Detecting gravitational waves from the galactic center with Pulsar
  Timing
  Black holes orbiting the Super Massive Black Hole (SMBH) Sgr A* in the
Milky-way galaxy center (GC) generate gravitational waves. The spectrum, due to
stars and black holes, is continuous below 40 nHz while individual BHs within
about 200 AU of the central SMBH stick out in the spectrum at higher
frequencies. The GWs can be detected by timing radio pulsars within a few
parsecs of this region. Future observations with the Square Kilometer Array of
such pulsars with sufficient timing accuracy may be sensitive to signals from
intermediate mass BHs (IMBH) in a 3 year observation baseline. The recent
detection of radio pulsations from the magnetar SGR J1745-29 very near the GC
opens up the possibilities of detecting millisecond pulsars (which can be used
as probes of the GWs) through lines of sight with only moderate pulse and
angular broadening due to scattering.
