GRS 1758–258 with INTEGRAL and RXTE: Another Dim Soft State

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GRS_1758-258_with_integral_and_RXTE_Another_dim_so (1).pdf (307.51 KB)

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http://hdl.handle.net/11603/30027

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Physics Department

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https://orcid.org/0000-0002-4656-6881

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2005-12

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journal articles
preprints
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Abstract

The Galactic Center black hole candidate (BHC) GRS 1758-258 has been observed extensively within INTEGRAL'S Galactic Center Deep Exposure program in 2003 and 2004, while also being monitored with RXTE. We present quasi-simultaneous PCA, ISGRI, and SPI spectra from four GCDE observation epochs. During the first epoch GRS 1758-258 displayed another of its rare dim soft states like the one observed in 2001. In the recently emerging picture of the hardness-intensity evolution of black hole transient outbursts in which hard and soft states are observed to occur in a large overlapping range of luminosities (hysteresis), the dim soft state is not peculiar.