Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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Pulsar Polar Cap and Slot Gap Models: Confronting Fermi Data

  • Harding, Alice K. (Astrophysics Science Division, NASA Goddard Space Flight Center)
  • Received : 2012.11.30
  • Accepted : 2012.12.31
  • Published : 2013.09.15
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Abstract

Rotation-powered pulsars are excellent laboratories for studying particle acceleration as well as fundamental physics of strong gravity, strong magnetic fields and relativity. Particle acceleration and high-energy emission from the polar caps is expected to occur in connection with electron-positron pair cascades. I will review acceleration and gamma-ray emission from the pulsar polar cap and associated slot gap. Predictions of these models can be tested with the data set on pulsars collected by the Large Area Telescope on the Fermi Gamma-Ray Telescope over the last four years, using both detailed light curve fitting, population synthesis and phase-resolved spectroscopy.

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References

  1. Abdo AA, Ackermann M, Ajello M, Allafort A, Antolini E, et al., Fermi Large Area Telescope First Source Catalog, ApJS, 188, 405-436 (2010a). http://dx.doi.org/10.1088/0067-0049/188/2/405
  2. Abdo AA, Ackermann M, Ajello M, Allafort A, Atwood WB, et al., The Vela Pulsar: Results from the First Year of Fermi LAT Observations, ApJ, 713, 154-155 (2010b). http://dx.doi.org/10.1088/0004-637X/713/1/154
  3. Abdo AA, Ackermann M, Ajello M, Allafort A, Baldini L, et al., Fermi Large Area Telescope Observations of the Vela Pulsar, ApJ, 696, 1084-1093 (2009a). http://dx.doi.org/10.1088/0004-637X/696/2/1084
  4. Abdo AA, Ackermann M, Ajello M, Anderson B, Axelsson M, et al., Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT, Science, 325, 840-844 (2009b). http://dx.doi.org/10.1126/science.1175558
  5. Abdo AA, Ackermann M, Ajello M, Atwood WB, Axelsson M, et al., A Population of Gamma-Ray Millisecond Pulsars Seen with the Fermi Large Area Telescope, Science, 325, 848-852 (2009c). http://dx.doi.org/10.1126/science.1176113
  6. Abdo AA, Ackermann M, Ajello M, Atwood WB, Axelsson M, et al., Fermi Large Area Telescope Observations of the Crab Pulsar And Nebula, ApJ, 708, 1254-1267 (2010c). http://dx.doi.org/10.1088/0004-637X/708/2/1254
  7. Abdo AA, Ackermann M, Ajello M, Baldini L, Ballet J, et al., Fermi-LAT Observations of the Geminga Pulsar, ApJ, 720, 272-283 (2010d). http://dx.doi.org/10.1088/0004-637X/720/1/272
  8. Abdo AA, et al. ApJS, in prep. (2013)
  9. Arons J, Pair creation above pulsar polar caps - Geometrical structure and energetics of slot gaps, ApJ, 266, 215-241 (1983). http://dx.doi.org/10.1086/160771
  10. Arons J, Scharlemann ET, Pair formation above pulsar polar caps - Structure of the low altitude acceleration zone, ApJ, 231, 854-879 (1979). http://dx.doi.org/10.1086/157250
  11. Bai X, Spitkovsky A, Modeling of Gamma-ray Pulsar Light Curves Using the Force-free Magnetic Field, ApJ, 715, 1282-1301 (2010). http://dx.doi.org/10.1088/0004-637X/715/2/1282
