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24 papers · 2 filters
First Results from the Lick AGN Monitoring Project: The Mass of the Black Hole in Arp 151
Misty C. Bentz, Jonelle L. Walsh, Aaron J. Barth +24
We have recently completed a 64-night spectroscopic monitoring campaign at the Lick Observatory 3-m Shane telescope with the aim of measuring the masses of the black holes in 13 ne…
A Study of the X-Ray Dust Scattering Halo of Cyg X-1 with a Cross-Correlation Method
Zhixing Ling, Shuang Nan Zhang, Jingen Xiang +1
X-ray photons scattered by the interstellar medium carry information about dust distribution, dust grain model, scattering cross section, and the distance of the source; they also…
Supermassive Black Holes in Galactic Bulges
Yu-Qing Lou, Yan-Fei Jiang
Growing evidence indicate supermassive black holes (SMBHs) in a mass range of lurking in central stellar bulges of galaxies.Extensive observ…
Cosmology-Independent Distance Moduli of 42 Gamma-Ray Bursts between Redshift of 1.44 and 6.60
Nan Liang, Shuang Nan Zhang
This report is an update and extension of our paper accepted for publication in ApJ (arXiv:0802.4262). Since objects at the same redshift should have the same luminosity distance a…
Systematic Distortion in Cosmic Microwave Background Maps
Hao Liu, Ti-Pei Li
To minimize instrumentally induced systematic errors, cosmic microwave background (CMB) anisotropy experiments measure temperature differences across the sky using paires of horn a…
Rebound Shock Breakouts of Exploding Massive Stars: A MHD Void Model
Ren-Yu Hu, Yu-Qing Lou
With a self-similar magnetohydrodynamic (MHD) model of an exploding progenitor star and an outgoing rebound shock and with the thermal bremsstrahlung as the major radiation mechani…