Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21536007m&link_type=abstract
American Astronomical Society, AAS Meeting #215, #360.07; Bulletin of the American Astronomical Society, Vol. 42, p.548
Astronomy and Astrophysics
Astrophysics
Scientific paper
Quiescent low mass X-ray binaries (qLMXBs) in Milky Way globular clusters (MWGCs) are an excellent diagnostic tool for studying several fundamental questions in astrophysics, including the nature of the equation of state (EoS) of neutron stars (NSs), the mechanism of binary system formation, the internal dynamics of compact stellar systems and the accretion process. Due to their accurately known distances and reddening/NH measures, the luminosity of GC XBs can be calculated far more precisely than that of XBs found in the field. The 12(13) luminous (L>1x1036 erg/s) XBs in MWGCs have been known for several (many) years but qLMXBs in MWGCs have only recently begun to be identified thanks to the advances in sensitivity and spatial resolution of the Chandra and XMM-Newton observatories. While low luminosity XB searches of MWGCs using these two great observatories now constitute an active field of research, there remain dozens of MWGCs for which the most sensitive previous X-ray observation is that of the ROSAT all-sky survey (RASS; hereafter RASS-MWGCs). For many RASS-MWGCs, the lower sensitivity threshold of the qLMXB population can be reached with relatively short exposures of the X-ray Telescope on-board the Swift Gamma-Ray Burst Observatory (Swift).
I will discuss a systematic survey of unobserved nearby MWGCs, with Swift, which is creating a pathway to identifying their qLMXB populations, allowing follow-up observations with larger observatories. I will present statistics of the candidate qLMXBs identified in the Swift observing campaign, discuss follow-up measurements with XMM-Newton and Chandra and present prospects for answering vital questions about both the evolution of GCs and neutron stars themselves.
Dhuga Kalvir
Eskandarian A.
Morris David C.
Parke William
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