{
  "id": "2004.13707",
  "version": "v1",
  "published": "2020-04-28T17:59:42.000Z",
  "updated": "2020-04-28T17:59:42.000Z",
  "title": "Three-dimensional analysis of the Minispiral at the Galactic Center: orbital parameters, periods and the mass of the black hole",
  "authors": [
    "Maria Selina Nitschai",
    "Nadine Neumayer",
    "Anja Feldmeier-Krause"
  ],
  "comment": "14 pages, 12 figures, 2 tables. Accepted for publication in ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "In this paper we simultaneously fit the orbits and line-of-sight velocities of the ionized gas around the supermassive black hole, Sagittarius A$^{\\ast}$ (Sgr A$^{\\ast}$), at the center of the Milky Way. The data we use are taken with the K-band Multi Object Spectrograph (KMOS), presented in Feldmeier-Krause et al. (2015) and cover the central $\\sim$ 2 pc of the Milky Way. From the brightest gas emission line in the K-band, the Br$\\gamma$ line, we derive the spatial distribution and line-of-sight velocities of the gas in the minispiral. Using the flux distribution and the line-of-sight velocity information, we perform a fit to the three main gas streamers in the minispiral, the Northern Arm, Eastern Arm, and Western Arc, using a Bayesian modelling method, and are able to reconstruct the three-dimensional orbits of these gas streamers. With the best fit orbital parameters and the measured line-of-sight velocities, we constrain the mass of Sgr A$^{\\ast}$. The orbit of the Eastern Arm is the one that is best constrained using our data. It gives a best-fit orbital period of $17.4_{-11.6}^{+31.0}\\cdot 10^3$ years and results in an enclosed mass of $14.9_{-10.4}^{+69.4}\\cdot 10^6 M_{\\odot}.$",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-04-28T17:59:42.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "black hole",
      "three-dimensional analysis",
      "galactic center",
      "line-of-sight velocity",
      "minispiral"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}