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Nov 14, 2022

Study reveals nature of single-line spectroscopic binary with δ Scuti pulsating star KIC 10417986

Researchers carried out the time-domain spectroscopic observation of KIC 10417986 with the Nanshan 1.2-m Optical Telescope and Xinglong 2.16-m Telescope. They obtained the orbital parameters and stellar parameters of the binary system fo...Binary systems are ideal for accurately identifying the basic physical parameters, such as mass, radius and luminosity, of the stars. In particular, pulsating variable stars are of great significance, as they offer means for detecting th...
Sep 30, 2022

Researchers propose RFI mitigation and signal restoration method for pulsar signals

Using pulsar data collected by the NanShan 26-m Radio Telescope (NSRT) from 2011 to 2014, researchers from the Xinjiang Astronomical Observatory (XAO) of Chinese Academy of Sciences made a study on RFI mitigation and signal restoration, ...Pulsar signals obtained with radio telescopes are extremely weak. Generally, there are two primary difficulties in pulsar signal processing, one is the radio-frequency interference (RFI) mitigation, and the other one is information loss ...
Sep 29, 2022

Emissions in different regions in the pulsar magnetosphere

The researchers from XAO found that the emissions of the different states can be generated in different regions in the pulsar magnetosphere by analyzing the polarization of PSR J0614+2229 and PSR J1938+2213 using FAST observations.Mode changing is an emission phenomenon where the mean pulse profile abruptly changes between two or sometimes more stable states. In theory, the changes of the current flow in the inner acceleration region (IAR) or pulsar magnetosphere ...
Sep 14, 2022

Ultra-wide Bandwidth Observations of 19 Pulsars with Parkes Telescope

The spectrum of pulsars is usually power-law, and pulsars are usually highly polarized. The shape and width of the average pulse profile mainly change with frequencies. Studying the emission intensity, polarization and spectrum of pulse ...
Aug 21, 2022

Secondarily Einstein arc produced by companion galaxies discovered for the first time in a galaxy-quasar double-image gravitational lens

researchers detected and verified the existence of a secondarily-lensed Einstein arc caused by its companion galaxy in the CLASS lens B1152+199, by analyzing the Hubble Space Telescope (HST) optical-near-infrared tricolor images and the ...A research team led by Dr. ZHANG Ming from the Galaxy Cosmology Group at Xinjiang Astronomical Observatory (XAO), Chinese Academy of Sciences (CAS), detected and verified the existence of a secondarily-lensed Einstein arc caused by its c...
Aug 15, 2022

Study Reveals What Causes "Outliers" Track in Black Hole X-ray Binaries

A research team from the Galaxies and Cosmology Research Group of the Xinjiang Astronomical Observatory (XAO) of the Chinese Academy of Sciences (CAS) have investigated the BH spin contribution to jet power (BZ-jet), especially for the m...The black hole X-ray binaries (BHXB) are hosted by a stellar-mass black hole which accretes gas from a companion star and emits transient X-ray emission and compact radio jets.There are strong correlations between the radio luminosity LR...

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