Discovery of a prominent cyclotron absorption feature from the transient X-ray pulsar X0331 + 53

Details Discovery of a prominent cyclotron absorption feature from the transient X-ray pulsar X0331 + 53 Discovery of a prominent cyclotron absorption feature from the transient X-ray pulsar X0331 + 53

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365l..59m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. L59-L62.

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Absorption Spectra, Cyclotron Resonance, Pulsars, X Ray Sources, Neutron Stars, Red Shift, Stellar Magnetic Fields, Transient Response, X Ray Binaries, X Ray Spectra

Scientific paper

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.

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