The Lensing Galaxy in MG1549+3047

Details The Lensing Galaxy in MG1549+3047 The Lensing Galaxy in MG1549+3047

1996-01-30

arxiv.org/abs/astro-ph/9601181v1

Astronomy and Astrophysics

Astrophysics

11 pages, 6 PostScript figures, uses AAS LaTex style aaspp.sty, To appear in AJ (1996.05), Submitted 1995.09.22, Accepted 1996

Scientific paper

10.1086/117919

We have measured a velocity dispersion for the foreground galaxy in this gravitationally lensed system. Our dispersion confirms the prediction from lens models, provided that the source is distant enough ($z_{_S}>0.2$). Current interpretations of lensing statistics depend sensitively on how the optical and mass dispersions are related. For $z_{_S}>0.5$, our observations favor $\sigma_{mass}/\sigma_{opt}\simeq1$, but our uncertainties prevent us from clearly distinguishing between dynamical models. We could not obtain a unique mass profile from lensing constraints, but models with a constant mass-to-light ratio are possible. We also found unusual rotation in the lensing galaxy, and confirmed its redshift.

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