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Very low frequency ({\nu} ~ 1.9 mHz) quasi-periodic oscillations (QPO) havebeen detected in 2 - 60 keV X-rays from 4U1700-37 using auto-correlationfunction analysis of RXTE archival data. No pulsar signal was detected in thedata. Less than 0.5% of the flux from the source (3{\sigma} upper limit) iscoherently pulsed with a period between 250 ms and 40 s. This upper limitcorresponds to a pulsed flux <0.02 mJy. The existence of QPO in 4U1700-37 andthe lack of a detected pulsar indicates that the X-ray source is more likely tobe a black hole than a neutron star, consistent with recent mass estimates.

Very Low Frequency QPO in 4U1700-37