Session BO4: Laser Plasma Pulse Compression/Laboratory Astrophysics

9:45 AM–12:21 PM, Monday, November 17, 2008
Room: Reunion B

Chair: Ilya Dodin, Princeton University

Abstract ID: BAPS.2008.DPP.BO4.9

Abstract: BO4.00009 : Laboratory simulation of photoionized plasma among astronomical compact objects

11:21 AM–11:33 AM

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Authors:

  Shinsuke Fujioka
  Norimasa Yamamoto
    (Osaka University)

  Feilu Wang
    (Chinese Academy of Sciences)

  David Salzmann
    (Osaka University)

  Yutong Li
    (Chinese Academy of Sciences)

  Yong-Joo Rhee
    (Korea Atomic Energy Research Institute)

  Hiroaki Nishimura
    (Osaka University)

  Hideaki Takabe
    (Osaka University)

  Kunioki Mima
    (Osaka University)

X-ray line emission with several-keV of photon energy was observed from photoionized accreting clouds, for example CYGNUS X-3 and VELA X-1, those are exposed by hard x-ray continuum from the compact objects, such as neutron stars, black holes, or white dwarfs, although accreting clouds are thermally cold. The x-ray continuum-induced line emission gives a good insight to the accreting clouds. We will present a novel laboratory simulation of the photoionized plasma under well-characterized conditions by using high-power laser facility. Blackbody radiator with 500-eV of temperature, as a miniature of a hot compact object, was created.Silicon (Si) plasma with 30-eV of electron temperature was produced in the vicinity of the 0.5-keV blackbody radiator. Line emissions of lithium- and helium-like Si ions was clearly observed around 2-keV of photon-energy from the thermally cold Si plasma, this result is hardly interpreted without consideration of the photoionization. Atomic kinetics code reveals importance of inner-shell ionization directly caused by incoming hard x-rays.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DPP.BO4.9