to X-ray state ¨ Compact hard state jet ¨ Lorentz factor increases as intensity rises ¨ Internal shocks cause outbursts ¨ Constrain duty cycles using a proper census Fender, Belloni & Gallo (2004) Migliari & Fender (2006)
frequency spectrum to determine power-law shape ¨ Determines if a low- energy cutoff exists ¨ Implications for electron acceleration mechanisms ¨ Low-frequency turnover can constrain surrounding gas density van der Horst (2007)
¨ Archetypal microquasar: compact jet and occasional relativistic outbursts ¨ Two IRAS sources equidistant and aligned with the jet axis ¨ Proposed as the interactions of the jet with the ISM Rodriguez & Mirabel (1998) Kaiser et al. (2004)
in the hard state ¨ Several transient outbursts per year will be detected ¨ Primarily explosive synchrotron events ¨ Slow evolution and long timescales at low frequencies ¨ Bright for many weeks to months after outburst ¨ Good census of transient sources
frequencies ¨ X-ray binaries show low-frequency variability ¨ Wide fields of view available enable radio sky monitoring for the first time ¨ Delayed rise in synchrotron events ¨ Low surface brightness sensitivity key to probing environments ¨ Good prospects for LOFAR!