72 research outputs found
PrevalĂȘncia das alteraçÔes sĂ©ricas das enzimas hepĂĄticas e das bilirrubinas em alcoolistas hospitalizados no CDQUIM/RS
Star formation histories in mergers: the spatially resolved properties of the early-stage merger luminous infrared galaxies IC 1623 and NGC 6090
The role of major mergers in galaxy evolution is investigated through a detailed characterization of the stellar populations, ionized gas properties and star formation rates (SFR) in the early-stage merger luminous infrared galaxies (LIRGs) IC 1623 W and NGC 6090, by analysing optical integral field spectroscopy and high-resolution Hubble Space Telescope imaging. The spectra were processed with the starlight full spectral fitting code, and the emission lines measured in the residual spectra. The results are compared with non-interacting control spiral galaxies from the Calar Alto Legacy Integral Field Area survey. Merger-induced star formation is extended and recent, as revealed by the young ages (50â80 Myr) and high contributions to light of young stellar populations (50â90âperâcent), in agreement with merger simulations in the literature. These early-stage mergers have positive central gradients of the stellar metallicity, with an average âŒ0.6 Zâ. Compared to non-interacting spirals, they have lower central nebular metallicity, and flatter profiles, in agreement with the gas inflow scenario. We find that they are dominated by star formation, although shock excitation cannot be discarded in some regions, where high velocity dispersion is found (170â200âkmâsâ1). The average SFR in these early-stage mergers (âŒ23â32 Mâ yrâ1) is enhanced with respect to main-sequence Sbc galaxies by factors of 6â9, slightly above the predictions from classical merger simulations, but still possible in about 15âperâcent of major galaxy mergers, where U/LIRGs belong
Sphecidae (Hymenoptera: Apoidea) of Rio de Janeiro State (Southeast Brazil): new geographic records and remarks on faunal distribution
AnĂĄlise florĂstica, estrutural e fitogeogrĂĄfica da vegetação em regiĂŁo de transição entre as Florestas OmbrĂłfilas Mista e Densa Montana, Piraquara, ParanĂĄ, Brasil
Determinação de eletrĂłlitos, gases sanguĂneos, osmolalidade, hematĂłcrito, hemoglobina, base titulĂĄvel e anion gap no sangue venoso de equinos destreinados submetidos a exercĂcio mĂĄximo e submĂĄximo em esteira rolante
Gill metazoan parasites of the spotted goatfish Pseudupeneus maculatus (Ostheichthyes: Mullidae) from the Coast of Pernambuco, northeastern Brazil
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