English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present an analysis of the high frequency timing properties of theApril-May 2000 outburst of the black hole candidate and Galactic microquasarXTE J1550-564, measured with the Rossi X-ray Timing Explorer. The rapid X-rayvariability we measure is consistent with the source being in either the ``veryhigh'' or ``intermediate'' black hole state. Strong (5-8% rms) quasi-periodicoscillations (QPOs) are found between 249-276 Hz; this represents the firstdetection of the same high frequency QPO in subsequent outbursts of a transientblack hole candidate. We also present evidence for lower-frequency QPOs atapproximately 188 Hz (3.5 sigma, single trial), also reported previously andlikely present simultaneously with the higher-frequency QPOs. We discuss thesefindings within the context of the 1998 outburst of XTE J1550-564, and commenton implications for models of QPOs, accretion flows, and black hole spin.Comment: 14 pages, 4 figures; minor changes from initial version; accepted for  publication in the Astrophysical Journa

High‐Frequency Quasi‐Periodic Oscillations in the 2000 Outburst of the Galactic Microquasar XTE J1550−564