  12. Cheng KS, Ruderman MA, Zhang L, A Three-dimensional Outer Magnetospheric Gap Model for Gamma-Ray Pulsars: Geometry, Pair Production, Emission Morphologies, and Phase-resolved Spectra, ApJ, 537, 964-976 (2000). http://dx.doi.org/10.1086/309051
  13. Daugherty JK, Harding AK, Electromagnetic cascades in pulsars, ApJ, 252, 337-347 (1982). 1 (1955). http://dx.doi.org/10.1086/159561
  14. Daugherty JK, Harding, AK, Pair production in superstrong magnetic fields, ApJ, 273, 761-773 (1983). http://dx.doi.org/10.1086/161411
  15. Decesar ME, Harding AK, Miller MC, Kalapotharakos C, Contopoulos I, et al., Constraints on Emission and Field Geometry of Gamma-ray Pulsars from Phase Resolved Spectroscopy and Light Curve Modeling, ApJ, submitted (2013).
  16. Deutsch A, The electromagnetic field of an idealized star in rigid rotation in vacuo, Annales d'Astrophysique, 18,1(1955)
  17. Dyks J, Rudak B, Two-Pole Caustic Model for High-Energy Light Curves of Pulsars, ApJ, 598, 1201-1206 (2003). http://dx.doi.org/10.1086/379052
  18. Dyks J, Harding AK, Rudak B, Relativistic Effects and Polarization in Three High-Energy Pulsar Models, ApJ, 606, 1125-1142 (2004). http://dx.doi.org/10.1086/383121
  19. Erber T, High-Energy Electromagnetic Conversion Processes in Intense Magnetic Fields, Rev. Mod. Phys., 38, 626-659 (1966). http://dx.doi.org/10.1103/RevModPhys.38.626
  20. Goldreich P, Julian WH, Pulsar Electrodynamics, ApJ, 157, 869-880 (1969). http://dx.doi.org/10.1086/150119
  21. Harding AK, Daugherty JK, Pulse profiles and spectra of gamma ray pulsars in the polar cap model, AdSpR, 21, 251-254 (1998). http://dx.doi.org/10.1016/S0273-1177(97)00811-9
  22. Harding AK, Muslimov AG, Particle Acceleration Zones above Pulsar Polar Caps: Electron and Positron Pair Formation Fronts, ApJ, 508, 328-346 (1998). http://dx.doi.org/10.1086/306394
  23. Harding AK, Muslimov AG, Pulsar Pair Cascades in a Distorted Magnetic Dipole Field, ApJL, 726, L10-L14 (2011a). http://dx.doi.org/10.1088/2041-8205/726/1/L10
  24. Harding AK, Muslimov AG, Pulsar Pair Cascades in Magnetic Fields with Offset Polar Caps, ApJ, 743, 181, 16pp (2011b). http://dx.doi.org/10.1088/0004-637X/743/2/181
  25. Harding AK, Usov VV, Muslimov AG, High-Energy Emission from Millisecond Pulsars, ApJ, 622, 531-543 (2005). http://dx.doi.org/10.1086/427840
  26. Harding AK, DeCesar ME, Miller MC, Kalapotharakos C, Contopoulos I, Gamma-Ray Pulsar Light Curves in Vacuum and Force-Free Geometry, in 2011 Fermi Symposium, Roma, May 9-12 2011
  27. Johnson TJ, Constraints on the Emission Geometries of Gamma-ray Millisecond Pulsars Observed with the Fermi Large Area Telescope, Ph.D. Thesis, University of Maryland (2012). http://arxiv.org/pdf/1209.4000v1.pdf
  28. Johnson TJ, Harding AK, Venter C, ApJS, in prep. (2013).
  29. Kalapotharakos C, Kazanas D, Harding A, Contopoulos I, Toward a Realistic Pulsar Magnetosphere, ApJ, 749, 2-15 (2012a). http://dx.doi.org/10.1088/0004-637X/749/1/2
  30. Kalapotharakos C, Harding AK, Kazanas D, Contopoulos I, Gamma-Ray Light Curves from Pulsar Magnetospheres with Finite Conductivity, ApJ, 754, L1-L5 (2012b). http://dx.doi.org/10.1088/2041-8205/754/1/L1
  31. Lyubarskii YE, Petrova SA, Synchrotron absorption in pulsar magnetospheres, A&A, 337, 433-440 (1998).
