Lensing effects on the protogalaxy candidate cB58 and their implications for the cosmological constant

T. Hamana; M. Hattori; H. Ebeling; J. P. Henry; T. Futamase; Y. Shioya

doi:10.1086/304378

Lensing effects on the protogalaxy candidate cB58 and their implications for the cosmological constant

T. Hamana, M. Hattori, H. Ebeling, J. P. Henry, T. Futamase, Y. Shioya

SCI - Astronomy

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

The amplification of the protogalaxy candidate cB58 due to gravitational lensing by the foreground cluster of galaxies MS 1512.4 + 3647 is quantified based on recent ROSAT and ASCA X-ray observations. It is found that the amplification is at most 25 for any reasonable cosmological model with or without cosmological constant. It is also argued that the system may be used to place new constraints on the value of the cosmological constant. The gas mass fraction for this cluster is found to be about 0.2.

Original language	English
Pages (from-to)	574-580
Number of pages	7
Journal	Astrophysical Journal
Volume	484
Issue number	2
DOIs	https://doi.org/10.1086/304378
Publication status	Published - 1997

Keywords

Distance scale
Gravitational lensing
X-rays: galaxies

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title = "Lensing effects on the protogalaxy candidate cB58 and their implications for the cosmological constant",

abstract = "The amplification of the protogalaxy candidate cB58 due to gravitational lensing by the foreground cluster of galaxies MS 1512.4 + 3647 is quantified based on recent ROSAT and ASCA X-ray observations. It is found that the amplification is at most 25 for any reasonable cosmological model with or without cosmological constant. It is also argued that the system may be used to place new constraints on the value of the cosmological constant. The gas mass fraction for this cluster is found to be about 0.2.",

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author = "T. Hamana and M. Hattori and H. Ebeling and Henry, {J. P.} and T. Futamase and Y. Shioya",

year = "1997",

doi = "10.1086/304378",

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T1 - Lensing effects on the protogalaxy candidate cB58 and their implications for the cosmological constant

AU - Hamana, T.

AU - Hattori, M.

AU - Ebeling, H.

AU - Henry, J. P.

AU - Futamase, T.

AU - Shioya, Y.

PY - 1997

Y1 - 1997

N2 - The amplification of the protogalaxy candidate cB58 due to gravitational lensing by the foreground cluster of galaxies MS 1512.4 + 3647 is quantified based on recent ROSAT and ASCA X-ray observations. It is found that the amplification is at most 25 for any reasonable cosmological model with or without cosmological constant. It is also argued that the system may be used to place new constraints on the value of the cosmological constant. The gas mass fraction for this cluster is found to be about 0.2.

AB - The amplification of the protogalaxy candidate cB58 due to gravitational lensing by the foreground cluster of galaxies MS 1512.4 + 3647 is quantified based on recent ROSAT and ASCA X-ray observations. It is found that the amplification is at most 25 for any reasonable cosmological model with or without cosmological constant. It is also argued that the system may be used to place new constraints on the value of the cosmological constant. The gas mass fraction for this cluster is found to be about 0.2.

KW - Distance scale

KW - Gravitational lensing

KW - X-rays: galaxies

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SP - 574

EP - 580

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

Lensing effects on the protogalaxy candidate cB58 and their implications for the cosmological constant

Abstract

Keywords

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