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6 papers · 2 filters
Binaries migrating in a gaseous disk: Where are the Galactic center binaries?
C. Baruteau, J. Cuadra, D. N. C. Lin
The massive stars in the Galactic center inner arcsecond share analogous properties with the so-called Hot Jupiters. Most of these young stars have highly eccentric orbits, and wer…
Multiwavelength VLBI observations of Sagittarius A*
R. -S. Lu, T. P. Krichbaum, A. Eckart +5
The compact radio source Sgr\,A*, associated with the super massive black hole at the center of the Galaxy, has been studied with VLBA observations at 3 frequencies (22, 43, 86\,GH…
Cosmological evolution of massive black holes: effects of Eddington ratio distribution and quasar lifetime
Xinwu Cao
A power-law time-dependent lightcurve for active galactic nuclei (AGNs) is expected by the self-regulated black hole growth scenario, in which the feedback of AGNs expels gas and s…
Distance and Proper Motion Measurement of the Red Supergiant, S Persei, with VLBI H2O Maser Astrometry
Y. Asaki, S. Deguchi, H. Imai +3
We have conducted VLBA phase-referencing monitoring of H2O masers around the red supergiant, S Persei, for six years. We have fitted maser motions to a simple expanding-shell model…
ATCA observations of SiO masers in the Galactic center
Juan Li, Tao An, Zhi-Qiang Shen +1
We present the Australia Telescope Compact Array (ATCA) observations of the SiO masers in the Galactic center in transitions of v=1, J=2--1 at 86 GHz and v=1, J=1--0 at 43 GHz. Two…
The Wolf-Rayet features and mass-metallicity relation of long-duration gamma-ray burst host galaxies
X. H. Han, F. Hammer, Y. C. Liang +4
Aims. We have gathered optical spectra of 8 long-duration GRB host galaxies selected from the archival data of VLT/FORS2. We investigated whether or not Wolf-Rayet (WR) stars can b…