Discovery of Microsecond Soft Lags in the X-Ray Emission of the Atoll Source 4U1636-536

Details Discovery of Microsecond Soft Lags in the X-Ray Emission of the Atoll Source 4U1636-536 Discovery of Microsecond Soft Lags in the X-Ray Emission of the Atoll Source 4U1636-536

1999-01-25

arxiv.org/abs/astro-ph/9901349v1

Astronomy and Astrophysics

Astrophysics

Accepted to the Astrophysical Journal Letters, 4 pages

Scientific paper

10.1086/311941

Exploiting the presence of kilohertz quasi-periodic oscillations (QPOs) in the timing power spectrum, we find that the soft x-ray emission of the neutron-star X-ray binary and atoll source 4U1636-536 modulated at the QPO frequency lags behind that of the hard x-ray emission. Emission in the 3.8-6.4 keV band is delayed by 25.0 +/- 3.3 microseconds relative to the 9.3-69 keV band. The delay increases in magnitude with increasing energy. Our results are consistent with those of Vaughan et al. (1997), when the sign is corrected (Vaughan et al. 1998), for the atoll source 4U1608-52. The soft lag could be produced by Comptonization of hard photons injected into a cooler electron cloud or by intrinsic spectral softening of the emission during each oscillation cycle.

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