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most citedThe XMM-Newton Serendipitous Survey V. Optical identification of the XMM-Newton Medium sensitivity Survey (XMS)

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astro-ph2005★ 15 cited

The dark halo of the main lens galaxy in QSO 0957+561

Luis J. Goicoechea, Rodrigo Gil-Merino, Aurora Ullan

We present an analysis of infrared/optical/ultraviolet spectra of the two images of the first gravitationally lensed quasar Q0957+561A, B. The Hubble Space Telescope observations o…