Time-resolved imaging and spectral studies of an X-ray burst from the globular cluster Terzan

Details Time-resolved imaging and spectral studies of an X-ray burst from the globular cluster Terzan Time-resolved imaging and spectral studies of an X-ray burst from the globular cluster Terzan

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240l.121g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 240, Sept. 15, 1980, p. L121-L125.

Astronomy and Astrophysics

Astrophysics

100

Emission Spectra, Globular Clusters, Imaging Techniques, X Ray Imagery, X Ray Sources, Black Body Radiation, Spectrum Analysis, Time Response

Scientific paper

The first image of an X-ray burst was recorded with the HRI detector at the Einstein Observatory while observing the globular cluster Terzan 2. The burst was coincident with a persistent X-ray source located near the center of the cluster (thus confirming an earlier suggested identification) and reached a peak luminosity exceeding 5 x 10 to the 38th (d/10 kpc) squared. After a rapid rise to peak luminosity, a double-peaked spectral variation was observed over the next approximately 20 s with anticorrelated changes in the apparent emission region radius and temperature derived from blackbody (and modified blackbody) spectral fits. A shell or disk geometry, which undergoes adiabatic expansion and contraction, may be implied for the burst emission region. Alternatively, Comptonization is required. It is also shown that the peak burst luminosity must exceed the Eddington limit.

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