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X-ray and radio variabilities of PSR J2032+4127 near periastron

X-ray and radio variabilities of PSR J2032+4127 near periastron
X-ray and radio variabilities of PSR J2032+4127 near periastron
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 VLA radio observations of this long orbit (50 years), 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 photon index from Gamma=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 multi-wavelength comparison indicates that the X-ray and radio spectra cannot be simply connected by a single power-law component. Hence, the emission in these two energy bands must originate from different particle populations.
1538-4357
1-11
Ng, C.-Y.
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Ho, Wynn C.G.
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Eric V., Gotthelf
3969a02f-38be-4095-89d7-fdbcc7fd053a
Halpern, Jules P.
85bc7252-e71b-4b31-9b1d-cccaccd199f5
Coe, Malcolm J.
04dfb23b-1456-46a3-9242-5cee983471d5
Stappers, Benjamin W.
77a0f436-0f99-487d-91bf-4870945a1fd4
Lyne, Andrew G.
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Wood, Kent S.
1a18d32c-94a8-427d-b9a6-84282eb53c9d
Kerr, Matthew
ab289c1e-9f3f-485f-9a66-b8cd8940a094
Ng, C.-Y.
76622418-7d39-49bd-832e-54363ee26ddf
Ho, Wynn C.G.
d78d4c52-8f92-4846-876f-e04a8f803a45
Eric V., Gotthelf
3969a02f-38be-4095-89d7-fdbcc7fd053a
Halpern, Jules P.
85bc7252-e71b-4b31-9b1d-cccaccd199f5
Coe, Malcolm J.
04dfb23b-1456-46a3-9242-5cee983471d5
Stappers, Benjamin W.
77a0f436-0f99-487d-91bf-4870945a1fd4
Lyne, Andrew G.
125477b1-9035-43c0-a390-a2bcedf97903
Wood, Kent S.
1a18d32c-94a8-427d-b9a6-84282eb53c9d
Kerr, Matthew
ab289c1e-9f3f-485f-9a66-b8cd8940a094

Ng, C.-Y., Ho, Wynn C.G., Eric V., Gotthelf, Halpern, Jules P., Coe, Malcolm J., Stappers, Benjamin W., Lyne, Andrew G., Wood, Kent S. and Kerr, Matthew (2019) X-ray and radio variabilities of PSR J2032+4127 near periastron. The Astrophysical Journal, 880 (2), 1-11, [147]. (doi:10.3847/1538-4357/ab2adb).

Record type: Article

Abstract

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 VLA radio observations of this long orbit (50 years), 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 photon index from Gamma=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 multi-wavelength comparison indicates that the X-ray and radio spectra cannot be simply connected by a single power-law component. Hence, the emission in these two energy bands must originate from different particle populations.

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1907.05749 - Accepted Manuscript
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Accepted/In Press date: 19 June 2019
Published date: 5 August 2019

Identifiers

Local EPrints ID: 432654
URI: http://eprints.soton.ac.uk/id/eprint/432654
ISSN: 1538-4357
PURE UUID: 4610c3ba-38ea-455c-a355-0ee3fa31b80f
ORCID for Wynn C.G. Ho: ORCID iD orcid.org/0000-0002-6089-6836
ORCID for Malcolm J. Coe: ORCID iD orcid.org/0000-0002-0763-8547

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Date deposited: 23 Jul 2019 16:30
Last modified: 28 Nov 2019 01:40

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