76 citations · 581 across the 46 of their papers we have counts for
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An Optical-Infrared Study of the Young Multipolar Planetary Nebula NGC 6644
Chih-Hao Hsia, Sun Kwok, Yong Zhang +2
High-resolution HST imaging of the compact planetary nebula NGC 6644 has revealed two pairs of bipolar lobes and a central ring lying close to the plane of the sky. From mid-infrar…
Quark nova imprint in the extreme supernova explosion SN 2006gy
Rachid Ouyed, Mathew Kostka, Nico Koning +2
The extremely luminous supernova 2006gy (SN 2006gy) is among the most energetic ever observed. The peak brightness was 100 times that of a typical supernova and it spent an unheard…
Criss-cross mapping BD+30 3639: a new kinematic analysis technique
Wolfgang Steffen, Francisco Tamayo, Nico Koning
We present a new analysis of kinematic data of the young planetary nebula BD+30 3639. The data include spectroscopic long-slit and internal proper motion measurements. In this pape…
Three-Dimensional Structure of the Central Region of NGC7027: A Quest for Trails of High-Velocity Jets
Jun-ichi Nakashima, Sun Kwok, Yong Zhang +1
We report on the results of a radio interferometric observation of NGC7027 in the CO J=2-1 and 13CO J=2-1 lines. The results are analyzed with morpho-kinematic models developed fro…