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26 April 2024 |
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Optical Spectroscopy of GX339-4 during the High-Soft and Low-Hard States II: Line Ionisation and Emission Region | | Kinwah Wu
; Roberto Soria
; Richard W. Hunstead
; Helen M. Johnston
; | | Date: |
1 Aug 2000 | | Journal: | Mon.Not.Roy.Astron.Soc. 320 (2001) 177 | | Subject: | astro-ph | | Abstract: | We have carried out observations of the X-ray transient GX339-4 during its high-soft and low-hard X-ray spectral states. Our high-resolution spectroscopic observation in 1999 April suggests that the H-alpha line has a single-peaked profile in the low-hard state as speculated in our previous paper. The HeII 4686 line, however, has a double-peaked profile in both the high-soft and low-hard states. This suggests that the line-emission mechanism is different in the two states. Our interpretation is that double-peaked lines are emitted from a temperature-inversion layer on the accretion-disk surface when it is irradiatively heated by soft X-rays. Single-peaked lines may be emitted from outflow/wind matter driven by hard X-ray heating. We have constructed a simple plane-parallel model and we use it to illustrate that a temperature-inversion layer can be formed at the disk surface under X-ray illumination. We also discuss the conditions required for the formation of temperature inversion and line emission. Based on the velocity separations measured for the double-peaked lines in the high-soft state, we propose that GX339-4 is a low-inclination binary system. The orbital inclination is about 15 deg if the orbital period is 14.8 hours. | | Source: | arXiv, astro-ph/0008016 | | Services: | Forum | Review | PDF | Favorites | |
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