Simultaneous Multifrequency Observations of the BL Lac MS 0205.7+3509

Details Simultaneous Multifrequency Observations of the BL Lac MS 0205.7+3509 Simultaneous Multifrequency Observations of the BL Lac MS 0205.7+3509

1999-03-02

arxiv.org/abs/astro-ph/9903044v1

Astron.Astrophys.345:414-418,1999

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, LaTeX2e Accepted for publication in Astronomy and Astrophysics

Scientific paper

Radio and optical observations of the possible microlensed BL Lac source MS 0205.7+3509 were obtained simultaneously with ASCA x-ray measurements in February 1997. A single power law model, with a photon index of 2.61, is an adequate fit to the ASCA data, once hydrogenic absorption in excess of the Galactic value is permitted, confirming a previous ROSAT measurement. On the basis of our simultaneous data we have determined MS 0205.7+3509 to be a typical x--ray selected BL Lac, with alpha_xox=-0.82. There is no indication of an inverse Compton (IC) component in the ASCA spectrum up to 10 keV. No evidence for variability on hour-long timescales is present in either the x-ray or the optical data. We discuss these results in the context of a gravitational microlensing scenario for MS 0205.7+3509.

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