IGR J18450-0435

Other name = AX J1845.0-0433

Type Mass Radio Counterpart Infrared Counterpart
R.A. (J2000) Dec. (J2000) References (position) R.A. (J2000) Dec. (J2000) References (position)
Published Papers
Miscellaneous :

Halpern & Gotthelf (2006, ATel:688): identify AX J1845.0-0433 as the likely counterpart.

Sguera et al. (2007, A&A):
  • INTEGRAL and Swift observations
  • fast flaring activity on timescale few tens of minutes
  • 2 outbursts seen by INTEGRAL
  • 2 other outbursts seen by Swift
  • refined Swift position confirms associations with the ASCA source
  • COnfirmation of HMXB nature => SFXT, and recurrent transient behaviour

Zurita Heras & Walter (2009, A&A):
  • INTEGRAL and Swift observations
  • INTEGRAL and XMM-Newton observations
  • Confirm the O9.5 I nature of the companion
  • Quiescent luminosity L(0.2-100 keV) ~ 1e35 erg/s seen with both satellites
  • Binary separation of ~3 Rstar (higher than in other known supergiant HMXB)
  • 2 bright and short flares (XMM) reaching L~1e36 erg/s => maximum variability factor of 50 on time scale ~few hundreds of seconds
  • Broad-band spectrum typical of wind-fed accreting pulsars: absorbed cut-off power law with NH= 2.6 x 1022 cm-2, Γ=0.7-0.9 and Ecut=16 keV
  • Soft excess fitted with a black body kT=0.18 keV
  • Optically-thin and highly-ionised iron (Fe XVIII-XIX) detected during quiescence.
  • Flare characteristics suggest massive clumps are formed within the stellar wind of Sg companion

Last updated: 12 Feb 2009

Jerome Rodriguez