Simultaneous Multifrequency Observations of the BL Lac MS 0205.7+3509
D. Watson, L. Hanlon, B. McBreen, N. Smith, M. Tashiro, A. R. Foley, L. Metcalfe, V. Beckmann, S. F. Sanchez, H. Teraesranta
Abstract
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 alphaxox=-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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