X-Ray Binaries in Globular Clusters
نویسندگان
چکیده
منابع مشابه
X-ray Binaries and Globular Clusters in Elliptical Galaxies
The X-ray emission from normal elliptical galaxies has two major components: soft (kT ≈ 0.2 − 1 keV) emission from diffuse gas and harder (kT ≈ 6 keV) emission from populations of accreting (lowmass) stellar X-ray binaries (LMXB). If the LMXB population is intimately tied to the field stellar population in a galaxy, its aggregate X-ray luminosity is expected to be simply proportional to the opt...
متن کاملGalactic Globular Clusters with Luminous X-Ray Binaries
Luminous X-ray binaries (>10 erg s, LMXBs) have a neutron star or black hole primary, and in globular clusters, most of these close binaries are expected to be have evolved from wider binaries through dynamical interactions with other stars. We sought to find a predictor of this formation rate that is representative of the initial properties of globular clusters rather than of the highly evolve...
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We summarize and discuss recent work (Fregeau 2007) that presents the confluence of three results suggesting that most Galactic globular clusters are still in the process of core contraction, and have not yet reached the thermal equilibrium phase driven by binary scattering interactions: that 1) the three clusters that appear to be overabundant in X-ray binaries per unit encounter frequency are...
متن کاملPrimordial Globular Clusters , X - Ray Binaries & Cosmological Reionisation
Globular clusters are dense stellar systems that have typical ages of ∼ 13 billion years, implying that they formed during the early epochs of galaxy formation at redshifts of z ∼ > 6. Massive stars in newly formed or primordial globular clusters could have played an important role during the epoch of cosmological reionisation (z ∼ > 6) as sources of energetic, neutral hydrogen ionising UV phot...
متن کاملBinaries in Globular Clusters
Binary stars in a globular cluster (hereafter, GC) may be primordial (i.e. formed along with the cluster), or the result of cluster dynamics. “Dynamical” binaries can result from conservative threebody encounters (e.g. Spitzer, 1987) if a third star can carry away enough kinetic energy to leave two others bound, or from dissipative two-body encounters, if two stars happen to pass within a few s...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1988
ISSN: 0074-1809
DOI: 10.1017/s0074180900042595