Evidence for coherent emission with a 12 millisecond period during a burst from MXB 1728-34

Details Evidence for coherent emission with a 12 millisecond period during a burst from MXB 1728-34 Evidence for coherent emission with a 12 millisecond period during a burst from MXB 1728-34

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..214s&link_type=abstract

Astrophysical Journal, Part 1, vol. 257, June 1, 1982, p. 214-224.

Astronomy and Astrophysics

Astronomy

25

Bursts, Coherent Radiation, Emission Spectra, Kepler Laws, Stellar Mass Accretion, X Ray Spectra, Black Holes (Astronomy), Fourier Analysis, Heao 1, Neutron Stars, Periodic Variations, Random Signals, Temporal Resolution, X Ray Astronomy

Scientific paper

Four bursts of MXB 1728-34 have been observed with the HEAO A-1 instrument using 5-ms timing resolution. The rapid initial rise has been resolved in all four bursts. Fourier analysis indicates the presence of a periodic component with a 12.2-ms period during one of the bursts. Epoch-folding analysis confirms this period and further indicates that the period decreases with time, with dP/dt = -10 to the -6th. The signal has a probability of 2.5 x 10 to the -9th to occur at random, and an expectation of 0.003 to occur in the number of epoch foldings performed. Attempts to explain the 12-ms period as a neutron star spin period meet with severe difficulties. The observed periodic emission is most likely associated with the Kepler orbital period in a viscous accretion disk surrounding a black hole of about 10 solar masses.

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