RXTE Observations of Persistent Galactic Microquasars

Details RXTE Observations of Persistent Galactic Microquasars RXTE Observations of Persistent Galactic Microquasars

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr..e602s&link_type=abstract

American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #E6.02

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We are studying two persistent black hole candidates in the Galactic bulge, 1E 1740.7-2942 and GRS 1758-258, with the Rossi X-ray Timing Explorer (RXTE). These two objects have received particular attention because, like some black-hole x-ray transients, they have radio jets which suggest a resemblance to active galactic nuclei. They are also among the leading candidates for sources of the Galactic Center positrons. Strong optical extinction has so far prevented the identification of optical counterparts, so the nature of the systems must be deduced by comparison with other systems. With RXTE, we now have measurements of fast variability in these objects for the first time. I will present these timing results and our spectral results, and compare them with other black hole systems such as Cyg X-1 and with the low-magnetic-field accreting neutron stars (``atoll sources''), which are easiest to confuse with black holes when using high-energy observations alone.

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