The MAVERIC survey: A transitional millisecond pulsar candidate in Terzan 5.
2018
Transitional
millisecond pulsarsare accreting
millisecond pulsarsthat switch between accreting
X-ray binaryand
millisecondradio
pulsarstates. Only a handful of these objects have been identified so far. Terzan 5 CX1 is a variable
hard X-raysource in the
globular clusterTerzan 5. In this paper, we identify a radio counterpart to CX1 in deep Very Large Array radio continuum data. Chandra observations over the last fourteen years indicate that CX1 shows two brightness states: in 2003 and 2016 the source was the brightest X-ray source in the cluster (at L$_X \sim 10^{33}$ erg s$^{-1}$), while in many intermediate observations, its luminosity was almost an order of magnitude lower. We analyze all available X-ray data of CX1, showing that the two states are consistent with the spectral and variability properties observed for the X-ray active and radio
pulsarstates of known transitional
millisecond pulsars. Finally, we discuss the prospects for the detection of CX1 as a radio
pulsarin existing timing data.
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