HIGH-ENERGY EMISSION OF THE FIRST MILLISECOND PULSAR
We report on X-ray and gamma-ray observations of the millisecond pulsar (MSP) B1937+21 taken with the Chandra X-ray Observatory, XMM-Newton, and the Fermi Large Area Telescope. The pulsar X-ray emission shows a purely non-thermal spectrum with a hard photon index of 0.9 + or - 0.1, and is nearly 100...
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| Veröffentlicht in: | The Astrophysical journal 2014-06, Vol.787 (2), p.1-10 |
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| creator | Ng, C-Y Takata, J Leung, G C K Cheng, K S Philippopoulos, P |
| description | We report on X-ray and gamma-ray observations of the millisecond pulsar (MSP) B1937+21 taken with the Chandra X-ray Observatory, XMM-Newton, and the Fermi Large Area Telescope. The pulsar X-ray emission shows a purely non-thermal spectrum with a hard photon index of 0.9 + or - 0.1, and is nearly 100% pulsed. We found no evidence of varying pulse profile with energy as previously claimed. We also analyzed 5.5 yr of Fermi survey data and obtained much improved constraints on the pulsar's timing and spectral properties in gamma-rays. The pulsed spectrum is adequately fitted by a simple power-law with a photon index of 2.38 + or - 0.07. Both the gamma-ray and X-ray pulse profiles show similar two-peak structure and generally align with the radio peaks. We found that the aligned profiles and the hard spectrum in X-rays seem to be common properties among MSPs with high magnetic fields at the light cylinder. We discuss a possible physical scenario that could give rise to these features. |
| doi_str_mv | 10.1088/0004-637X/787/2/167 |
| format | Article |
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The pulsar X-ray emission shows a purely non-thermal spectrum with a hard photon index of 0.9 + or - 0.1, and is nearly 100% pulsed. We found no evidence of varying pulse profile with energy as previously claimed. We also analyzed 5.5 yr of Fermi survey data and obtained much improved constraints on the pulsar's timing and spectral properties in gamma-rays. The pulsed spectrum is adequately fitted by a simple power-law with a photon index of 2.38 + or - 0.07. Both the gamma-ray and X-ray pulse profiles show similar two-peak structure and generally align with the radio peaks. We found that the aligned profiles and the hard spectrum in X-rays seem to be common properties among MSPs with high magnetic fields at the light cylinder. 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The pulsar X-ray emission shows a purely non-thermal spectrum with a hard photon index of 0.9 + or - 0.1, and is nearly 100% pulsed. We found no evidence of varying pulse profile with energy as previously claimed. We also analyzed 5.5 yr of Fermi survey data and obtained much improved constraints on the pulsar's timing and spectral properties in gamma-rays. The pulsed spectrum is adequately fitted by a simple power-law with a photon index of 2.38 + or - 0.07. Both the gamma-ray and X-ray pulse profiles show similar two-peak structure and generally align with the radio peaks. We found that the aligned profiles and the hard spectrum in X-rays seem to be common properties among MSPs with high magnetic fields at the light cylinder. We discuss a possible physical scenario that could give rise to these features.</abstract><cop>United States</cop><doi>10.1088/0004-637X/787/2/167</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-8731-0129</orcidid><oa>free_for_read</oa></addata></record> |
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| source | IOP Publishing Free Content; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Cylinders EMISSION GAMMA RADIATION Gamma rays LIMITING VALUES MAGNETIC FIELDS Millisecond pulsars PHOTONS PULSARS SPECTRA STARS TELESCOPES VISIBLE RADIATION X RADIATION X-rays XMM (spacecraft) |
| title | HIGH-ENERGY EMISSION OF THE FIRST MILLISECOND PULSAR |
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