Probing Yukawian gravitational potential by numerical simulations. II. Elliptical galaxies
نویسندگان
چکیده
منابع مشابه
Gravitational lensing by elliptical galaxies
The fraction of high-redshift sources which are multiply-imaged by intervening galaxies is strongly dependent on the cosmological constant, and so can be a useful probe of the cosmological model. However its power is limited by various systematic (and random) uncertainties in the calculation of lensing probabilities, one of the most important of which is the dynamical normalisation of elliptica...
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The probability that high-redshift quasars are gravitationally-lensed by intervening galaxies increases rapidly with the cosmological constant, ΩΛ0 (whilst being only weakly dependent on the density parameter, Ωm0), and the low number of lenses observed implies that ΩΛ0 ∼< 0.7 (e.g. Kochanek 1996). One of many uncertainties has been the (small) core radii of elliptical galaxies, which, at least...
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In this paper we address the question whether age and metallicity effects can be disentangled with the aid of the broad-band colours and spectral indices from absorption feature strengths, so that the age of elliptical galaxies can be inferred. The observational data under examination are the indices Hβ and [MgFe], and the velocity dispersion Σ for the sample of galaxies of Gonzales (1993), sup...
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ژورنال
عنوان ژورنال: General Relativity and Gravitation
سال: 2009
ISSN: 0001-7701,1572-9532
DOI: 10.1007/s10714-009-0875-x