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

Dublin Core

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  <dc:creator>Kaneko, Yuki</dc:creator>
  <dc:creator>Gogus, Ersin</dc:creator>
  <dc:creator>Baring, Matthew G.</dc:creator>
  <dc:creator>Kouveliotou, Chryssa</dc:creator>
  <dc:creator>Lin, Lin</dc:creator>
  <dc:creator>Roberts, Oliver J.</dc:creator>
  <dc:creator>van der Horst, Alexander J.</dc:creator>
  <dc:creator>Younes, George</dc:creator>
  <dc:creator>Keskin, Ozge</dc:creator>
  <dc:creator>Coban, Omer Faruk</dc:creator>
  <dc:date>2021-01-01</dc:date>
  <dc:description>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.</dc:description>
  <dc:identifier>https://aperta.ulakbim.gov.trrecord/234468</dc:identifier>
  <dc:identifier>oai:aperta.ulakbim.gov.tr:234468</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:source>ASTROPHYSICAL JOURNAL LETTERS 916(1)</dc:source>
  <dc:title>Fermi/GBM Observations of the SGRJ1935+2154 Burst Forest</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
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