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34 papers · 2 filters
A size of ~1 AU for the radio source Sgr A* at the centre of the Milky Way
Zhi-Qiang Shen, K. Y. Lo, M. -C. Liang +2
Although it is widely accepted that most galaxies have supermassive black holes (SMBHs) at their centers^{1-3}, concrete proof has proved elusive. Sagittarius A* (Sgr A*)^4, an ext…
Radiatively Inefficient Accretion Flow in the Nucleus of NGC 1097
Rodrigo S. Nemmen, Thaisa Storchi-Bergmann, Feng Yuan +3
We present a model for the accretion flow around the supermassive black hole in the LINER nucleus of NGC 1097 which fits the optical to X-ray spectral energy distribution (SED). Th…
The Distance to the Perseus Spiral Arm in the Milky Way
Y. Xu, M. J. Reid, X. W. Zheng +1
We have measured the distance to the massive star-forming region W3OH in the Perseus spiral arm of the Milky Way to be 1.95 0.04 kilo-parsecs ( km). This d…
The soft X-ray properties of quasars in the Sloan Digital Sky Survey
Shiyin Shen, Simon D. M. White, H. J. Mo +4
We use the ROSAT All Sky Survey (RASS) to study the soft X-ray properties of a homogeneous sample of 46,420 quasars selected from the third data release of the Sloan Digital Sky Su…
The influence of baryons on the clustering of matter and weak lensing surveys
Y. P. Jing, Pengjie Zhang, W. P. Lin +2
Future weak lensing measurements of cosmic shear will reach such high accuracy that second order effects in weak lensing modeling, like the influence of baryons on structure format…
Isolating the decay rate of cosmological gravitational potential
Pengjie Zhang
The decay rate of cosmological gravitational potential measures the deviation from Einstein-de Sitter universe and can put strong constraints on the nature of dark energy and gravi…