Recent Integral Observations Of The Galactic Center Region: The Black Hole X-ray Binary Grs 1758-258 And The Enigmatic X-ray Binary 4u 1700-377

Details Recent Integral Observations Of The Galactic Center Region: The Black Hole X-ray Binary Grs 1758-258 And The Enigmatic X-ray Binary 4u 1700-377 Recent Integral Observations Of The Galactic Center Region: The Black Hole X-ray Binary Grs 1758-258 And The Enigmatic X-ray Binary 4u 1700-377

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915301m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #153.01

Astronomy and Astrophysics

Astronomy

Scientific paper

We present preliminary results of X-ray monitoring observations of the Galactic Center region measured between 2009 and 2011 with the INTEGRAL satellite. Our first goal was to search for new transient sources in the field. A sensitive search, averaging over three-day datasets, yielded no new source detections in the 20-40 keV range. Also, we present results from the Swift-BAT and INTEGRAL-ISGRI instruments of two X-ray binary systems that fall among the least understood: the persistent black hole candidate GRS1758-258 and the pulsar candidate 4U1700-377. GRS1758-258 shows large long-term flux variations with very rare soft-state events. We find that the INTEGRAL-ISGRI spectra of this source do not allow to detect significant variation on a timescale of days. We confirmed that the spectral shape is generally well recovered even at extremely large offset angles, but that these spectra show strong systematic noise. 4U1700-377 shows frequent, strong, but short flux variations. Accordingly, the INTEGRAL-ISGRI spectra show significant fluctuations in flux on short timescales.

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