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

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/234468</identifier>
  <creators>
    <creator>
      <creatorName>Kaneko, Yuki</creatorName>
      <givenName>Yuki</givenName>
      <familyName>Kaneko</familyName>
      <affiliation>Sabanci Univ, Fac Engn &amp; Nat Sci, TR-34956 Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Gogus, Ersin</creatorName>
      <givenName>Ersin</givenName>
      <familyName>Gogus</familyName>
      <affiliation>Sabanci Univ, Fac Engn &amp; Nat Sci, TR-34956 Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Baring, Matthew G.</creatorName>
      <givenName>Matthew G.</givenName>
      <familyName>Baring</familyName>
      <affiliation>Rice Univ, Dept Phys &amp; Astron, MS 108,6100 Main St, Houston, TX 77251 USA</affiliation>
    </creator>
    <creator>
      <creatorName>Kouveliotou, Chryssa</creatorName>
      <givenName>Chryssa</givenName>
      <familyName>Kouveliotou</familyName>
    </creator>
    <creator>
      <creatorName>Lin, Lin</creatorName>
      <givenName>Lin</givenName>
      <familyName>Lin</familyName>
      <affiliation>Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China</affiliation>
    </creator>
    <creator>
      <creatorName>Roberts, Oliver J.</creatorName>
      <givenName>Oliver J.</givenName>
      <familyName>Roberts</familyName>
      <affiliation>Univ Space &amp; Res Assoc, Sci &amp; Technol Inst, 320 Sparkman Dr, Huntsville, AL 35805 USA</affiliation>
    </creator>
    <creator>
      <creatorName>van der Horst, Alexander J.</creatorName>
      <givenName>Alexander J.</givenName>
      <familyName>van der Horst</familyName>
    </creator>
    <creator>
      <creatorName>Younes, George</creatorName>
      <givenName>George</givenName>
      <familyName>Younes</familyName>
    </creator>
    <creator>
      <creatorName>Keskin, Ozge</creatorName>
      <givenName>Ozge</givenName>
      <familyName>Keskin</familyName>
      <affiliation>Sabanci Univ, Fac Engn &amp; Nat Sci, TR-34956 Istanbul, Turkey</affiliation>
    </creator>
    <creator>
      <creatorName>Coban, Omer Faruk</creatorName>
      <givenName>Omer Faruk</givenName>
      <familyName>Coban</familyName>
      <affiliation>Sabanci Univ, Fac Engn &amp; Nat Sci, TR-34956 Istanbul, Turkey</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Fermi/Gbm Observations Of The Sgrj1935+2154 Burst Forest</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2021</publicationYear>
  <dates>
    <date dateType="Issued">2021-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/234468</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.3847/2041-8213/ac0fe7</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="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.</description>
  </descriptions>
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