{
  "id": "1706.08662",
  "version": "v1",
  "published": "2017-06-27T03:36:36.000Z",
  "updated": "2017-06-27T03:36:36.000Z",
  "title": "First Detection of HC$_{5}$$^{15}$N in the Interstellar Medium",
  "authors": [
    "Kotomi Taniguchi",
    "Masao Saito"
  ],
  "comment": "Accepted by PASJ (Publications of the Astronomical Society of Japan) letter, 1 Figure, 2 Tables",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "We report the first detection of HC$_{5}$$^{15}$N with the $J=9-8$ rotational line from the cyanopolyyne peak in Taurus Molecular Cloud-1 (TMC-1 CP) using the 45-m radio telescope of the Nobeyama Radio Observatory. The column density of HC$_{5}$$^{15}$N is derived to be (1.9 +- 0.5)*$10^{11}$ cm$^{-2}$ (1 sigma). We apply the double isotope method to derive the $^{14}$N/$^{15}$N ratios of HC$_{5}$N and HC$_{3}$N in TMC-1 CP. The $^{14}$N/$^{15}$N ratios are calculated to be 344 +- 53 and 257 +- 54 for HC$_{5}$N and HC$_{3}$N, respectively. The $^{14}$N/$^{15}$N ratio of HC$_{5}$N is lower than the elemental ratio in the local interstellar medium (~440) and slightly higher than that of HC$_{3}$N in TMC-1 CP. Since HC$_{3}$N is formed via the neutral-neutral reaction between C$_{2}$H$_{2}$ and CN, the slightly higher $^{14}$N/$^{15}$N ratio of HC$_{5}$N may support our previous suggestions that the main formation mechanism of HC$_{5}$N is the ion-molecule reactions between hydrocarbon ions (C$_{5}$H$_{n}^{+}$) and nitrogen atoms.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-06-27T03:36:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "first detection",
      "interstellar medium",
      "nitrogen atoms"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}