12 papers · 1 filter
A search for OH 6 GHz maser emission towards supernova remnants
Korinne E. McDonnell, Mark Wardle, Alan E. Vaughan
OH masers at 1720 MHz have proven to be excellent indicators of interactions between supernova remnants and molecular clouds. OH excitation calculations suggest that the 6049 MHz O…
Cyanopolyynes and sulphur bearing species in hot cores: Chemical and line excitation models
J. F. Chapman, M. Wardle, T. J. Millar +2
We present results from a time dependent gas phase chemical model of a hot core based on the physical conditions of G305.2+0.2. While the cyanopolyyne HC_3N has been observed in ho…
Massive Star Formation Near Sgr A* and Bimodal Star Formation in the Nuclear Disk
F. Yusef-Zadeh, M. Wardle
The history of star formation in the strong gravitational potential of the Galactic center has been of much interest, recently. We propose that the sub-parsec-scale disk of massive…
ATCA 1.2 cm Observations of the Massive Star Forming Region G305.2+0.2
Andrew J. Walsh, Jacqueline F. Chapman, Michael G. Burton +2
We report on Australia Telescope observations of the massive star forming region G305.2+0.2 at 1.2 cm. We detected emission in five molecules towards G305A, confirming its hot core…
Flaring Activity of Sgr A*: Expanding Hot Blobs
F. Yusef-Zadeh, M. Wardle, D. A. Roberts +5
Sgr A* is considered to be a massive black hole at the Galactic center and is known to be variable in radio, millimeter, near-IR and X-rays. Recent multi-wavelength observing campa…
Early Disk Evolution
Mark Wardle
A variety of processes play a role in the evolution of protostellar disks. Here I focus on the uncertain issue of magnetic field-disk coupling and its implications for magnetically…