Sinhue Haro Corzo

Publications (5)6.02 Total impact

• Article: Nanodiamond Dust and the Far-Ultraviolet Quasar Break

  Luc Binette, Gladis Magris C, Yair Krongold, Christophe Morisset, Sinhue Haro-Corzo, Jose Antonio de Diego, Harald Mutschke, and Anja C. Andersen
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  ABSTRACT: We explore the possibility that the steepening observed shortward of 1000 Å in the energy distribution of quasars may result from absorption by dust, being either intrinsic to the quasar environment or intergalactic. We find that a dust extinction curve consisting of nanodiamonds, composed of terrestrial cubic diamonds or with surface impurities as found in carbonaceous chondrite meteorites, such as Allende, is successful in reproducing the sharp break observed. The intergalactic dust model is partially successful in explaining the shape of the composite energy distribution but must be discarded in the end, as the amount of crystalline dust required is unreasonable and would imply an improbable fine-tuning among the dust formation processes. The alternative intrinsic dust model requires a mixture of both cubic diamonds and Allende nanodiamonds and provides a better fit of the UV break. The gas column densities implied are of the order 1020 cm-2, assuming solar metallicity for carbon and full depletion of carbon into dust. The absorption only occurs in the ultraviolet and is totally negligible in the visible. The minimum dust mass required is of the order ~0.003r M☉, where rpc is the distance in parsecs between the dust screen and the continuum source. The intrinsic dust model reproduces the flux rise observed around 660 Å in key quasar spectra quite well. We present indirect evidence of a shallow continuum break near 670 Å (18.5 eV), which would be intrinsic to the quasar continuum.
  The Astrophysical Journal 12/2008; 631(2):661. · 6.02 Impact Factor
• Source

  Available from: unam.mx

  Article: The Nature of the Far-UV Break in the Energy Distribution of Quasars

  Anja C. Andersen, Binette Luc, Sinhue Haro Corzo, Krongold Yair
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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;
• Source

  Available from: arxiv.org

  Article: Dust and the ultraviolet energy distribution of quasars

  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;
• Source

  Available from: Luc Binette

  Article: Technique for detecting warm-hot intergalactic gas in quasar UV spectra

  Luc Binette, Mario Rodriguez-Martinez, Sinhue Haro Corzo, Isidro Ballinas
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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
  01/2003;
• Article: Whim Absorption And UV Quasar Spectra

  Luc Binette, Sinhue Haro Corzo, Mario Rodríguez Martínez
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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;