1 Ocak 2021 Dergi makalesi Açık Erişim

Kaneko, Yuki; Gogus, Ersin; Baring, Matthew G.; Kouveliotou, Chryssa; Lin, Lin; Roberts, Oliver J.; van der Horst, Alexander J.; Younes, George; Keskin, Ozge; Coban, Omer Faruk

Citation Style Language JSON

{
  "DOI": "10.3847/2041-8213/ac0fe7", 
  "abstract": "During 2020 April and May, SGR J1935+2154 emitted hundreds of short bursts and became one of the most prolific transient magnetars. At the onset of the active bursting period, a 130 s burst \"forest,\" which included some bursts with peculiar time profiles, were observed with the Fermi/Gamma-ray Burst Monitor (GBM). In this Letter, we present the results of time-resolved spectral analysis of this burst \"forest\" episode, which occurred on 2020 April 27. We identify thermal spectral components prevalent during the entire 130 s episode; high-energy maxima appear during the photon flux peaks, which are modulated by the spin period of the source. Moreover, the evolution of the nu F (nu) spectral hardness (represented by E (peak) or blackbody temperature) within the lightcurve peaks is anti-correlated with the pulse phases extrapolated from the pulsation observed within the persistent soft X-ray emission of the source six hours later. Throughout the episode, the emitting area of the high-energy (hotter) component is 1-2 orders of magnitude smaller than that for the low-energy component. We interpret this with a geometrical viewing angle scenario, inferring that the high-energy component likely originates from a low-altitude hotspot located within closed toroidal magnetic field lines.", 
  "author": [
    {
      "family": "Kaneko", 
      "given": " Yuki"
    }, 
    {
      "family": "Gogus", 
      "given": " Ersin"
    }, 
    {
      "family": "Baring", 
      "given": " Matthew G."
    }, 
    {
      "family": "Kouveliotou", 
      "given": " Chryssa"
    }, 
    {
      "family": "Lin", 
      "given": " Lin"
    }, 
    {
      "family": "Roberts", 
      "given": " Oliver J."
    }, 
    {
      "family": "van der Horst", 
      "given": " Alexander J."
    }, 
    {
      "family": "Younes", 
      "given": " George"
    }, 
    {
      "family": "Keskin", 
      "given": " Ozge"
    }, 
    {
      "family": "Coban", 
      "given": " Omer Faruk"
    }
  ], 
  "container_title": "ASTROPHYSICAL JOURNAL LETTERS", 
  "id": "234468", 
  "issue": "1", 
  "issued": {
    "date-parts": [
      [
        2021, 
        1, 
        1
      ]
    ]
  }, 
  "title": "Fermi/GBM Observations of the SGRJ1935+2154 Burst Forest", 
  "type": "article-journal", 
  "volume": "916"
}