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Discovery of synchronous X-ray and radio moding of PSR B0823+26

Discovery of synchronous X-ray and radio moding of PSR B0823+26
Discovery of synchronous X-ray and radio moding of PSR B0823+26
Simultaneous observations of PSR B0823+26 with ESA's XMM-Newton, the Giant Metrewave Radio Telescope and international stations of the Low Frequency Array revealed synchronous X-ray/radio switching between a radio-bright (B) mode and a radio-quiet (Q) mode. During the B mode we detected PSR B0823+26 in 0.2-2 keV X-rays and discovered pulsed emission with a broad sinusoidal pulse, lagging the radiomain pulse by 0.208+/-0.012 in phase, with high pulsed fraction of 70-80%. During the Q mode PSR B0823+26 was not detected in X-rays (2sigma upper limit a factor ~9 below the B-mode flux). The total X-ray spectrum, pulse profile and pulsed fraction can globally be reproduced with a magnetized partially ionized hydrogen atmosphere model with three emission components: a primary small hot spot (T~3.6x10^6 K, R~17 m), a larger cooler concentric ring (T~1.1x10^6 K, R~280 m) and an antipodal hot spot (T~1.1x10^6 K, R~100 m), for the angle between the rotation axis and line of sight direction ~66deg. The latter is in conflict with the radio derived value of (84+/-0.7)deg. The average X-ray flux within hours-long B-mode intervals varied by a factor +/-20%, possibly correlated with variations in the frequency and lengths of short radio nulls or short durations of weak emission. The correlated X-ray/radio moding of PSR B0823+26 is compared with the anti-correlated moding of PSR B0943+10, and the lack of X-ray moding of PSR B1822-09. We speculate that the X-ray/radio switches of PSR B0823+26 are due to variations in the rate of accretion of material from the interstellar medium through which it is passing.
0035-8711
3655-3670
Hermsen, W.
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Kuiper, L.
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Basu, R.
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Hessels, J.W.T.
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Mitra, D.
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Stappers, B.W.
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Wright, G.A.E.
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Griessmeier, J.-M.
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Serylak, M.
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Horneffer, A.
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Tiburzi, C.
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Ho, Wynn C.G.
d78d4c52-8f92-4846-876f-e04a8f803a45
Hermsen, W.
12db2849-9116-45a8-8cc5-8ddde433c4cb
Kuiper, L.
57edb067-301b-4ee0-a766-22e913810cdd
Basu, R.
744a3b05-2f83-4173-89f1-6f9c51c6a66e
Hessels, J.W.T.
d06fd631-5e84-428d-8de5-f1a7ad52921c
Mitra, D.
03d1eda8-67b1-4b50-9975-6748186e5942
Stappers, B.W.
77a0f436-0f99-487d-91bf-4870945a1fd4
Wright, G.A.E.
432056ad-981f-492c-9c6a-0e01aa6dd16c
Griessmeier, J.-M.
8acfe4b1-c49e-47ea-aeca-dbb3f90d4ad5
Serylak, M.
65e6e345-3afc-4ea6-b348-2678fff08dff
Horneffer, A.
cb783ab9-da4c-483b-bddd-9cd4bc35f6c8
Tiburzi, C.
f91ad5b9-8de9-47c2-8bf9-1e2715a4c113
Ho, Wynn C.G.
d78d4c52-8f92-4846-876f-e04a8f803a45

Hermsen, W., Kuiper, L., Basu, R., Hessels, J.W.T., Mitra, D., Stappers, B.W., Wright, G.A.E., Griessmeier, J.-M., Serylak, M., Horneffer, A., Tiburzi, C. and Ho, Wynn C.G. (2018) Discovery of synchronous X-ray and radio moding of PSR B0823+26. Monthly Notices of the Royal Astronomical Society, 480 (3), 3655-3670. (doi:10.1093/mnras/sty2075).

Record type: Article

Abstract

Simultaneous observations of PSR B0823+26 with ESA's XMM-Newton, the Giant Metrewave Radio Telescope and international stations of the Low Frequency Array revealed synchronous X-ray/radio switching between a radio-bright (B) mode and a radio-quiet (Q) mode. During the B mode we detected PSR B0823+26 in 0.2-2 keV X-rays and discovered pulsed emission with a broad sinusoidal pulse, lagging the radiomain pulse by 0.208+/-0.012 in phase, with high pulsed fraction of 70-80%. During the Q mode PSR B0823+26 was not detected in X-rays (2sigma upper limit a factor ~9 below the B-mode flux). The total X-ray spectrum, pulse profile and pulsed fraction can globally be reproduced with a magnetized partially ionized hydrogen atmosphere model with three emission components: a primary small hot spot (T~3.6x10^6 K, R~17 m), a larger cooler concentric ring (T~1.1x10^6 K, R~280 m) and an antipodal hot spot (T~1.1x10^6 K, R~100 m), for the angle between the rotation axis and line of sight direction ~66deg. The latter is in conflict with the radio derived value of (84+/-0.7)deg. The average X-ray flux within hours-long B-mode intervals varied by a factor +/-20%, possibly correlated with variations in the frequency and lengths of short radio nulls or short durations of weak emission. The correlated X-ray/radio moding of PSR B0823+26 is compared with the anti-correlated moding of PSR B0943+10, and the lack of X-ray moding of PSR B1822-09. We speculate that the X-ray/radio switches of PSR B0823+26 are due to variations in the rate of accretion of material from the interstellar medium through which it is passing.

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1808.01901 - Accepted Manuscript
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Accepted/In Press date: 30 July 2018
e-pub ahead of print date: 2 August 2018
Published date: 1 November 2018

Identifiers

Local EPrints ID: 423112
URI: http://eprints.soton.ac.uk/id/eprint/423112
ISSN: 0035-8711
PURE UUID: 093d019d-20f1-4b71-948a-ee9d5d3454ce
ORCID for Wynn C.G. Ho: ORCID iD orcid.org/0000-0002-6089-6836

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Date deposited: 14 Aug 2018 16:30
Last modified: 17 Dec 2019 01:42

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