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Title:
A Strong, Broad Absorption Feature in the X-Ray Spectrum of the Nearby Neutron Star RX J1605.3+3249
Authors:
van Kerkwijk, M. H.; Kaplan, D. L.; Durant, M.; Kulkarni, S. R.; Paerels, F.
Affiliation:
AA(Department of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada; , .), AB(Department of Astronomy, California Institute of Technology, m.s. 105-24, Pasadena, CA 91125; , .), AC(Department of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada; , .), AD(Department of Astronomy, California Institute of Technology, m.s. 105-24, Pasadena, CA 91125; , .), AE(Columbia Astrophysics Laboratory and Department of Astronomy, Columbia University, 538 West 120th Street, New York, NY 10027; .)
Publication:
The Astrophysical Journal, Volume 608, Issue 1, pp. 432-443. (ApJ Homepage)
Publication Date:
06/2004
Origin:
UCP
ApJ Keywords:
Stars: Neutron, X-Rays: Individual: Alphanumeric: RX J1605.3+3249, X-Rays: Stars
DOI:
10.1086/386299
Bibliographic Code:
2004ApJ...608..432V

Abstract

We present X-ray spectra taken with XMM-Newton of RX J1605.3+3249, the third brightest in the class of nearby thermally emitting neutron stars. In contrast to what is the case for the brightest object, RX J1856.5-3754, we find that the spectrum of RX J1605.3+3249 cannot be described well by a pure blackbody, but shows a broad absorption feature at 27 Å (0.45 keV). With this, it joins the handful of isolated neutron stars for which spectral features arising from the surface have been detected. We discuss possible mechanisms that might lead to the features, as well as the overall optical to X-ray spectral energy distribution, and compare the spectrum with what is observed for the other nearby thermally emitting neutron stars. We conclude that we may be observing absorption due to the proton cyclotron line, as was suggested for the other sources, but weakened because of the strong-field quantum electrodynamics effect of vacuum resonance mode conversion.
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