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An Optical Study of Stellar and Interstellar Environments of Seven Luminous and Ultraluminous X-Ray Sources
Caitlin J. Ramsey, Rosa M. Williams, Robert A. Gruendl +3
We have studied the stellar and interstellar environments of two luminous X-ray sources and five ultraluminous X-ray sources (ULXs) in order to gain insight into their nature. Arch…
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…
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…
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…
Diffuse X-Ray Emission from the Quiescent Superbubble M17, the Omega Nebula
B. C. Dunne, Y. -H. Chu, C. -H. R. Chen +5
The emission nebula M17 contains a young ~1 Myr-old open cluster; the winds from the OB stars of this cluster have blown a superbubble around the cluster. ROSAT observations of M17…
The Wind of the B[e] Supergiant Hen S22 Viewed through a Reflection Nebula in DEM L 106
Y. -H. Chu, C. -H. R. Chen, C. Danforth +5
Narrow-band HST WFPC2 images reveal a bow-shock-like halo around the HII region N30B toward the B[e] supergiant Hen S22 located within the larger DEM L 106 nebula in the Large Mage…
A Critical Examination of Hypernova Remnant Candidates in M101. II. NGC 5471B
C. -H. Rosie Chen, You-Hua Chu, Robert Gruendl +2
NGC 5471B has been suggested to contain a hypernova remnant because of its extraordinarily bright X-ray emission. To assess its true nature, we have obtained high-resolution images…
Interstellar Bubbles in Two Young HII Regions
Yael Naze, You-Hua Chu, Sean D. Points +3
Massive stars are expected to produce wind-blown bubbles in the interstellar medium; however, ring nebulae, suggesting the existence of bubbles, are rarely seen around main-sequenc…
Resolving SNR 0540-6944 from LMC X-1 with Chandra
Rosa Murphy Williams, Robert Petre, You-Hua Chu +1
We examine the supernova remnant (SNR) 0540-697 in the Large Magellanic Cloud (LMC) using data from the Chandra ACIS. The X-ray emission from this SNR had previously been hidden in…
Super-luminous Supernova Remnants
You-Hua Chu, C. -H. Rosie Chen, Shih-Ping Lai
Some extragalactic SNRs are more than two orders of magnitude more luminous than the young Galactic SNR Cas A. These SNRs are called super-luminous or ultra-luminous SNRs. Their hi…