Simultaneous Multifrequency Observations of the BL Lac MS 0205.7+3509
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 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.
Cite
@article{arxiv.astro-ph/9903044,
title = {Simultaneous Multifrequency Observations of the BL Lac MS 0205.7+3509},
author = {D. Watson and L. Hanlon and B. McBreen and N. Smith and M. Tashiro and A. R. Foley and L. Metcalfe and V. Beckmann and S. F. Sanchez and H. Teraesranta},
journal= {arXiv preprint arXiv:astro-ph/9903044},
year = {2011}
}
Comments
6 pages, 3 figures, LaTeX2e Accepted for publication in Astronomy and Astrophysics