{
  "id": "1807.07599",
  "version": "v1",
  "published": "2018-07-19T18:37:30.000Z",
  "updated": "2018-07-19T18:37:30.000Z",
  "title": "Multiwavelength Light Curves of Two Remarkable Sagittarius A* Flares",
  "authors": [
    "G. G. Fazio",
    "J. L. Hora",
    "G. Witzel",
    "S. P. Willner",
    "M. L. N. Ashby",
    "F. Baganoff",
    "E. Becklin",
    "S. Carey",
    "D. Haggard",
    "C. Gammie",
    "A. Ghez",
    "M. A. Gurwell",
    "J. Ingalls",
    "D. Marrone",
    "M. R. Morris",
    "H. A. Smith"
  ],
  "comment": "9 pages, 3 figures, to appear in the Astrophysical Journal",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Sgr A*, the supermassive black hole (SMBH) at the center of our Milky Way Galaxy, is known to be a variable source of X-ray, near-infrared (NIR), and submillimeter (submm) radiation and therefore a prime candidate to study the electromagnetic radiation generated by mass accretion flow onto a black hole and/or a related jet. Disentangling the power source and emission mechanisms of this variability is a central challenge to our understanding of accretion flows around SMBHs. Simultaneous multiwavelength observations of the flux variations and their time correlations can play an important role in obtaining a better understanding of possible emission mechanisms and their origin. This paper presents observations of two flares that both apparently violate the previously established patterns in the relative timing of submm/NIR/X-ray flares from Sgr A*. One of these events provides the first evidence of coeval structure between NIR and submm flux increases, while the second event is the first example of the sequence of submm/X-ray/NIR flux increases all occurring within ~1 hr. Each of these two events appears to upend assumptions that have been the basis of some analytic models of flaring in Sgr A*. However, it cannot be ruled out that these events, even though unusual, were just coincidental. These observations demonstrate that we do not fully understand the origin of the multiwavelength variability of Sgr A*, and show that there is a continued and important need for long-term, coordinated, and precise multiwavelength observations of Sgr A* to characterize the full range of variability behavior.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-07-19T18:37:30.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "multiwavelength light curves",
      "black hole",
      "sagittarius",
      "emission mechanisms",
      "precise multiwavelength observations"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}