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20 papers · 2 filters
Twelve years of X-ray and optical variability in the Seyfert galaxy NGC 4051
E. Breedt, I. M. McHardy, P. Arevalo +7
We discuss the origin of the optical variations in the Narrow line Seyfert 1 galaxy NGC 4051 and present the results of a cross-correlation study using X-ray and optical light curv…
The Stellar Mass Components of Galaxies: Comparing Semi-Analytical Models with Observation
Lei Liu, Xiaohu Yang, H. J. Mo +2
We compare the stellar masses of central and satellite galaxies predicted by three independent semianalytical models with observational results obtained from a large galaxy group c…
Testing the Accretion Flow with Plasma Wave Heating Mechanism for Sagittarius a* by the 1.3MM Vlbi Measurements
Lei Huang, Rohta Takahashi, Zhi-Qiang Shen
The vicinity of the supermassive black hole associated with the compact radio source Sagittarius (Sgr) A* is believed to dominate the observed emission at wavelengths near and shor…
Absolute positions of 6.7-GHz methanol masers
Y. Xu, M. A. Voronkov, J. D. Pandian +5
The ATCA, MERLIN and VLA interferometers were used to measure the absolute positions of 35 6.7 GHz methanol masers to subarcsecond or higher accuracy. Our measurements represent es…
Polarized Emission of Sagittarius A*
Lei Huang, Siming Liu, Zhi-Qiang Shen +4
We explore the parameter space of the two temperature pseudo-Newtonian Keplerian accretion flow model for the millimeter and shorter wavelength emission from Sagittarius A*. A gene…
Milky Way vs Andromeda: a tale of two disks
J. Yin, J. L. Hou, N. Prantzos +4
We study the chemical evolution of the disks of the Milky Way (MW) and of Andromeda (M31), in order to reveal common points and differences between the two major galaxies of the Lo…