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44 papers · 1 filter
Accretion Disk Spectra of the Brightest Ultra-luminous X-ray Source in M82
Feng Yuan, Ronald E. Taam R. Misra, Xue-Bing Wu +1
Emission spectra of hot accretion disks characteristic of advection dominated accretion flow (ADAF) models are investigated for comparison with the brightest ultra-luminous source,…
Inclination-Dependent Luminosity Function of Spiral Galaxies in the Sloan Digital Sky Survey: Implication for Dust Extinction
Zhengyi Shao, Quanbao Xiao, Shiyin Shen +3
Using a samples of 61506 spiral galaxies selected from the SDSS DR2, we examine the luminosity function (LF) of spiral galaxies with different inclination angles. We find that the…
Phase-reference VLBI Observations of the Compact Steep-Spectrum Source 3C 138
Zhi-Qiang Shen, L. -L. Shang, D. -R. jiang +2
We investigate a phase-reference VLBI observation that was conducted at 15.4 GHz by fast switching VLBA antennas between the compact steep-spectrum radio source 3C 138 and the quas…
High-resolution Millimeter-VLBI Imaging of Sgr A*
Zhi-Qiang Shen
We present the highest resolution VLBI imaging observations of Sgr A* made at both 7 and 3.5 mm. These data reveal wavelength-dependent intrinsic sizes with an intrinsic emitting r…
Dual-frequency VSOP Imaging of a High-redshift Radio Quasar PKS 1402+044
Jun Yang, Leonid Gurvits, Andrei Lobanov +2
Based on the VLBI Space Observatory Programme (VSOP) observations at 1.6 and 5 GHz, we find that the luminous high-redshift (z=3.215) quasar PKS 1402+044 (J1405+0415) has a pronoun…
Probing the Mass Distributions in NGC 1407 and Its Associated Group with the X-ray Imaging Spectroscopic and Optical Photometric and Line-strength Indices Data
Zhongli Zhang, Haiguang Xu, Yu Wang +3
We present a study of the mass distributions in the bright E0 galaxy NGC 1407 and its associated group by analyzing the high quality Chandra and ROSAT X-ray spectroscopic data. In…