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Integral field spectrophotometry of gravitationally lensed QSOs with PMAS

L. WisotzkiUniversität Potsdam, Am Neuen Palais 10, 14469 Potsdam, GermanyT. BeckerAstrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, GermanyL. ChristensenAstrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, GermanyK. JahnkęAstrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, GermanyA. HelmsUniversität Potsdam, Am Neuen Palais 10, 14469 Potsdam, GermanyAndreas KelzAstrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, GermanyMartin M. RothAstrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, GermanyS. F. SánchezAstrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany

2004en

ABI

Annotatsiya

Abstract 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. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Identifikatorlar

DOI: 10.1002/asna.200310193

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