IGR J16194-2810

Other name = 1 RXH 161933.0-280738

Type Companion type Radio Counterpart Infrared/Optical Counterpart
R.A. (J2000) Dec. (J2000) References R.A. (J2000) Dec. (J2000) References
Symbiotic X-ray Binary
probable NS primary
M2 III USNO A2.0 U0600-20227091 Masetti et al. 2007A&A, 470, 331
Miscellaneous :
Stephen et al. 2006 :
  • B=13.6-14.0, J=8.3, H=7.3, K=7
Masetti et al. 2007:
  • Multiwavelength studies of this object => Swift/XRT observations allowing refinement of the X-ray position
  • Identify USNO A2.0 U0600-20227091 as the optical counterpart to the X-ray source.
  • Optical spectrum shows several lines => they identify it as a M2 III star
  • They can set an upper limit on the distance to the source of 3.7 kpc.
  • IGR J16194-2810 a new symbiotic X-ray binary.
  • Typical X-ray spectral parameters are an absorption column density of NH= 1.6 10 21 cm-2, + comptt model with kT0=0.63 keV, kTe=7.6 keV, Τ=6.8 => more typical of a neutron star primary.
Ratti et al. 2010 (MNRAS):
  • Chandra + optical observations
  • Confirm the optical counterpart previously suggested
  • Also present in 2MASS with J=8.268, H=7.333, K=6.984
  • apparent magnitude r'=10.98
  • Confirm the source is a Symbiotic XRB
  • d=3.0 kpc
Kitamura et al. 2013 (PASJ):
  • Analysis of Suzaku observations in the low hard state
  • Two emission components in the source spectra
    • Below 2 keV: either a raw black body 0.4 keV and R~1.7 km or Comptonized emission with kT 0.1 keV and R~ 75 km
    • Above 2 keV: Comptonized black body emissoin with kTseded~ 1.0 keV and R~700m
  • Power spectrum has a continuum in f-1.04 with no significant periodic features
  • Smaller radius and higher temp of hard component (compared to other LMXB) might be due to stronger magnetic field

Last updated 3 Sept. 2013

Jerome Rodriguez