Probing dark matter with X-ray binaries
arXiv:astro-ph/0512106 · doi:10.1111/j.1745-3933.2005.00132.x
Abstract
Low-mass X-ray binaries (LMXBs), which occur in old stellar populations, have velocities exceeding those of their parent distribution by at least 20 km/s. This makes them ideal probes for dark matter, in particular in dwarf spheroidals (dSph), where the LMXBs should penetrate well outside the visible galaxy. We argue that the most likely explanation of the observation of LMXBs in the Sculptor dSph by Maccarone et al (2005) is the presence of a dark matter halo of >~ 10^9 Msun, corresponding to a total-mass to light ratio of >~ 600 (M/L_V)_sun. In this case there should be an extended halo of LMXBs which may be observable.
3 pages, accepted for publication in MNRAS
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Cited by in corpus (11)
- Galaxy Masses
- Cosmological implications of dwarf spheroidal chemical evolution
- Annihilation Signals from Asymmetric Dark Matter
- Estimating the GeV Emission of Millisecond Pulsars in Dwarf Spheroidal Galaxies
- Tidal radii and escape speeds in dwarf spheroidal galaxies under MOND and dark halos compared
- X-ray Transients: Hyper- or Hypo-Luminous?
- Spatial distribution of luminous X-ray binaries in spiral galaxies
- XMM-Newton observation of a sample of four close dSph galaxies
- X-ray Sources in the Dwarf Spheroidal Galaxy Draco
- Multiwavelength survey of X-ray sources in the Sculptor Dwarf Spheroidal Galaxy
- M/L in individual galaxies