Sinhue Haro Corzo

Universidad Nacional Autónoma de México, Ciudad de México, The Federal District, Mexico

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Publications (6)7.24 Total impact

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    Sinhué Amos Refugio Haro Corzo, Luc Binette
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    ABSTRACT: In this investigation, we present extintion curves calculated on the basis of Mie theory for spherical dust grains with distribution acording to their size (radius between 50 and 2500 Å) and with diverse chemical components found in meteors. According with our paradigm, extinction curves with adequate amounts of atoms, when applied to the theoretical ionizing continuum, must reproduce the observed spectra. We found a successful way to reproduce, for 11 observed spectra, the ultraviolet break and the softness problem, which are present in the ionizing continuum spectra of active galactic nuclei. En esta investigación, presentamos las diversas curvas de extinción que hemos calculado con base en la teoría Mie para granos de polvo esféricos, con distribuciones de acuerdo a su tamaño (entre 50 y 2500 Å de radio) y con diversos compuestos químicos hallados en meteoritos. De acuerdo con el paradigma que hemos desarrollado, las curvas de extinción con cantidades adecuadas de átomos, al ser aplicadas a un continuo ionizante teórico, deberían de reproducir los espectros observados. De esta forma encontramos una manera exitosa de reproducir, para 11 espectros, tanto el quiebre ultravioleta como el problema de suavidad presentes en el continuo ionizante de algunos núcleos activos de galaxias.
    Revista mexicana de ciencias geológicas 03/2008; · 0.51 Impact Factor
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    Binette Luc, Sinhué A. R. Haro Corzo, Krongold Yair
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    ABSTRACT: For a sample of 11 quasars, we find that the soft X-ray excess component is not prolongation of the Big Blue Bump. Furthermore, adopting a theoretical continuum that is absorbed by the appropriate amount of intrinsic dust, we are able to reconcile a universal theoretical continuum with the observed UV break in each quasar and the softness problem.
    Revista Mexicana de Astronomía y Astrofísica : Universidad Nacional Autónoma de México. Instituto de Astronomía. 01/2008;
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    ABSTRACT: A prominent continuum steepening is observed in quasar energy distributions near 1100Å. We review possible interpretations for the physical origin of this so-called far-UV break.
    Revista Mexicana de Astronomía y Astrofísica : Universidad Nacional Autónoma de México. Instituto de Astronomía. 01/2008;
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    Luc Binette, Christophe Morisset, Sinhue Haro Corzo
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    ABSTRACT: The ultraviolet energy distribution of quasars shows a sharp steepening of the continuum shortward of 1000 A (rest-frame). We describe how we came to consider the possibility that this continuum break might be the result of absorption by carbon crystallite dust grains.
    10/2005;
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    ABSTRACT: The ionizing spectral energy distribution of quasars exhibits a steepening of the distribution shortward of ~ 1200 A. The change of the power-law index from approximately -1 (near-UV) to -2 (far-UV) has so far been interpreted as being intrinsic to quasars. We consider the possibility that the steepening may result from a tenuous absorption component that is anticorrelated with large mass overdensities. UV sensitive satellites, whose detectors can extend down to 1000 A, can set a useful limit to such an absorption component through the search of a flux increase in the window 1050-1190 A (observer frame) with respect to an extrapolation of the continuum above 1230 A. Since the recent FUSE or HST-STIS data do not show any obvious discontinuity in this region, this effectively rules out the possibility that intergalactic HI absorption is very important, and it is concluded that most if not all of the steepening is intrinsic to quasars. A smaller flux discontinuity of order 1% cannot, however, be ruled out yet and would still be consistent with the warm-hot intergalactic component if it amounts to 30% of the baryonic mass, as predicted by some models of large scale structure formation, provided its temperature lies around 10^{5.5} K. Comment: 13 pages, 5 figures and 1 table, accepted for publication in Astrophysical Journal, typos corrected and correction for the faulty scaling of variable n_H^0 with redshift
    The Astrophysical Journal 01/2003; · 6.73 Impact Factor
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    ABSTRACT: The ionizing spectral energy distribution of quasars is known to exhibit a steepening in their energy distribution short-ward of 1200 Å. We study the possibility that a tenuous intergalactic absorption gas component, which we associate to the warm-hot intergalactig medium component, may contribute to all or only small part of this steepening. We find that most of the steepening is intrinsic to quasars but that the warm-hot intergalactig medium may produce a very small ux discontinuity near 1216 Å in the observer-frame.
    Revista Mexicana de Astronomía y Astrofísica. 01/2002;