLT adaptive optics imaging of QSO host galaxies and close environment at z ~2.5: results from a pilot program
R. Falomo, J. K. Kotilainen, R. Scarpa +1
We report ESO-VLT near-infrared adaptive optics imaging of one radio-loud (PKS 0113-283) and two radio-quiet (Q 0045-3337 and Q 0101-337) QSOs at z > 2. In the first case, we are a…