Ionized Gas in the First 10 kpc of the Interstellar Galactic Halo
arXiv:astro-ph/0211467 · doi:10.1086/346262
Abstract
We present FUSE observations of the post-asymptotic giant branch star von Zeipel 1128 (l=42.5, b=+78.7; z=10.0 kpc), located in the globular cluster Messier 3. The FUSE observations cover the wavelength range 905-1187 Ang at ~20 km/s (FWHM) resolution. These data exhibit many photospheric and interstellar absorption lines, including absorption from ions associated with the warm neutral, warm ionized, and highly-ionized phases of the interstellar medium along this sight line. Ionized hydrogen represents >12%, most likely ~45%, of the total hydrogen column along this sight line, most of it associated with the warm ionized phase. The warm ionized and neutral media toward von Zeipel 1128 have very similar gas-phase abundances and kinematics: the neutral and ionized gases in this region of the thick disk are closely related. Strong O VI absorption is seen with the same central velocity as the warm ionized gas, though the O VI velocity dispersion is much higher (sigma=32 km/s). Virtually all of the O VI is found at velocities where lower-ionization gas is seen, suggesting the O VI and WNM/WIM probes are tracing different portions of the same structures (e.g., the O VI may reside in interfaces surrounding the WNM/WIM clouds). We see no evidence for interstellar absorption associated with the globular cluster Messier 3 itself nor with the circumstellar environment of von Zeipel 1128. Neither high velocity cloud absorption (with v(LSR)>125 km/s) nor high velocity-dispersion gas (with sigma~60 km/s) is seen toward von Zeipel 1128. [Abridged]
arXiv commentAstrophysical Journal, in press; 39 pages, including 8 figures and 8 tables. Also available at http://kingpin.ucsd.edu/~howk/Papers/
References in corpus (20)
- Overview of the Far Ultraviolet Spectroscopic Explorer Mission
- On-Orbit Performance of the Far Ultraviolet Spectroscopic Explorer (FUSE) Satellite
- Distances and Metallicities of High- and Intermediate-Velocity Clouds
- WHAM Observations of H-Alpha, [S II], and [N II] toward the Orion and Perseus Arms: Probing the Physical Conditions of the Warm Ionized Medium
- Modeling the Warm Ionized Interstellar Medium and Its Impact on Elemental Abundance Studies
- The Abundance of Interstellar Nitrogen
- The Diffuse Interstellar Clouds toward 23 Orionis
- Detection of ionized gas in the globular cluster 47 Tucanae
- A Search for Extraplanar Dust in Nearby Edge-On Spirals
- On the Physical Origin of OVI Absorption-Line Systems
- IMAPS Observations of Interstellar Neutral Argon and the Implications for Partially Ionized Gas
- Discovery of a Population of HI Clouds in the Galactic Halo
- Hot Stars in Globular Cluster - A Spectroscopist's View
- Far Ultraviolet Spectroscopy of the Intergalactic and Interstellar Absorption Toward 3C 273
- Abundances and Physical Conditions in the Warm Neutral Medium Towards mu Columbae
- The Multiphase Halo of NGC 891: WIYN H-alpha and BVI Imaging
- Empirical Verification of the Fe II Oscillator Strengths in the FUSE Bandpass
- The Global Content, Distribution, and Kinematics of Interstellar O VI in the Large Magellanic Cloud
- Dust in the Ionized Medium of the Galaxy: GHRS Measurements of Al III and S III
- Interstellar Deuterium, Nitrogen, and Oxygen Abundances Toward BD +28 4211: Results from the Far Ultraviolet Spectroscopic Explorer
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- C II Radiative Cooling of the Diffuse Gas in the Milky Way
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