The X-ray Spectrum of SAX J1808.4-3658

Details The X-ray Spectrum of SAX J1808.4-3658 The X-ray Spectrum of SAX J1808.4-3658

1998-05-29

arxiv.org/abs/astro-ph/9805372v2

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astrophysical Journal Letters. 12 pages, 3 figures

Scientific paper

10.1086/311629

We report on the X-ray spectrum of the 401 Hz X-ray pulsar and type I burst source SAX J1808.4-3658, during its 1998 April/May hard outburst. The observations were made with RXTE over a period of three weeks. The spectrum is well-described by a power law with photon index 1.86+/-0.01 that is exponentially cut off at high energies. Excess soft emission above the power law is present as well as a weak Fe-K line. This is the first truly simultaneous broad-band (2.5-250 keV) spectrum of a type I burst source in the hard state. The spectrum is consistent with other hard state burster spectra which cover either only the soft (1-20 keV) or hard (>20 keV) bands, or cover both, but not simultaneously. The cut-off power law resembles black hole candidates (BHCs) in their low states, observed with RXTE. We compare the SAX J1808.4-3658 spectrum to three BHCs and find that the power law is somewhat softer. This suggests that the photon index may provide a way to distinguish between low state emission from Galactic black holes and type I bursters.

Affiliated with

Also associated with

No associations

Rating

The X-ray Spectrum of SAX J1808.4-3658 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 The X-ray Spectrum of SAX J1808.4-3658, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The X-ray Spectrum of SAX J1808.4-3658 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-593636