Integral field spectrophotometry of gravitationally lensed QSOs with PMAS

Details Integral field spectrophotometry of gravitationally lensed QSOs with PMAS Integral field spectrophotometry of gravitationally lensed QSOs with PMAS

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004an....325..135w&link_type=abstract

Astronomische Nachrichten, Vol.325, Issue 2, p.135-138

Astronomy and Astrophysics

Astronomy

6

Quasars: Individual (He 0435-1223, Um 673), Quasars: General, Gravitational Lensing

Scientific paper

We present spatially resolved spectrophotometric observations of multiply imaged QSOs, using the Potsdam Multi-Aperture Spectrophotometer (PMAS), with the intention to search for spectral differences between components indicative of either microlensing or dust extinction. For the quadruple QSO HE 0435-1223 we find that the continuum shapes are indistinguishable, therefore differential extinction is negligible. The equivalent widths of the broad emission lines are however significantly different, and we argue that this is most likely due to microlensing. Contrariwise, the two components of the well-known object UM 673 have virtually identical emission line properties, but the continuum slopes differ significantly and indicate different dust extinction along both lines of sight.

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