Astrophys. J., 880, 147-147 (2019/August-1)
X-ray and radio variabilities of PSR J2032+4127 near periastron.
NG C.-Y., HO W.C.G., GOTTHELF E.V., HALPERN J.P., COE M.J., STAPPERS B.W., LYNE A.G., WOOD K.S. and KERR M.
Abstract (from CDS):
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 X-ray observations, and Very Large Array radio observations of this long orbit (50 yr), 143 ms pulsar/Be star system clearly revealed flux and spectral variability during the passage. The X-ray spectrum hardened near periastron, with a significant decrease in the power-law (PL) photon index from Γ ≃ 2 to 1.2 and evidence of an increased absorption column density. We identified a possible spectral break at a few keV in the spectrum that suggests synchrotron cooling. A coincident radio and X-ray flare occurred one week after periastron, which is possibly the result of the pulsar wind interacting with the Be stellar disk and generating synchrotron radiation. However, a multiwavelength comparison indicates that the X-ray and radio spectra cannot be simply connected by a single PL component. Hence, the emission in these two energy bands must originate from different particle populations.
© 2019. The American Astronomical Society. All rights reserved.
pulsars: individual: PSR J2032+4127 - stars: individual: MT91 213 - stars: neutron - X-rays: binaries - X-rays: individual: PSR J2032+4127
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