Chandra/HETGS Spectroscopy of the Anomalous X-ray Pulsar 4U 0142+61

Details Chandra/HETGS Spectroscopy of the Anomalous X-ray Pulsar 4U 0142+61 Chandra/HETGS Spectroscopy of the Anomalous X-ray Pulsar 4U 0142+61

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.s7004j&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We report on a 25 ks Chandra/HETGS observation of the 8.7 s anomalous X-ray pulsar 4U 0142+61. The continuum spectrum is consistent with previous measurements and is well fit by an absorbed power-law + blackbody. The pulsed fraction was between 8.7% and 21%, also consistent with past measurements. No evidence was found for emission or absorption lines, with an upper limit of 50 eV on the equivalent width of broad features in the 2.5--13 Å (0.95--5.0 keV) range and an upper limit of 10 eV on the equivalent width of narrow features in the 4.1--17.7 Å (0.7--3.0 keV) range. If the source is a magnetar, then the absence of a proton cyclotron line strongly constrains magnetar atmosphere models and hence the magnetic field strength of the neutron star. For the energy range given above, the disallowed magnetic field strengths of 4U 0142+61 are (1.9--9.8)× 10^14 G. This is still consistent with the dipole field strength of B=1.3× 10^14 G (at the polar cap) estimated from the pulsar's spindown. We will also present the results of pulse-phase-resolved spectroscopy of these data.

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