IGR J16283-4838

Type Orb./Spin Period Radio Counterpart Infrared/Optical Counterpart
R.A. (J2000) Dec. (J2000) References R.A. (J2000) Dec. (J2000) References
HMXB system
probable Be system
287.6 days . . 2MASS J16281083-4838560 !!! but see Steeghs et al. Atel 478 Rodriguez & Paizis Atel 460
16h 28m 10.83s (+-0.11") -48deg 38' 56.1" (+-0.11")
Published papers
Miscellaneous :
Paizis et al. 2005 Atel 458 :
    X-ray flux increase by factor of ~2 in ~5 days
Kennea et al. 2005 Atel 459 :
    Highly absorbed in X-rays, no detected flux below 1.5 keV
Rodriguez & Paizis 2005 Atel 460 :
  • Ks = 13.95 +- 0.058,J > 16.8 , H > 15.8 (95% lower limits)
  • Infrared image can be found here (courtesy J. Rodriguez)
Markwardt et al. 2005 Atel 465:
  • RXTE spectra absorbed NH~4-5 1022 cm-2
  • Γ = 0.8-1.1
  • No pulsations
    Steeghs et al. 2005 Atel 478:
    • several sources in the Swift error circle
    • 2 MASS candidate counterpart is a blend of sources
    • Preliminary relative photometry -> K~14.1 for the brightest source resolved in Magellan/PANIC images, consistent with the K=14 2MASS source
    • A comparison between the 2MASS field and the 300s PANIC K-band image is available here (courtesy D. Steeghs)
    Beckmann et al. 2005 (ApJ):
    • Variable absorption NH~4-1722 cm-2
    • Flat spectrum Γ = 1
    • New member of highly absorbed HMXB
    • 3-σ upper limit on the flux of a 6.4 keV line is 3 x 10-4 ph/cm2 with an EW < 600 eV
    Pelizza et al. 2011 (A&A):
    • optical/IR observations with the ESO-NTT.
    • 3 candidate counterparts are located within the Swift error circle
    • Brightest (2MASS J16281083-4838560) is the most likely counterpart has parameters typical of supergiant O or B stars.
    • Distance to the source estimated to be in the range of 13.6 to 21.6 kpc.
    • Source is a member of the highly-obscured HMXBs with supergiant companions.
    Cusumano et al. 2013 (ApJ):
    • Analysis of Swift BAT monitoring and Swift XRT pointings
    • Discovery of orbital period P=287.6 days in BAT data
    • Broad band X-ray spectral analysis of 2 different phases=> absorbed cut-off power law NH=11-18 x 1022 cm-2, Γ=0-1.3, Ecut=12-27 keV
    • Source is an HMXB, probably with Be companion

    Last updated 2 August 2013

    Jerome Rodriguez