805 citations · 13.6k across the 188 of their papers we have counts for
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An X-ray, IR, and Submillimeter Flare of Sagittarius A*
D. P. Marrone, F. K. Baganoff, M. R. Morris +14
Energetic flares are observed in the Galactic supermassive black hole Sagittarius A* from radio to X-ray wavelengths. On a few occasions, simultaneous flares have been detected in…
Preplanetary Nebulae: An HST Imaging Survey and a New Morphological Classification System
Raghvendra Sahai, Mark Morris, Carmen Sánchez Contreras +1
Using the Hubble Space Telescope (HST), we have carried out a survey of candidate preplanetary nebulae (PPNs). We report here our discoveries of objects having well-resolved geomet…
The spatio-kinematical structure and distance of the pre-planetary nebula IRAS 19134+2131
Hiroshi Imai, Raghvendra Sahai, Mark Morris
Using the VLBA, we have observed H2O maser emission in the pre-planetary nebula IRAS 19134+2131(I19134), in which the H2O maser spectrum has two groups of emission features separat…
A Spitzer Study of the Mass Loss Histories of Three Bipolar Pre-Planetary Nebulae
Tuan Do, Mark Morris, Raghvendra Sahai +1
We present the results of far-infrared imaging of extended regions around three bipolar pre-planetary nebulae, AFGL 2688, OH 231.8+4.2, and IRAS 163423814, at 70 and 160 m wi…
A Constant Spectral Index for Sagittarius A* During Infrared/X-ray Intensity Variations
S. D. Hornstein, K. Matthews, A. M. Ghez +5
We report the first time-series of broadband infrared (IR) color measurements of Sgr A*, the variable emission source associated with the supermassive black hole at the Galactic Ce…
Discovery of hot supergiant stars near the Galactic center
Jon C. Mauerhan, Michael P. Muno, Mark Morris
We report new results of a campaign to find Wolf-Rayet and O (WR/O) stars and high-mass X-ray binaries (HMXBs) in the Galactic center. We searched for candidates by cross-correlati…