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Abstract:

We analyze the effects of large-scale inhomogeneities upon the observables of a gravitational lens system, focusing on the issue of whether large-scale structure imperils the program to determine the Hubble parameter through measurements of time delays between multiple images in lens systems. We find that the lens equation in a spatially flat Robertson-Walker cosmology with scalar metric fluctuations is equivalent, to the leading order of approximation, to that for the same lensing system in the absence of fluctuations but with a different angular position of the source relative to the lens axis. Since the absolute position of the source is not observable, gravitational lens measurements cannot directly reveal the presence of large-scale structure. Large-scale perturbations do not modify the functional relationship between observable lens parameters and the Hubble parameter and therefore do not seriously affect the determination of Ho from lens time delays. © 1996. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:Large-scale structure and the determination of Ho from gravitational lens time delays
Autor:Surpi, G.C.; Harari, D.D.; Frieman, J.A.
Filiación:Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pab. l, 1428 Buenos Aires, Argentina
NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, IL 60510-0500, United States
Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, United States
Palabras clave:Cosmology: Theory; Distance scale; Gravitational lensing; Large-scale structure of universe
Año:1996
Volumen:464
Número:1 PART I
Página de inicio:54
Página de fin:59
DOI: http://dx.doi.org/10.1086/177299
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v464_n1PARTI_p54_Surpi

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Citas:

---------- APA ----------
Surpi, G.C., Harari, D.D. & Frieman, J.A. (1996) . Large-scale structure and the determination of Ho from gravitational lens time delays. Astrophysical Journal, 464(1 PART I), 54-59.
http://dx.doi.org/10.1086/177299
---------- CHICAGO ----------
Surpi, G.C., Harari, D.D., Frieman, J.A. "Large-scale structure and the determination of Ho from gravitational lens time delays" . Astrophysical Journal 464, no. 1 PART I (1996) : 54-59.
http://dx.doi.org/10.1086/177299
---------- MLA ----------
Surpi, G.C., Harari, D.D., Frieman, J.A. "Large-scale structure and the determination of Ho from gravitational lens time delays" . Astrophysical Journal, vol. 464, no. 1 PART I, 1996, pp. 54-59.
http://dx.doi.org/10.1086/177299
---------- VANCOUVER ----------
Surpi, G.C., Harari, D.D., Frieman, J.A. Large-scale structure and the determination of Ho from gravitational lens time delays. Astrophys. J. 1996;464(1 PART I):54-59.
http://dx.doi.org/10.1086/177299