Lensing Effects on the Protogalaxy Candidate cB58 and their Implications for the Cosmological Constant

(2) Institute for Astronomy; H. Ebeling (2); J. P. Henry (2); M. Hattori (1); T. Futamase (1); T. Hamana (1); Tohoku University; University of Hawaii); Y. Shioya (1) ((1) Astronomical Institute

arxiv: astro-ph/9703136 · v1 · submitted 1997-03-21 · 🌌 astro-ph

Lensing Effects on the Protogalaxy Candidate cB58 and their Implications for the Cosmological Constant

T. Hamana (1) , M. Hattori (1) , H. Ebeling (2) , J. P. Henry (2) , T. Futamase (1) , Y. Shioya (1) ((1) Astronomical Institute , Tohoku University , (2) Institute for Astronomy

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University of Hawaii)

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keywords cosmologicalconstantamplificationcandidatecb58clusterfoundlensing

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The amplification of the protogalaxy candidate cB58 due to gravitational lensing by the foreground cluster of galaxies MS1512.4+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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Lensing Effects on the Protogalaxy Candidate cB58 and their Implications for the Cosmological Constant

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