- California Institute of TechnologyUS1.2k papers
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123 papers · 1 filter
Shocked Molecular Gas in the Supernova Remnant HB 21
Bon-Chul Koo, Jeonghee Rho, William T. Reach +2
We report the discovery of the shocked molecular gas in the supernova remnant HB 21. We derive the physical parameters of the shocked gas from CO J=1-0 and J=2-1 line observations.…
A Large-Scale Jet and FR I Radio Source in a Spiral Galaxy: The Host Properties and External Environment
Michael J. Ledlow, Frazer N. Owen, Min S. Yun +1
We have identified a large (~200 kpc), powerful double radio source whose host galaxy is clearly a disk and most likely a spiral. This FR I radio galaxy is located very near the ce…
Subparsec-scale HI in the nucleus of NGC 4151
C. G. Mundell, J. M. Wrobel, A. Pedlar +1
We present sensitive, high-resolution 21-cm VLBA+VLA observations of the radio jet and nuclear HI absorption in NGC 4151. The 25-mas (1.6-pc) resolution continuum image reveals a h…
The Nature of Flat-Spectrum Nuclear Radio Emission in Seyfert Galaxies
C. G. Mundell, A. S. Wilson, J. S. Ulvestad +1
Parsec-scale VLBA imaging of five Seyfert galaxies with flat-spectrum radio nuclei was conducted to determine whether the flat spectrum represents thermal emission from the accreti…
Parsec-Scale Jets and Tori in Seyfert Galaxies
A. L. Roy, J. M. Wrobel, A. S. Wilson +6
What causes the dichotomy between very powerful and very weak radio emission from AGNs? Perhaps the engines are the same but the jets get disrupted by dense ISM in radio-quiet obje…
Discovery of Five Binary Radio Pulsars
F. Camilo, A. G. Lyne, R. N. Manchester +8
We report on five binary pulsars discovered in the Parkes multibeam Galactic plane survey. All of the pulsars are old, with characteristic ages 1-11 Gyr, and have relatively small…