Estimation of Magnetic Field Strength in the Turbulent Warm Ionized Medium (2009)
Wu, Qingwen, Kim, Jongsoo, Ryu, Dongsu, Cho, Jungyeon, Alexander, Paul
We studied Faraday rotation measure (RM) in turbulent media with the rms Mach number of unity, using isothermal, magnetohydrodynamic turbulence simulations. Four cases with different values of...
Accretion/Jet Activity and Narrow [O III] Kinematics in Young Radio Galaxies (2009)
Wu, Qingwen, Gu, Minfeng, Humphrey, Andrew
We estimate black hole masses and Eddington ratios for a sample of 81 young radio galaxies (42 CSS +39 GPS). We find that the average black hole (BH) mass of these young radio galaxies is ~8.3, which...
Observational Evidence for Young Radio Galaxies are Triggered by Accretion Disk Instability (2009)
The bolometric luminosities and black hole (BH) masses are estimated by various methods for a sample of young radio galaxies with known ages. We find that the ages are positively correlated with the...
The BH masses and the Eddington ratios for a sample of 65 young radio galaxies [27 GPS and 38 CSS sources] are estimated by various methods. We find that the average BH mass of these young radio...
On the BL Lacertae objects/radio quasars and the FRI/II dichotomy (2009)
Xu, Ya-Di, Cao, Xinwu, Wu, Qingwen
In the frame of unification schemes for radio-loud active galactic nuclei (AGNs), FR I radio galaxies are believed to be BL Lacertae (BL Lac) objects with the relativistic jet misaligned to our line...
The Hard X-ray Spectral Evolution in XRBs, AGNs and ULXs (2008)
We explore the relationship between the hard X-ray photon index $\Gamma$ and the Eddington ratio (\xi=L_{X}(0.5-25 keV)/L_{Edd}) in six XRBs. We find that different XRBs follow different...
Origin of the X-ray Emission in the Nuclei of FR Is (2008)
Wu, Qingwen, Yuan, Feng, Cao, Xinwu
We investigate the X-ray origin in FRIs using the multi-waveband high resolution data of eight FR I sources, which have very low Eddington ratios. We fit their multi-waveband spectrum using a coupled...
We calculate the jet power of the classical Blandford-Znajek(BZ) model and hybrid model developed by Meier based on the global solutions of advection dominated accretion flows (ADAFs) surrounding...
We investigate the relationship between the hard X-ray photon index $\Gamma$ and the Eddington ratio ($\xi=L_{X}(0.5-25 \rm keV)/L_{Edd}$) in six X-ray binaries (XRBs) with well constrained black...
On the origin of X-ray emission in some FR Is: ADAF or jet? (2007)
Wu, Qingwen, Yuan, Feng, Cao, Xinwu
We investigate the X-ray origin in FR Is using the radio, submillimetre, optical, and {\em Chandra} X-ray data of a small sample consisting of eight FR I sources. These sources are very dim, with...
The relation between star formation rate and accretion rate in LINERs (2006)
It is argued that there is a linear correlation between star formation rate (SFR) and accretion rate for normal bright active galactic nuclei (AGNs). However, it is still unclear whether this...
Origin of Radio Emission from Nearby Low-Luminosity Active Galactic Nuclei (2004)
We use the observational data in radio, optical and X-ray wavebands, for a sample of active galactic nuclei (AGNs) with measured black hole masses, to explore the origin of radio emission from nearby...