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X-WR-CALNAME:Erlangen Centre for Astroparticle Physics
X-ORIGINAL-URL:https://ecap.nat.fau.de
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DTSTART:20170326T010000
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DTSTART;TZID=Europe/Berlin:20170426T120000
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SUMMARY:Abigail Stevens - Comparing origins of low-frequency quasi-periodic oscillations with spectral timing
DESCRIPTION:The light curves of low-mass X-ray binaries show variability on timescales from milliseconds to months. The shorter (sub-second) variability is particularly interesting because it is thought to probe the inner region of the accretion disk and the central compact object. X-ray spectral-timing is a new type of analysis that seeks to investigate how matter behaves in the strong gravitational field around the compact object. Observations suggest that different types of low-frequency quasi-periodic oscillations (QPOs) are associated with different emitting-region geometries (e.g.\, disk-like or jet-like) in the innermost part of the X-ray binary\, that are varying possibly due to general relativistic precession. We developed a technique for phase-resolved spectroscopy of QPOs\, and are applying it to two types of low-frequency QPOs from the black hole X-ray binary GX 339-4. Over a QPO “period”\, we find that the energy spectrum changes not only in normalization\, but also in spectral shape. We can quantify how the spectral shape changes as a function of QPO phase\, and the two different QPOs show markedly different spectral changes. This talk will feature results from this paper\, as well as new preliminary results.
URL:https://ecap.nat.fau.de/index.php/event/seminar-2017-04-26-abigail-stevens/
LOCATION:ECAP\, room 307\, Erwin-Rommel-Str 1\, Erlangen\, 91058\, Germany
CATEGORIES:Seminar
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