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34 papers
XMM-Newton Observation and Optical Monitoring of the Candidate Redback Millisecond Pulsar 1FGL J0523.52529
J. P. Halpern, S. Bogdanov
1FGL J0523.52529 is a Fermi selected redback millisecond pulsar candidate that exhibited luminous optical and X-ray flares in 2020-2021. We obtained a simultaneous X-ray and …
X-ray measurement of a high-mass white dwarf and its spin for the intermediate polar IGR J18434-0508
Julian Gerber, Jeremy Hare, John A. Tomsick +8
IGR J18434-0508 is a Galactic Intermediate Polar (IP) type Cataclysmic Variable (CV) previously classified through optical spectroscopy. The source is already known to have a hard…
X-ray and Radio Variabilities of PSR J2032+4127 near Periastron
C. -Y. Ng, W. C. G. Ho, E. V. Gotthelf +6
We present X-ray and radio monitoring observations of the gamma-ray binary PSR J2032+4127/MT91 213 during its periastron passage in late 2017. Dedicated Chandra, XMM-Newton,NuSTAR…
Orbital Dynamics of Candidate Transitional Millisecond Pulsar 3FGL J1544.6-1125: An unusually face-on system
Christopher T. Britt, Jay Strader, Laura Chomiuk +4
We present the orbital solution for the donor star of the candidate transitional millisecond pulsar 3FGL J1544.6-1125, currently observed as an accreting low-mass X-ray binary. The…
A Likely Redback Millisecond Pulsar Counterpart of 3FGL J0838.8-2829
J. P. Halpern, J. Strader, M. Li
We obtained new optical observations of the X-ray source XMMU J083850.38-282756.8, the previously proposed counterpart of the gamma-ray source 3FGL J0838.8-2829. Time-series photom…
Evolution of the X-ray Properties of the Transient Magnetar XTE J1810-197
Jason Alford, Jules Halpern
We report on X-ray observations of the 5.54 s transient magnetar XTE J1810-197 using the XMM-Newton and Chandra observatories, analyzing new data from 2008 through 2014, and re-ana…