Lensing Effects on the Protogalaxy Candidate cB58 and Their Implications for the Cosmological Constant | Zendy

Takashi Hamana | Zendy; M. Hattori | Zendy; H. Ebeling | Zendy; J. P. Henry | Zendy; Toshifumi Futamase | Zendy; Y. Shioya | Zendy

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

Author(s) -

Takashi Hamana,

M. Hattori,

H. Ebeling,

J. P. Henry,

Toshifumi Futamase,

Y. Shioya

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/304378

Subject(s) - protogalaxy , physics , cosmological constant , gravitational lens , astrophysics , rosat , constant (computer programming) , strong gravitational lensing , weak gravitational lensing , gravitational constant , gravitational lensing formalism , cluster (spacecraft) , galaxy , galaxy cluster , gravitation , lambda cdm model , cosmology , mathematical physics , astronomy , type cd galaxy , redshift , computer science , dark energy , programming language

The amplification of the protogalaxy candidate cB58 due to gravitationallensing by the foreground cluster of galaxies MS1512.4+3647 is quantified basedon recent ROSAT and ASCA X-ray observations. It is found that the amplificationis at most 25 for any reasonable cosmological model with or withoutcosmological constant. It is also argued that the system may be used to placenew constraints on the value of the cosmological constant. The gas massfraction for this cluster is found to be about 0.2.Comment: LaTex, 9 pages, 9 figures, uses aas2pp4.sty, Accepted for publication in Ap

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