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The X-Shooter Lens Survey - I. Dark matter domination and a Salpeter-type initial mass function in a massive early-type galaxy

Spiniello, C. ; Koopmans, L. V. E. ; Trager, S. C. ; Czoske, O. ; Treu, T.

Monthly notices of the Royal Astronomical Society, 2011-11, Vol.417 (4), p.3000-3009 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

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  • Título:
    The X-Shooter Lens Survey - I. Dark matter domination and a Salpeter-type initial mass function in a massive early-type galaxy
  • Autor: Spiniello, C. ; Koopmans, L. V. E. ; Trager, S. C. ; Czoske, O. ; Treu, T.
  • Assuntos: Astronomy ; Dark matter ; Earth, ocean, space ; Exact sciences and technology ; galaxies: elliptical and lenticular ; galaxies: elliptical and lenticular, cD ; galaxies: formation ; galaxies: kinematics and dynamics ; galaxies: structure ; gravitational lensing: strong ; Stars & galaxies
  • É parte de: Monthly notices of the Royal Astronomical Society, 2011-11, Vol.417 (4), p.3000-3009
  • Notas: ark:/67375/WNG-HP9HXZ4R-8
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  • Descrição: We present the first results from the X-Shooter Lens Survey: an analysis of the massive early-type galaxy SDSS J1148+1930 at redshift z= 0.444. We combine its extended kinematic profile - derived from spectra obtained with X-Shooter on the European Southern Observatory Very Large Telescope - with strong gravitational lensing and multicolour information derived from Sloan Digital Sky Survey (SDSS) images. Our main results are as follows. (i) The luminosity-weighted stellar velocity dispersion is 〈σ*〉(≲R eff) = 352 ± 10 ± 16 km s−1, extracted from a rectangular aperture of 1.8 × 1.6 arcsec2 centred on the galaxy, more accurate and considerably lower than a previously published value of ∼450 km s−1. (ii) A single-component (stellar plus dark) mass model of the lens galaxy yields a logarithmic total-density slope of γ′= 1.72+0.05 − 0.06 (68 per cent confidence level, CL; ) within a projected radius of ∼2.16 arcsec. (iii) The projected stellar mass fraction, derived solely from the lensing and dynamical data, is f *(90 per cent CL and in some cases violate the total lensing-derived mass limit. We conclude that this very massive early-type galaxy is dark-matter-dominated inside one effective radius, consistent with the trend recently found from massive Sloan Lens ACS (SLACS) galaxies, with a total density slope shallower than isothermal and an IMF normalization consistent with Salpeter.
  • Editor: Oxford, UK: Blackwell Publishing Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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