期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 337, 期 2, 页码 L6-L10出版社
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-8711.2002.06107.x
关键词
gravitational lensing; galaxies : elliptical and lenticular, cD; galaxies : fundamental parameters; galaxies : kinematics and dynamics; distance scale
We combine lensing, stellar kinematic and mass-to-light ratio constraints to build a two-component (luminous plus dark) mass model of the early-type lens galaxy in PG1115+080. We find a total mass density profile steeper than r(-2), effectively rho proportional to r(-gamma)' with gamma' = 2.35 +/- 0.1 +/- 0.05 (random + systematic). The stellar mass fraction is f(*) = 0.67(-0.25)0.20 +/- 0.03 inside the Einstein radius (R-E approximate to 1.2 effective radii). The dynamical mass model breaks the degeneracies in the mass profile of the lens galaxy and allows us to obtain a value of the Hubble constant that is no longer dominated by systematic errors: H-0 = 59(-7)(+12) +/- 3 km s(-1) Mpc(-1) (68 per cent confidence level; Omega(m) = 0.3, Omega(Lambda) = 0.7). The offset of PG1115+080 from the Fundamental Plane might indicate deviations from homology of the mass profile of some early-type galaxies.
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