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Award ID contains: 1714472

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  1. ; ; (, Science Advances)
    null (Ed.)
    Optical emission lines are used to categorize galaxies into three groups according to their dominant central radiation source: active galactic nuclei, star formation, or low-ionization (nuclear) emission regions [LI(N)ERs] that may trace ionizing radiation from older stellar populations. Using the Wisconsin H-Alpha Mapper, we detect optical line emission in low-extinction windows within eight degrees of Galactic Center. The emission is associated with the 1.5-kiloparsec-radius “Tilted Disk” of neutral gas. We modify a model of this disk and find that the hydrogen gas observed is at least 48% ionized. The ratio [NII] λ6584 angstroms/Hα λ6563 angstroms increases from 0.3 to 2.5 with Galactocentric radius; [OIII] λ5007 angstroms and Hβ λ4861 angstroms are also sometimes detected. The line ratios for most Tilted Disk sightlines are characteristic of LI(N)ER galaxies. 
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  2. ; ; (, The Astrophysical Journal)
    null (Ed.)
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  3. ; ; ; ; (, The Astrophysical Journal)
    null (Ed.)
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  4. ; ; ; ; (, Monthly Notices of the Royal Astronomical Society)
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  5. ; ; ; ; ; ; ; ; ; ; et al (, The Astrophysical Journal)
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  6. ; ; ; ; (, Journal of Geophysical Research: Space Physics)
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