9 research outputs found

    Substructures in lens galaxies: PG1115+080 and B1555+375, two fold configurations

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    We study the anomalous flux ratio which is observed in some four-image lens systems, where the source lies close to a fold caustic. In this case two of the images are close to the critical curve and their flux ratio should be equal to unity, instead in several cases the observed value differs significantly. The most plausible solution is to invoke the presence of substructures, as for instance predicted by the Cold Dark Matter scenario, located near the two images. In particular, we analyze the two fold lens systems PG1115+080 and B1555+375, for which there are not yet satisfactory models which explain the observed anomalous flux ratios. We add to a smooth lens model, which reproduces well the positions of the images but not the anomalous fluxes, one or two substructures described as singular isothermal spheres. For PG1115+080 we consider a smooth model with the influence of the group of galaxies described by a SIS and a substructure with mass 105M\sim 10^{5} M_{\odot} as well as a smooth model with an external shear and one substructure with mass 108M\sim 10^{8} M_{\odot} . For B1555+375 either a strong external shear or two substructures with mass 107M\sim 10^{7} M_{\odot} reproduce the data quite well.Comment: 26 pages, updated bibliography, Accepted for publication in Astrophysics & Space Scienc

    Selective Estrogen Modulators as an Anticancer Tool:

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    Cognitive Aspects: How People Perceive, Memorize, Think and Talk About Landmarks

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    The Endeavours in RAS Inhibition - the Past, Present, and Future

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    On the dark matter haloes inner structure and galaxy morphology

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