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ID: 12154.0, MPI für Astrophysik / Cosmology
Lensing by Lyman-limit systems: Determining the mass-to-gas ratio
Authors:Maller, A. H.; Kolatt, T. S.; Bartelmann, M.; Blumenthal, G. R.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:The Astrophysical Journal
Journal Abbrev.:Astrophys. J.
Volume:569
Issue / Number:1
Start Page:72
End Page:82
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a new method for determining the total mass-to- neutral gas ratio Y (H) (I) in Lyman-limit absorption systems. The method exploits the relation between the neutral hydrogen column density and the magnification of background sources due to weak gravitational lensing by these systems. Since weak lensing does not measure the mass directly, this relation must be inverted in a statistical sense to solve for the average (sic)(H) (I) and its distribution. We demonstrate the feasibility of this approach by using a detailed mock catalog of quasars (sources) and Lyman-limit systems ( lenses) and by showing our ability to recover the parameter (sic)(H) (I). This mock catalog also allows us to check for systematics in the method and to sketch its limitations. For a universal constant (sic)(H) (I) and a sample of n(QSO) quasars, we obtain an unbiased estimate of (sic)(H) (I) with 95% confidence levels of +/-140 (10(5)/n(QSO))(1/2), where the error bars are independent of (sic)(H) (I).
Free Keywords:dark matter; galaxies : formation; gravitational lensing; quasars : absorption lines
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik/Gravitational Lensing
External Affiliations:Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem,; Israel; Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel; Max Planck Inst Astrophys, D-84741 Garching, Germany; Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
Identifiers:ISI:000174876800008
ISSN:0004-637X
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