Towards an Understanding of the Isolated Neutron Star RX J1856.5-3754 Wynn Ho Kavli Institute for Particle Astrophysics and Cosmology Stanford University.

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Presentation transcript:

Towards an Understanding of the Isolated Neutron Star RX J Wynn Ho Kavli Institute for Particle Astrophysics and Cosmology Stanford University 2005 Hubble Fellows Symposium – 7-8 April 2005

Physics from Neutron Star Surface Emission (Yakovlev & Pethick 2004) Equation of state Thermal evolution Surface composition Magnetic field

Lattimer & Prakash 2004, Courtesy of Page () Neutron Star Surface Emission Atmosphere scale height H  1 cm << R Emission is anisotropic and polarized in magnetic field Vacuum polarization important at B > B Q = m e 2 c 3 /e ℏ = 4.4  G Atoms bound by magnetic field

RX J (Burwitz et al. 2003) Thermal emission No spectral features BB underpredicts optical by 7 Atmosphere overpredicts by >> 1 Two blackbodies kT=63 eV, R=4.4 km kT=26 eV, R=18.2 km No X-ray pulsations (1.3% limit)

RX J Model Spectra/ Observations

RX J (Burwitz et al. 2003) Thermal emission No spectral features BB underpredicts optical by 7 Atmosphere overpredicts by >> 1 Two blackbodies kT=63 eV, R=4.4 km kT=26 eV, R=18.2 km No X-ray pulsations (1.3% limit)

RX J Model Spectra/ Observations

Thin Atmospheres

Condensed Iron Surface Emission 10 5

Condensed Iron Surface Emission 10 5

RX J Model Spectra/ Observations

Collaborators David L. Kaplan (Massachusetts Institute of Technology) Philip Chang (University of California, Santa Barbara) Matthew van Adelsberg and Dong Lai (Cornell University) Alexander Y. Potekhin (Ioffe Physico-Technical Institute) Gilles Chabrier (Ecole Normale Superieure de Lyon, CRAL)

RX J Effect of Redshift

Dim Isolated Neutron Stars Radio-quiet F X-ray / F optical > 10 3 Optical excess Blackbody fit to X-ray spectra kT BB  85 eV, R BB  6 km DINSPeriod (s)PFT (eV)E line (keV)EW (keV) RX J % RX J ?< 3-5 % RX J % RX J or % RX J %85* RX J % (XMM-van Kerkwijk 2003)

RX J T (eV)χ 2 / dofE (eV)σ (eV)τ blackbody blackbody+line blackbody+edge H atm (B=0 G) H atm (B=10 12 G) H atm (B=10 13 G) (XMM-Zane et al. 2005) line or edge?