SAS 3 observations of two X-ray transient events with precursors

Details SAS 3 observations of two X-ray transient events with precursors SAS 3 observations of two X-ray transient events with precursors

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221l..57h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 221, Apr. 15, 1978, p. L57-L62.

Astronomy and Astrophysics

Astronomy

51

Sas, X Ray Astronomy, X Ray Sources, Black Body Radiation, Bursts, Novae, Spectrum Analysis

Scientific paper

SAS 3 has observed two unusual fast transient X-ray events from different sources, one lasting about 150 s and one, approximately 1500 s. Both events were preceded by precursor pulses which lasted a few seconds and which rose and fell in less than 0.4 s. The precursors were separated from the 'main' events by several seconds, during which no X-rays were detected. There are similarities between the two main events and X-ray bursts in both their temporal and spectral evolution. The spectra of the main events started out much softer than the spectra of the precursors, became harder as they approached maximum intensity, and softened as they decayed. In the 1500-s event, X-rays with energies greater than 10 keV were delayed by about 80 s compared with 1.5-6-keV X-rays. A blackbody fit to the spectral data of the main event of approximately 1500-s duration gives a maximum temperature of 29 million K and a radius for the emitting region of at least about 9 km (at a distance of 10 kpc); this is similar to the temperature and sizes found for several X-ray burst sources.

Affiliated with

Also associated with

No associations

Rating

SAS 3 observations of two X-ray transient events with precursors does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with SAS 3 observations of two X-ray transient events with precursors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SAS 3 observations of two X-ray transient events with precursors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1379283