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High-altitude Magnetospheric Emissions from Two Pulsars
Mao Yuan, Weiwei Zhu, Michael Kramer +21
We discover three new weak pulse components in two known pulsars, one in PSR J0304+1932 and two in PSR J1518+4904. These components are emitted about half way between the main emis…
Searching for the nano-Hertz stochastic gravitational wave background with the Chinese Pulsar Timing Array Data Release I
Heng Xu, Siyuan Chen, Yanjun Guo +24
Observing and timing a group of millisecond pulsars (MSPs) with high rotational stability enables the direct detection of gravitational waves (GWs). The GW signals can be identifie…
Strange Matter: a state before black hole
Renxin Xu, Yanjun Guo
Normal baryonic matter inside an evolved massive star can be intensely compressed by gravity after a supernova. General relativity predicts formation of a black hole if the core ma…
Massive Pulsars and Ultraluminous X-ray Sources
Yanjun Guo, Hao Tong, Renxin Xu
The detection of 1.37s pulsations from NuSTAR J095551+6940.8 implies the existence of an accreting pulsar, which challenges the conventional understanding of ultraluminous X-r…
An Ultra Low Mass and Small Radius Compact Object in 4U 1746-37?
Zhaosheng Li, Zhijie Qu, Li Chen +3
Photospheric radius expansion (PRE) bursts have already been used to constrain the masses and radii of neutron stars. RXTE observed three PRE bursts in 4U 1746-37, all with low tou…
To understand the X-ray spectrum of anomalous X-ray pulsars and soft gamma-ray repeaters
Yan-Jun Guo, Shi Dai, Zhao-Sheng Li +3
Hard X-rays above 10 keV are detected from several anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs), and different models have been proposed to explain the physic…
Hard X-ray emission cutoff in anomalous X-ray pulsar 4U 0142+61 detected by INTEGRAL
Wei Wang, Hao Tong, Yan-Jun Guo
The anomalous X-ray pulsar 4U 0142+61 was studied by the INTEGRAL observations. The hard X-ray spectrum of 18 -- 500 keV for 4U 0142+61 was derived using near 9 years of INTEGRAL/I…
Compressed Baryonic Matter of Astrophysics
Yanjun Guo, Renxin Xu
Baryonic matter in the core of a massive and evolved star is compressed significantly to form a supra-nuclear object, and compressed baryonic matter (CBM) is then produced after su…