Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-15
Astronomy and Astrophysics
Astrophysics
4 pages including 4 figures. Accepted for publication in ApJ Letters
Scientific paper
10.1086/340273
We report on a 25 ks observation of the 8.7 s anomalous X-ray pulsar 4U~0142+61 with the High Energy Transmission Grating Spectrometer (HETGS) on the Chandra X-ray Observatory. The continuum spectrum is consistent with previous measurements and is well fit by an absorbed power-law + blackbody with photon index Gamma=3.3+/-0.4 and kT=0.418+/-0.013 keV. 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 A (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 A (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. We find no strong features that are indicative of cyclotron absorption for magnetic field strengths of (1.9-9.8)x10^{14} G. This is still consistent with the dipole field strength of B=1.3x10^{14} G (at the polar cap) estimated from the pulsar's spindown.
Chakrabarty Deepto
Juett Adrienne M.
Marshall Herman L.
Schulz Norbert S.
No associations
LandOfFree
Chandra High-Resolution Spectrum of the Anomalous X-ray Pulsar 4U 0142+61 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chandra High-Resolution Spectrum of the Anomalous X-ray Pulsar 4U 0142+61, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chandra High-Resolution Spectrum of the Anomalous X-ray Pulsar 4U 0142+61 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-709866