X-ray timing analysis of the quasar PG 1211+143
  We report on a timing analysis of a new ~630ks XMM-Newton observation of the
quasar, PG 1211+143. We find a well-defined X-ray power spectrum with a
well-detected bend at ~7e-5 Hz, consistent with the established
bend-timescale--black-hole-mass correlation for luminous, accreting black
holes. We find the linear rms-flux relation commonly observed in accreting
black hole systems and investigate the energy-dependence of the rms. The
fractional rms is roughly constant with energy on short timescales (< 1 day;
within observations) whereas there is enhanced soft band variability on long
timescales (between observations typically spaced by a few days). Additionally,
we also report on the optical--UV variability using the OM on-board XMM-Newton
and a ~2-month-long overlapping monitoring programme with Swift. We find that,
although there is little UV variability within observations (<1 day), UV
variations of a few per cent exist on time-scales of ~days--weeks.
