Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...350..847f&link_type=abstract
Astronomy and Astrophysics, v.350, p.847-851 (1999)
Astronomy and Astrophysics
Astrophysics
1
X-Rays: Stars, Stars: Binaries: General, Stars: Pulsars: General, Galaxy: Globular Clusters: Individual: 47 Tuc
Scientific paper
Recent X-/gamma -ray observations with the Rossi X-ray Timing Explorer (RXTE) of 47 Tuc (NGC 104) are used to compare different models of millisecond pulsar emission. Data from both the Proportional Counter Array and the High Energy X-ray Timing Experiment are presented, covering a total energy range of 2-250 keV. A new upper limit on the hard X-/gamma -ray emission from 47 Tuc is set, suggesting that the isolated millisecond pulsars may be non-emitting or very weak X-ray sources. The current binary X-ray emission theory is consistent with this result with some modification. Timing analysis reveals no periodic pulsations in the data, further suggesting that isolated millisecond pulsars are very weak X-ray emitters.
Bird Andrew J.
Dean Anthony J.
Ferguson Chantal
Lei Fengchun
Lockley J. J.
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