  32. Medin Z, Lai D, Condensed surfaces of magnetic neutron stars, thermal surface emission, and particle acceleration above pulsar polar caps, MNRAS, 382, 1833-1852 (2007). http://dx.doi.org/10.1111/j.1365-2966.2007.12492.x
  33. Morini M, Inverse Compton gamma-ray from pulsars. I - The VELA pulsar, MNRAS, 202, 495-510 (1983). https://doi.org/10.1093/mnras/202.2.495
  34. Muslimov AG, Harding AK, Extended Acceleration in Slot Gaps and Pulsar High-Energy Emission, ApJ, 588, 430- 440 (2003). http://dx.doi.org/ 10.1086/368162
  35. Muslimov AG, Harding AK, High-Altitude Particle Acceleration and Radiation in Pulsar Slot Gaps, ApJ, 606, 1143-1153 (2004). http://dx.doi.org/10.1086/383079
  36. Muslimov AG, Tsygan AI, General relativistic electric potential drops above pulsar polar caps, MNRAS, 255, 61-70 (1992). https://doi.org/10.1093/mnras/255.1.61
  37. Pierbattista M, Grenier IA, Harding AK, Gonthier PL, Constraining $\gamma$-ray pulsar gap models with a simulated pulsar population, A&A, 545, 42-64 (2012). http://dx.doi.org/10.1051/0004-6361/201219135
  38. Pierbattista M, Grenier IA, Harding AK, in prep. (2013).
  39. Ransom SM, Ray PS, Camilo F, Roberts MSE, Celik O, et al., Three Millisecond Pulsars in Fermi LAT Unassociated Bright Sources, ApJ, 727, L16-L21 (2011). http://dx.doi.org/10.1088/2041-8205/727/1/L16
  40. Romani RW, Yadigaroglu IA, Gamma-ray pulsars: Emission zones and viewing geometries, ApJ, 438, 314-321 (1995). http://dx.doi.org/10.1086/175076
  41. Ruderman MA, Sutherland PG, Theory of pulsars - Polar caps, sparks, and coherent microwave radiation, ApJ, 196, 51-72 (1975). http://dx.doi.org/10.1086/153393
  42. Spitkovsky A, Time-dependent Force-free Pulsar Magnetospheres : Axisymmetri c and Oblique Rotators, ApJ, 648, L51-L54 (2006). http://dx.doi.org/10.1086/507518
  43. Sturner SJ, Dermer CD, Michel FC, Magnetic Comptoninduced pair cascade model for gamma-ray pulsars, ApJ, 445, 736-755 (1995). http://dx.doi.org/10.1086/175736
  44. Timokhin A, On the force-free magnetosphere of an aligned rotator, MNRAS, 368, 1055-1072 (2006). http://dx.doi.org/10.1111/j.1365-2966.2006.10192.x
  45. Timokhin A, Arons J, Current flow and pair creation at low altitude in rotation-powered pulsars' force-free magnetospheres: space charge limited flow, MNRAS, 429, 20-54 (2013). http://dx.doi.org/10.1093/mnras/sts298
  46. Usov VV, Melrose DB, Pulsars with Strong Magnetic Fields - Polar Gaps Bound Pair Creation and Nonthermal Luminosities, Aust. J. Phys., 48, 571-612 (1995). http://dx.doi.org/10.1071/PH950571
  47. Venter C, Harding AK, Guillemot L, Probing Millisecond Pulsar Emission Geometry Using Light Curves from the Fermi/Large Area Telescope, ApJ, 707, 800-822 (2009). http://dx.doi.org/10.1088/0004-637X/707/1/800
  48. Venter C, Johnson TJ, Harding AK., Modeling Phase-aligned Gamma-Ray and Radio Millisecond Pulsar Light Curves, ApJ, 744, 34 (2012). http://dx.doi.org/10.1088/0004-637X/744/1/34
  49. Watters KP, Romani RW, The Galactic Population of Young $\gamma$-ray Pulsars, ApJ, 727, 123-136 (2011). http://dx.doi.org/10.1088/0004-637X/727/2/123
  50. Watters KP, Romani RW, Weltevrede P, Johnston S, An Atlas for Interpreting $\gamma$-Ray Pulsar Light Curves, ApJ, 695, 1289-1301 (2009). http://dx.doi.org/10.1088/0004-637X/695/2/1289

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