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XMM-Newton observation of the anomalous X-ray pulsar 4U 0142+61
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Göhler, E., Wilms, J. (Joern) and Staubert, R. (2005) XMM-Newton observation of the anomalous X-ray pulsar 4U 0142+61. Astronomy & Astrophysics, Vol.433 (No.3). pp. 1079-1083. doi:10.1051/0004-6361:20042101 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:20042101
Abstract
We present results of an observation of the anomalous X-ray pulsar 4U 0142+61 with the EPIC cameras on XMM-Newton performed on 2003 January 24. The pulse phase averaged spectrum can be best described by the sum of a black body with a temperature of kTBB = 0.395(5) keV and a power law with photon index Γ = 3.62(5). The unabsorbed 2−10 keV flux is ∼7.2 × 10−11 erg s−1 cm−2. No evidence for additional spectral features such as cyclotron lines is present.
These results are consistent with those from an earlier Chandra observation in 2001 May. Phase resolved spectroscopy over the 8.6882(2) s period (MJD 52 663.93) shows clear variations with pulse phase of Γ, while kTBB shows a small variation of ∼12%. We confirm earlier conclusions by Özel (2001, ApJ, 563, 276) that the emission from AXPs is more likely to originate from neutron stars with one single and magnetically active region on the neutron star. The significantly different behavior of the
soft and hard spectral components with pulse phase, however, cannot be fully reconciled with the present magnetar emission models.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | X-ray sources, Galactic, Pulsars, Neutron stars, Stars -- Magnetic fields | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | April 2005 | ||||
Dates: |
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Volume: | Vol.433 | ||||
Number: | No.3 | ||||
Page Range: | pp. 1079-1083 | ||||
DOI: | 10.1051/0004-6361:20042101 | ||||
Status: | Not Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR), European Space Agency (ESA), United States. National Aeronautics and Space Administration (NASA) | ||||
Grant number: | 50 OX 0002 (DLR), 50 OG 9601 (DLR) |
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