HEAD 2003 Meeting
Session 17. X-ray Binaries III
Poster, Sunday-Wednesday, March 23, 2003, Duration of Meeting

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[17.20] 4U1755-33 in Quiescence

L. Angelini (USRA/GSFC/NASA), N.E. White (GSFC/NASA)

We report an XMM-Newton observation of the Low mass X-ray Binary (LMXB) and black hole candidate 4U1755-33. This source had been a bright persistent source for at least 25 yrs, but in 1995 entered an extended quiescent phase. 4U1755-33 was not detected with an upper limit to the 2--10 keV luminosity of 5 X 1031d4kpc2 ergs s-1 (where d4kpc is the distance in units of 4 kpc) -- consistent with the luminosity of other black hole candidates in a quiescent state. An unexpected result is the discovery of a narrow 7 arc min long X-ray jet centered on the position of 4U1755-33. The spectrum of the jet is similar to that of jets observed from other galactic and extragalactic sources, and may have been ejected from 4U1755-33 when it was bright. Jets are a feature of accreting black holes, and the detection of a fossil jet provides additional evidence supporting the black hole candidacy of 4U1755-33. The spectral properties of three bright serendipitous sources in the field are reported and it is suggested these are background active galactic nuclei sources.

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Bulletin of the American Astronomical Society, 35#2
© 2003. The American Astronomical Soceity.