Abstract
view Abstract Citations (114) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Discovery of a Prominent Cyclotron Absorption Feature from the Transient X-Ray Pulsar X0331+53 Makishima, K. ; Mihara, T. ; Ishida, M. ; Ohashi, T. ; Sakao, T. ; Tashiro, M. ; Tsuru, T. ; Kii, T. ; Makino, F. ; Murakami, T. ; Nagase, F. ; Tanaka, Y. ; Kunieda, H. ; Tawara, Y. ; Kitamoto, S. ; Miyamoto, S. ; Yoshida, A. ; Turner, M. J. L. Abstract A remarkable absorption feature at 28.5 keV, attributable to electron cyclotron resonance, has been discovered in the 1.9-60-keV X-ray spectrum of the recurrent transient X-ray pulsar X0331 + 53. The observed resonance energy implies a neutron star surface magnetic field of 2.5(1 + z) x 10 to the 12th G, where z is the gravitational redshift. The detection was made with the Ginga observatory in October 1989, during an outburst of this transient with a flux level of about 0.3 Crab. The feature is very deep and has been resolved with excellent statistics. This is the fourth unambiguous detection of cyclotron resonant scattering features from X-ray pulsars, suggesting that these features are a common phenomenon among these objects. An empirical relation found between the cyclotron resonance energy and the spectral cutoff energy suggests that the magnetic field strengths of the known X-ray pulsars are clustered in a range (1-4) x 10 to the 12th G. Publication: The Astrophysical Journal Pub Date: December 1990 DOI: 10.1086/185888 Bibcode: 1990ApJ...365L..59M Keywords: Absorption Spectra; Cyclotron Resonance; Pulsars; X Ray Sources; Neutron Stars; Red Shift; Stellar Magnetic Fields; Transient Response; X Ray Binaries; X Ray Spectra; Astrophysics; PULSARS; STARS: MAGNETIC; X-RAYS: BINARIES; X-RAYS: SPECTRA full text sources ADS | data products SIMBAD (7)
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