The Spreading Layer of GX 9+9

Details The Spreading Layer of GX 9+9 The Spreading Layer of GX 9+9

2007-05-11

arxiv.org/abs/0705.1621v1

Astronomy and Astrophysics

Astrophysics

4 pages (pdf), proceedings of the 6th INTEGRAL Workshop 'The Obscured Universe', July 2-8 2006, ESA SP-622

Scientific paper

The spreading layer (SL) on neutron star surface of GX 9+9 during the upper banana state was studied using INTEGRAL and RXTE observations. The SL-area becomes larger with increasing accretion rate while the SL-temperature remains close to the critical Eddington value, confirming predictions by Inogamov and Sunyaev (1999) and Suleimanov and Poutanen (2006). However, at low accretion rate the observed temperature is higher and SL-belt shallower than those predicted, requiring confirmation and theoretical explananation.

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