We investigate the luminous X-ray sources in the Lockman Hole (LH) and the extended Groth strip (EGS) detected at 24 μm using the Multiband Imaging Photometer (MIPS) and also with the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope. We assemble optical/infrared spectral energy distributions (SEDs) for 45 X-ray/24 μm sources in the
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Además ofrece acceso al repositorio de preprints del IAC: https://research.iac.es/preprints/l
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The Nature of Luminous X-Ray Sources with Mid-Infrared CounterpartsAlonso-Herrero, A. et al.92004
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The Nature of Starbursts. I. The Star Formation Histories of Eighteen Nearby Starburst Dwarf Galaxies
We use archival Hubble Space Telescope observations of resolved stellar populations to derive the star formation histories (SFHs) of 18 nearby starburst dwarf galaxies. In this first paper, we present the observations, color-magnitude diagrams (CMDs), and the SFHs of the 18 starburst galaxies, based on a homogeneous approach to the data reduction
McQuinn, Kristen B. W. et al.Fecha de publicación:
92010 -
The Nature of the Far-Infrared Emission from Seyfert Galaxies
Optical R-band imaging data and far-infrared (FIR) Infrared Space Observatory data from Seyfert galaxies are combined to show that the compact optical emission from the nuclear and circumnuclear region correlates reasonably well with the warm FIR emission that is observed in these objects, while the extended optical emission, which essentially
Rodríguez-Espinosa, J. M. et al.Fecha de publicación:
91997 -
The near-infrared Ca II triplet as a metallicity indicator - II. Extension to extremely metal-poor metallicity regimes
We extend our previous calibration of the infrared Ca II triplet (CaT) as a metallicity indicator to the metal-poor regime by including observations of 55 field stars with [Fe/H] down to -4.0 dex. While we previously solved the saturation at high metallicity using a combination of a Lorentzian and a Gaussian to reproduce the line profiles, in this
Carrera, R. et al.Fecha de publicación:
92013 -
The near-infrared-optical-ultraviolet emission of BL Lacertae objects
Near-infrared, optical, and ultraviolet quasi-simultaneous observations of 11 BL Lacertae objects are reported. For all but one source the dereddened spectral flux distribution in the (8 x 10 13)-(2 x 1015) Hz frequency range can be described by a single power law fv proportional to v-alpha with average spectral index (mean value of alpha) = 0.88 +
Pian, E. et al.Fecha de publicación:
91994 -
The new site testing survey in the Canary Islands' observatories
The future establishment of large telescopes at the Observatorio del Roque de los Muchachos (ORM) has raised the necessity of designing a site-testing campaign, aimed specifically at selecting their emplacements, as well as characterizing correctly the local seeing behavior and the fluctuations of the turbulent field in the area covered by the
Fuentes, F. J. et al.Fecha de publicación:
91990