A deep campaign to characterize the synchronous radio/X-ray mode switching of PSR B0943+10

Mereghetti S, Kuiper L, Tiengo A, Hessels J, Hermsen W, Stovall K, Possenti A, Rankin J, Esposito P, Turolla R, Mitra D, et al. (2016)
Astrophysical Journal 831(1): 21.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Observations of PSR B0943+10 with XMM-Newton and the LOFAR, LWA, and Arecibo radio telescopes in 2014 November confirm the synchronous X-ray/radio switching between a radio-bright (B) mode and a radio-quiet (Q) mode, in which the X-ray flux is a factor similar to 2.4 higher than in the B-mode. We discovered X-ray pulsations during the B-mode (0.5-2 keV pulsed fraction of (38 +/- 5)%) and confirm their presence in the Q-mode, where the pulsed fraction increases with energy from similar to 20% to similar to 65% at 2 keV. We found marginal evidence for an increase in the X-ray pulsed fraction during the B-mode on a timescale of hours. The X-ray spectrum during the Q-mode requires a fit with either a power law plus blackbody or the sum of two blackbodies, while in the B-mode it is well fit by a single blackbody (a single power law is rejected). In the Q-mode, the pulsed emission has a blackbody spectrum with temperature similar to 3.4 x 10(6) K and the unpulsed emission is a power law with photon index similar to 2.5, while during the B-mode both the pulsed and unpulsed emission can be fit by either a blackbody or a power law with similar values of temperature and index. A Chandra image does not show diffuse X-ray emission. These results support a scenario in which unpulsed non-thermal emission, likely magnetospheric, and pulsed thermal emission from a small polar cap (similar to 1500 m(2)) with a non-dipolar field (similar to 10(14) G) are present during both modes and vary in a correlated way. This is broadly consistent with the partially screened gap model and does not necessarily imply global magnetospheric rearrangements to explain the mode switching.
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Astrophysical Journal
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831
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1
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21
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Mereghetti S, Kuiper L, Tiengo A, et al. A deep campaign to characterize the synchronous radio/X-ray mode switching of PSR B0943+10. Astrophysical Journal. 2016;831(1): 21.
Mereghetti, S., Kuiper, L., Tiengo, A., Hessels, J., Hermsen, W., Stovall, K., Possenti, A., et al. (2016). A deep campaign to characterize the synchronous radio/X-ray mode switching of PSR B0943+10. Astrophysical Journal, 831(1), 21. doi:10.3847/0004-637X/831/1/21
Mereghetti, S., Kuiper, L., Tiengo, A., Hessels, J., Hermsen, W., Stovall, K., Possenti, A., Rankin, J., Esposito, P., Turolla, R., et al. (2016). A deep campaign to characterize the synchronous radio/X-ray mode switching of PSR B0943+10. Astrophysical Journal 831:21.
Mereghetti, S., et al., 2016. A deep campaign to characterize the synchronous radio/X-ray mode switching of PSR B0943+10. Astrophysical Journal, 831(1): 21.
S. Mereghetti, et al., “A deep campaign to characterize the synchronous radio/X-ray mode switching of PSR B0943+10”, Astrophysical Journal, vol. 831, 2016, : 21.
Mereghetti, S., Kuiper, L., Tiengo, A., Hessels, J., Hermsen, W., Stovall, K., Possenti, A., Rankin, J., Esposito, P., Turolla, R., Mitra, D., Wright, G., Stappers, B., Horneffer, A., Oslowski, S., Serylak, M., Griessmeier, J.-M.: A deep campaign to characterize the synchronous radio/X-ray mode switching of PSR B0943+10. Astrophysical Journal. 831, : 21 (2016).
Mereghetti, S., Kuiper, L., Tiengo, A., Hessels, J., Hermsen, W., Stovall, K., Possenti, A., Rankin, J., Esposito, P., Turolla, R., Mitra, D., Wright, G., Stappers, B., Horneffer, A., Oslowski, Stefan, Serylak, M., and Griessmeier, J. -M. “A deep campaign to characterize the synchronous radio/X-ray mode switching of PSR B0943+10”. Astrophysical Journal 831.1 (2016): 21.

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