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Suzaku and XMM-Newton Observations of Diffuse X-ray Emission from the Eastern Tip Region of the Carina Nebula
Yuichiro Ezoe, Kenji Hamaguchi, Robert A. Gruendl +3
The eastern tip region of the Carina Nebula was observed with the Suzaku XIS for 77 ks to conduct a high-precision spectral study of extended X-ray emission. XMM-Newton EPIC data o…
Multiple and Precessing Collimated Outflows in the Planetary Nebula IC 4634
M. A. Guerrero, L. F. Miranda, A. Riera +6
With its remarkable double-S shape, IC 4634 is an archetype of point-symmetric planetary nebulae (PN). In this paper, we present a detailed study of this PN using archival HST WFPC…
An X-ray Survey of Wolf-Rayet Stars in the Magellanic Clouds. I. The Chandra ACIS Dataset
Martin A. Guerrero, You-Hua Chu
Wolf-Rayet (WR) stars are evolved massive stars with strong fast stellar winds. WR stars in our Galaxy have shown three possible sources of X-ray emission associated with their win…
An X-ray Survey of Wolf-Rayet Stars in the Magellanic Clouds. II. The ROSAT PSPC and HRI Datasets
Martin A. Guerrero, You-Hua Chu
Wolf-Rayet (WR) stars in the Magellanic Clouds (MCs) are ideal for studying the production of X-ray emission by their strong fast stellar winds. We have started a systematic survey…
Were All Massive Stars Born in OB Associations and Clusters?
You-Hua Chu, Robert A. Gruendl
It has been commonly conjectured that all massive >10 Msun stars are born in OB associations or clusters. Many O and B stars in the Galaxy or the Magellanic Clouds appear to exist…
Structure of Supergiant Shells in the Large Magellanic Cloud
Laura G. Book, You-Hua Chu, Robert A. Gruendl
Nine supergiant shells (SGSs) have been identified in the Large Magellanic Cloud (LMC) based on H-alpha images, and twenty-three SGSs have been reported based on HI 21-cm line obse…
Large-Scale Gravitational Instability and Star Formation in the Large Magellanic Cloud
Chao-Chin Yang, Robert A. Gruendl, You-Hua Chu +2
Large-scale star formation in disk galaxies is hypothesized to be driven by global gravitational instability. The observed gas surface density is commonly used to compute the stren…
A Debris Disk around the Central Star of the Helix Nebula?
Kate Y. L. Su, Y. -H. Chu, G. H. Rieke +6
Excess emission from a point-like source coincident with the central star of the Helix Nebula is detected with Spitzer at 8, 24, and 70 um. At 24 um, the central source is superpos…
Hard X-ray and Infrared Emission from Apparently Single White Dwarfs
Y. -H. Chu, R. A. Gruendl, M. A. Guerrero +1
The photospheric emission of a white dwarf (WD) is not expected to be detectable in hard X-rays or the mid-IR. Hard X-ray (~1 keV) emission associated with a WD is usually attribut…
X-ray Observations of the Bipolar PNe NGC 2346 and NGC 7026
Robert A. Gruendl, Martin A. Guerrero, You-Hua Chu +1
We have obtained X-ray observations of the bipolar planetary nebulae (PNe) NGC 2346 and NGC 7026 with XMM-Newton. These observations detected diffuse X-ray emission from NGC 7026 b…
X-ray Emitting Young Stars in the Carina Nebula
Kaushar Sanchawala, Wen-Ping Chen, Hsu-Tai Lee +5
We present a multiwavelength study of the central part of the Carina Nebula, including Trumpler 16 and part of Trumpler 14. Analysis of the Chandra X-ray Observatory archival data…
Resolving the nature of the Rosette HH1 jet facing strong UV dissipation
Jin Zeng Li, You-Hua Chu, Robert A. Gruendl +2
The Rosette HH1 jet is a collimated flow immersed in the strong UV radiation field of the Rosette Nebula. We investigate the physical properties of the Rosette HH1 jet using high-q…
The dissolving Rosette HH2 jet bathed in harsh UV radiation of the Rosette Nebula
J. Z. Li, Y. -H. Chu, R. A. Gruendl
Herbig-Haro flows discovered in photoionized medium forms a separate category and detailed studies of which become one of the key issues to our understanding of jet production and…
A Chandra/ACIS Study of 30 Doradus I. Superbubbles and Supernova Remnants
L. K. Townsley, P. S. Broos, E. D. Feigelson +4
We present an X-ray tour of diffuse emission in the 30 Doradus star-forming complex in the Large Magellanic Cloud using high-spatial-resolution X-ray images and spatially-resolved…
Chandra Observation of the Magellanic Cloud Supernova Remnant 0454-672 in N9
F. D. Seward, R. M. Williams, Y. -H. Chu +3
A Chandra observation has defined the extent of the SNR B 0454-692 in the LMC H II region N9. The remnant has dimension 2.3" x 3.6" and is elongated in the NS direction. The bright…
Protostars, Dust Globules, and a Herbig-Haro Object in the LMC Superbubble N51D
Y. -H. Chu, R. A. Gruendl, C. -H. R. Chen +9
Using Spitzer Space Telescope and Hubble Space Telescope observations of the superbubble N51D, we have identified three young stellar objects (YSOs) in dust globules, and made the…
Supernova Remnants in the Magellanic Clouds. VI. The DEML316 Supernova Remnants
R. M. Williams, Y. -H. Chu
The DEML316 system contains two shells, both with the characteristic signatures of supernova remnants (SNRs). We analyze Chandra and XMM-Newton data for DEML316, investigating its…
X-ray Emission from Wind Blown Bubbles. III. ASCA SIS Observations of NGC6888
M. Wrigge, Y. -H. Chu, E. A. Magnier +1
We present ASCA SIS observations of the wind-blown bubble NGC6888. Owing to the higher sensitivity of the SIS for higher energy photons compared to the ROSAT PSPC, we are able to d…
Parsec-scale X-ray Flows in High-mass Star-forming Regions
L. K. Townsley, P. S. Broos, E. D. Feigelson +1
The Chandra X-ray Observatory is providing remarkable new views of massive star-forming regions, revealing all stages in the life cycle of high-mass stars and their effects on thei…
A Neutral Hydrogen Survey of the Large Magellanic Cloud: Aperture Synthesis and Multibeam Data Combined
S. Kim, L. Staveley-Smith, M. A. Dopita +4
Using a Fourier-plane technique, we have merged HI ATCA and Parkes data sets providing an accurate set of images of the LMC sensitive to structure on scales of 15 pc (for an LMC di…
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…