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Article overview
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Massive Pulsars and Ultraluminous X-ray Sources | | Yanjun Guo
; Hao Tong
; Renxin Xu
; | | Date: |
3 Aug 2015 | | Abstract: | The detection of 1.37$, $s pulsations from NuSTAR J095551+6940.8 implies the
existence of an accreting pulsar, which challenges the conventional
understanding of ultraluminous X-ray source. This kind of sources are proposed
to be massive pulsars in this paper. Considering the general relativistic
effect, stronger gravity of massive pulsars could lead to a larger maximum
luminosity, scaled as the Eddington luminosity. The pseudo-Newtonian potential
is employed to simulate the gravitational field in general relativity, and the
Eddington luminosity is calculated for self-bound stars (quark star and
quark-cluster star) and for the Tolman IV solution. It is found that, for a
massive pulsar with radius close to the Schwarszchild radius, the Eddington
luminosity could be as high as $2 imes10^{39} , {
m erg, s}^{-1}$. It is
able to account for the X-ray luminosity of NuSTAR J095551+6940.8 with
reasonable beaming factor. It is also suggested that massive pulsar-like
compact stars could form via this super-Eddington phase of ultraluminous X-ray
source. | | Source: | arXiv, 1508.0390 | | Services: | Forum | Review | PDF | Favorites | |
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