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        "id": [
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        "updated": [
          "2019-05-16T17:55:02Z"
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        "published": [
          "2019-05-16T17:55:02Z"
        ],
        "title": [
          "Electron Densities and Nitrogen Abundances in Ionized Gas Derived Using [NII] Fine-structure and Hydrogen Recombination lines"
        ],
        "summary": [
          "We present a method for deriving the electron density of ionized gas using\nthe ratio of the intensity of the [NII] 205um line to that of a Hydrogen radio\nrecombination line (RRL). We use this method to derive electron densities of 21\nvelocity components in 11 lines of sight, including the Galactic center. We\nobserved, at high--spectral resolution, the [NII] 205um with the Herschel/HIFI\nand SOFIA/GREAT instruments and the radio recombination lines with the Green\nBank Telescope and the NASA Deep Space Network Deep Space Station 43 (DSS-43)\ntelescope. We find typical electron densities between 6 to 170 cm^{-3}, which\nare consistent with those derived at low spectral resolution using the [NII]\n205um/122um ratio with Herschel/PACS on a larger sample of sight lines in the\nGalactic plane. By matching the electron densities derived from the [NII]\n205um/RRL intensity ratio and the [NII] 122um/205um intensity ratio, we derive\nthe nitrogen fractional abundance for our velocity components. We investigate\nthe dependence of the N/H ratio with Galactocentric distance in the inner\nGalaxy (R_gal<6kpc), which is inaccessible in optical studies due to dust\nextinction. We find that the distribution of nitrogen abundances in the inner\ngalaxy derived from our data has a slope that is consistent to that found in\nthe outer Galaxy in optical studies. This result is inconsistent with some\nsuggestions of a flatter distribution of the nitrogen abundance in the inner\ngalaxy."
        ],
        "author": [
          {
            "name": [
              "Jorge L. Pineda"
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          {
            "name": [
              "Shinji Horiuchi"
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            "name": [
              "L. D. Anderson"
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              {
                "_": "Department of Physics and Astronomy, West Virginia University",
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                "_": "USA Center for Gravitational Waves and Cosmology, West Virginia University",
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                "_": "USA Center for Gravitational Waves and Cosmology, West Virginia University",
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            "name": [
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            "_": "18 pages, 9 figures, to be submitted to ApJ, comments welcome",
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