Detection of Aql X-1 in Hard X-Ray State

Details Detection of Aql X-1 in Hard X-Ray State Detection of Aql X-1 in Hard X-Ray State

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004atel..259....1m&link_type=abstract

The Astronomer's Telegram, #259

Astronomy and Astrophysics

Astronomy

5

X-Ray, Gamma Ray, Request For Observations, Binaries, Neutron Stars, Transients

Scientific paper

We report a detection of Aql X-1 in the unusual hard spectral state. The source was significantly detected up to 150 keV with INTEGRAL on 24-25 March, 2004 during the Sagitarius Arm Tangent observations. Its spectrum can be described by a simple powerlaw with the photon index of ~2.1 and flux of ~35 mCrab in both 18-60 and 60-120 keV energy bands. We encourage the follow-up observations in different wavelengths.

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