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XMM-Newton Detection of Hot Gas in the Eskimo Nebula: Shocked Stellar Wind or Collimated Outflows?
M. A. Guerrero, Y. -H. Chu, R. A. Gruendl +1
The Eskimo Nebula (NGC 2392) is a double-shell planetary nebula (PN) known for the exceptionally large expansion velocity of its inner shell, ~90 km/s, and the existence of a fast…
FUSE Observations of Nebular O VI Emission from NGC 6543
R. A. Gruendl, Y. -H. Chu, M. A. Guerrero
NGC 6543 is one of the few planetary nebulae (PNe) whose X-ray emission has been shown to be extended and originate from hot interior gas. Using FUSE observations we have now detec…
Clusters in the Luminous Giant HII Regions in M101
C. -H. Rosie. Chen, You-Hua Chu, Kelsey E. Johnson
(Abridged) We have obtained HST WFPC2 observations of three very luminous but morphologically different giant HII regions (GHRs) in M101, NGC5461, NGC5462, and NGC5471, in order to…
The Nebular Environment and Enigmatic Hard X-ray Emission of the Hot DO White Dwarf KPD 0005+5106
You-Hua Chu, Robert A. Gruendl, Rosa M. Williams +2
We have detected an ionized nebula around the hot DO white dwarf KPD 0005+5106, and used the [OIII]/H-alpha ratios and nebular velocities to separate this nebula from the backgroun…
Physical Structure of Planetary Nebulae. III. The Large and Evolved NGC 1360
Daniel B. Goldman, Martin A. Guerrero, You-Hua Chu +1
NGC 1360 is a large planetary nebula (PN) without an obvious shell morphology. We have analyzed H-alpha images and high-dispersion echelle spectra of NGC 1360 in order to construct…
An Optical and X-ray Examination of Two Radio Supernova Remnant Candidates in 30 Doradus
Y. -H. Chu, R. A. Gruendl, C. -H. R. Chen +2
The giant HII region 30 Doradus is known for its violent internal motions and bright diffuse X-ray emission, suggesting the existence of supernova remnants (SNRs), but no nontherma…
Mz 3, a Multipolar Nebula in the Making
Martin A. Guerrero, You-Hua Chu, Luis F. Miranda
The nebula Mz 3 has arguably the most complex bipolar morphology, consisting of three nested pairs of bipolar lobes and an equatorial ellipse. Its three pairs of bipolar lobes shar…
Physical Structure of Planetary Nebulae. II. NGC 7662
Martin A. Guerrero, Elizabeth G. Jaxon, You-Hua Chu
We present a study of the structure and kinematics of the triple-shell planetary nebula NGC 7662 based on long-slit echelle spectroscopic observations and HST archival narrow-band…
Parsec-scale X-ray Flows in High-mass Star-forming Regions
L. Townsley, E. Feigelson, T. Montmerle +4
We present Chandra/ACIS images of several high-mass star-forming regions. The massive stellar clusters powering these HII regions are resolved at the arcsecond level into hundreds…
The Nature of SN 1961V
You-Hua Chu, Robert A. Gruendl, Christopher J. Stockdale +3
The nature of SN 1961V has been uncertain. Its peculiar optical light curve and slow expansion velocity are similar to those of super-outbursts of luminous blue variables (LBVs), b…
Hot Interstellar Gas and Stellar Energy Feedback in the Antennae Galaxies
J. M. Metz, R. L. Cooper, M. A. Guerrero +3
We have analyzed Chandra archival observations of the Antennae galaxies to study the distribution and physical properties of its hot interstellar gas. Eleven distinct diffuse X-ray…
Energy Crisis in the Superbubble DEM L 192 (N 51D)
R. L. Cooper, M. A. Guerrero, Y. -H. Chu +2
Superbubbles surrounding OB associations provide ideal laboratories to study the stellar energy feedback problem because the stellar energy input can be estimated from the observed…