Discovery of a Cyclotron Line in the Spectrum of 4U 0352+309 (X Per)

Details Discovery of a Cyclotron Line in the Spectrum of 4U 0352+309 (X Per) Discovery of a Cyclotron Line in the Spectrum of 4U 0352+309 (X Per)

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.2208c&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #22.08; Bulletin of the American Astronomical Society, Vol. 32, p.1214

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the discovery of a ~30 keV Cyclotron Resonance Scattering Feature (CRSF) in the X-ray spectrum of 4U 0352+309 (X Per). This is the result of a broad band spectral analysis using observations taken with the Rossi X-Ray Timing Explorer. 4U 0352+309 is a persistent low luminosity (LX = 4.2*E34} {ergs s{-1}) X-ray pulsar, with a 837 s period and which accretes material from the Be star X Per. The X-Ray spectrum, unique among accreting pulsars, may be due to the low mass accretion rate and could be typical of the new class of persistent low luminosity Be/X-Ray binary pulsars. We attempted spectral fits with continuum models used historically for 4U 0352+309, and found that all were improved by the addition of a CRSF at ~30 keV. The simplest, most physically reasonable model that fit the observations is a combination of a 1.45+/-0.02 keV blackbody with a 5.4*E8} {cm}{2 area, and an unbroken power-law with a 1.83+/-0.03 photon index modified by the CRSF. In these fits the CRSF energy is 28.6-1.7+1.5 keV, implying a magnetic field strength of 2.5(1+z)*E12 G in the scattering region (where z is the gravitational redshift). Phase resolved analysis shows that the blackbody and cyclotron line energies are consistent with being constant through the pulse.

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