Quest for quiescent neutron star low mass X-ray binaries in the Small Magellanic Cloud

  • Author / Creator
    Chowdhury, Md. Mizanul Huq
  • We present the first spectral search for neutron stars (NSs) in low-mass X-ray
    binaries (LMXBs) between outbursts in the Small Magellanic Cloud (SMC).
    We identify and discuss candidate LMXBs in quiescence in the SMC using
    deep Chandra X-ray observations of two portions of the SMC. We produce
    X-ray color-magnitude-diagrams of XRSs of these two fields and identify 10
    candidates for quiescent NS LMXBs. Spectral fitting and searches for optical
    counterparts rule out five, leaving five candidate quiescent NS LMXBs.
    We estimate that we are sensitive to ~10% of quiescent NS LMXBs in our
    fields. Our fields include 4.4×10^7 M⊙ of stellar mass, giving an upper limit of 10^{−6} LMXBs per M⊙ in the SMC. We place a lower limit on the average duty cycle of NS LMXBs as ~0.003.

  • Subjects / Keywords
  • Graduation date
    Spring 2011
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
  • Institution
    University of Alberta
  • Degree level
  • Department
  • Supervisor / co-supervisor and their department(s)
  • Examining committee members and their departments
    • Moez, Kambiz (Electrical and Computer Engineering)
    • Morsink, Sharon (Phyiscs)
    • Ivanova, Natasha (Physics)