A third X-ray spectral mode in Scorpius X-1 - Similarities to the other bright bulge sources

Details A third X-ray spectral mode in Scorpius X-1 - Similarities to the other bright bulge sources A third X-ray spectral mode in Scorpius X-1 - Similarities to the other bright bulge sources

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..843h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 15, 1989, p. 843-848. Research sponsored by DOE.

Astronomy and Astrophysics

Astrophysics

40

Galactic Bulge, Neutron Stars, Stellar Mass Accretion, X Ray Binaries, Color-Color Diagram, Exosat Satellite, Optical Thickness, Power Spectra, Spectral Bands, Stellar Oscillations

Scientific paper

Sco X-1 normally shows two spectral/quasi-periodic oscillation (QPO) modes. In this paper, new observations of Sco X-1 are reported which show it in a third mode which is similar to the 'horizontal branch' displayed by Cyg X-2 and suggests that the Galactic bulge sources follow a common, Z-shaped spectral pattern. In this mode, the spectral hardness remains constant, the intensity decreases, and the power spectrum shows a broad noise component at about 2 Hz. In all branches, Sco X-1 shows a previously unreported noise continuum which cuts off at about 60 Hz.

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