Possible transition of Aquila X-1 to a hard state seen with INTEGRAL

Astronomy and Astrophysics – Astronomy

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Radio, Millimeter, Infra-Red, X-Ray, Gamma Ray, Binaries, Neutron Stars, Transients

Scientific paper

Observations of the field around GRS 1915+105 with INTEGRAL performed from UT 2007 October 4 4:03:00 to 9:49:00 UTC, revealed the presence of a bright source whose position is consistent with the neutron star X- ray binary Aql X-1. The source is detected with IBIS/ISGRI at a significance of 7.9 sigma with a flux of ~23.2 mCrab between 20-40 keV. Although it was seen to undergo a bright outburst in soft X-rays since 2007 Sept.

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