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Journal article

Discovery of millihertz ultraviolet quasi-periodic oscillations in Hercules X-1

Abstract:

Observations of the ultraviolet continuum of the X-ray binary system Her X-1/HZ Herculis with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope (HST) show quasi-periodic oscillations (QPOs) at frequencies of 8 ± 2 and 43 ± 2 mHz, with rms amplitudes of 2% and 4% of the steady flux. Observations with the Keck Telescope confirm the presence of the higher frequency QPO in the optical continuum, with a rms amplitude of 1.6% ± 0.2%. The QPOs are most prominent in the HST data ...

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Publication status:
Published

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Publisher copy:
10.1086/317786

Authors


Boroson, B More by this author
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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Astrophysics
Kallman, T More by this author
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Publisher:
Institute of Physics Publishing
Journal:
ASTROPHYSICAL JOURNAL
Volume:
545
Issue:
1
Pages:
399-406
Publication date:
2000-12-10
DOI:
EISSN:
1538-4357
ISSN:
0004-637X
URN:
uuid:6158c9da-2275-44b4-ab90-63b1022821ba
Source identifiers:
362000
Local pid:
pubs:362000

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