The MAVERIC survey: A transitional millisecond pulsar candidate in Terzan 5

Abstract

Transitional millisecond pulsars are accreting millisecond pulsars that switch between accreting X-ray binary and millisecond radio pulsar states. Only a handful of these objects have been identified so far. Terzan 5 CX1 is a variable hard X-ray source in the globular cluster Terzan 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 pulsar states of known transitional millisecond pulsars. Finally, we discuss the prospects for the detection of CX1 as a radio pulsar in existing timing data.

14 pages, 6 figures, ApJ, in press

References in corpus (25)

• The Gaia mission
• A Radio Pulsar/X-ray Binary Link
• Near-IR properties of 24 Globular Clusters in the Galactic Bulge
• Improved Mass and Radius Constraints for Quiescent Neutron Stars in Omega Cen and NGC 6397
• Discovery of PSR J1227-4853: A transition from a low-mass X-ray binary to a redback millisecond pulsar
• X-ray Variability and Evidence for Pulsations from the Unique Radio Pulsar/X-ray Binary Transition Object FIRST J102347.6+003841
• The MAVERIC Survey: Still No Evidence for Accreting Intermediate-mass Black Holes in Globular Clusters
• The Spin Distribution of Fast Spinning Neutron Stars in Low Mass X-Ray Binaries: Evidence for Two Sub-Populations
• Faint X-ray Sources in the Globular Cluster Terzan 5
• X-ray states of redback millisecond pulsars
• Radio Searches of Fermi LAT Sources and Blind Search Pulsars: The Fermi Pulsar Search Consortium
• The behavior of subluminous X-ray transients near the Galactic center as observed using the X-ray telescope aboard Swift
• Identification of the High-Energy Gamma-Ray Source 3FGL J1544.6-1125 as a Transitional Millisecond Pulsar Binary in an Accreting State
• Timing Observations of PSR J1023+0038 During a Low-Mass X-ray Binary State
• Constraints on the space density of intermediate polars from the Swift-BAT survey
• NuSTAR Observations of the State Transition of Millisecond Pulsar Binary PSR J1023+0038
• Simultaneous Chandra and VLA Observations of the Transitional Millisecond Pulsar PSR J1023+0038: Anti-correlated X-ray and Radio Variability
• Discovery of three new millisecond pulsars in Terzan 5
• 1FGL J1417.7-4407: A likely gamma-ray bright binary with a massive neutron star and a giant secondary
• High resolution reddening map in the direction of the stellar system Terzan 5
• A new gamma-ray loud, eclipsing low-mass X-ray binary
• Orbital Dynamics of Candidate Transitional Millisecond Pulsar 3FGL J1544.6-1125: An unusually face-on system
• Rapid Radio Flaring during an Anomalous Outburst of SS Cyg
• X-Ray Studies of Redbacks
• New transient Galactic bulge intermediate polar candidate XMMU J175035.2-293557

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• Prolonged sub-luminous state of the new transitional pulsar candidate CXOU J110926.4-650224
• A Deep Chandra X-ray Observatory Study of the Millisecond Pulsar Population in the Globular Cluster Terzan 5
• The MAVERIC Survey: New compact binaries revealed by deep radio continuum observations of the Galactic globular cluster Terzan 5
• The MAVERIC Survey: Radio catalogs and source counts from deep Very Large Array imaging of 25 Galactic globular clusters
• The MAVERIC Survey: Simultaneous Chandra and VLA observations of the transitional millisecond pulsar candidate NGC 6652B
• A deep Chandra survey for faint X-ray sources in the Galactic globular cluster M30, and searches for optical and radio counterparts
• Multiwavelength evidence for a new flare-mode transitional millisecond pulsar
• Ultra-deep ATCA imaging of 47 Tucanae reveals a central compact radio source
• The $\text{False Widow}$ Link Between Neutron Star X-ray Binaries and Spider Pulsars
• The MAVERIC Survey: The first radio and X-ray limits on the detached black holes in NGC 3201
• The MAVERIC Survey: Dynamical Origin of Radio Sources in Galactic Globular Clusters
• Pulsars and Millisecond Pulsars II: Deep diving into the Evolutionary Mechanisms
• Astrometry of variable compact radio sources: A search for Galactic black hole X-ray binaries