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Title: Simultaneous X-ray and radio observations of the radio-mode-switching pulsar PSR B1822$-$09

Here, we report on simultaneous X-ray and radio observations of the radio-mode-switching pulsar PSR B1822–09 with ESA's XMM–Newton and the Westerbork Synthesis Radio Telescope, Giant Metrewave Radio Telescope and Lovell radio telescopes. PSR B1822–09 switches between a radio-bright and radio-quiet mode, and we discovered a relationship between the durations of its modes and a known underlying radio-modulation time-scale within the modes. We discovered X-ray (energies 0.2–1.4 keV) pulsations with a broad sinusoidal pulse, slightly lagging the radio main pulse in phase by 0.094 ± 0.017, with an energy-dependent pulsed fraction varying from ~0.15 at 0.3 keV to ~0.6 at 1 keV. No evidence is found for simultaneous X-ray and radio mode switching. The total X-ray spectrum consists of a cool component (T ~0.96 × 10 6 K, hotspot radius R ~2.0 km) and a hot component (T ~2.2 × 10 6 K, R ~100 m). The hot component can be ascribed to the pulsed emission and the cool component to the unpulsed emission. The high-energy characteristics of PSR B1822–09 resemble those of middle-aged pulsars such as PSR B0656+14, PSR B1055–52 and Geminga, including an indication for pulsed high-energy gamma-ray emission in Fermi Large Area Telescope data. Explanations for the highmore » pulsed fraction seem to require different temperatures at the two poles of this orthogonal rotator, or magnetic anisotropic beaming effects in its strong magnetic field. In our X-ray skymap, we found a harder source at only 5.1 ± 0.5 arcsec from PSR B1822–09, which might be a pulsar wind nebula.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [3]
  1. SRON Netherlands Institute for Space Research, Utrecht (The Netherlands); Univ. of Amsterdam, Amsterdam (The Netherlands)
  2. SRON Netherlands Institute for Space Research, Utrecht (The Netherlands)
  3. Univ. of Amsterdam, Amsterdam (The Netherlands); ASTRON, the Netherlands Institute for Radio Astronomy, Dwingeloo (The Netherlands)
  4. Pune Univ., Pune (India); Univ. of Vermont, Burlington, VT (United States); Univ. of Zielona Gora, Zielona Gora (Poland)
  5. Univ. of Amsterdam, Amsterdam (The Netherlands); Univ. of Vermont, Burlington, VT (United States)
  6. Univ. of Manchester, Manchester (United Kingdom)
  7. Univ. of Manchester, Manchester (United Kingdom); Univ. of Sussex, Brighton (United Kingdom)
  8. Pune Univ., Pune (India); Univ. of Zielona Gora, Zielona Gora (Poland)
  9. ASTRON, the Netherlands Institute for Radio Astronomy, Dwingeloo (The Netherlands); Univ. of Zielona Gora, Zielona Gora (Poland)
Publication Date:
Grant/Contract Number:
09-68296; 337062; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 466; Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; stars: neutron; pulsars: general; radio continuum: stars; X-rays: individual: PSR B1822−09
OSTI Identifier:
1355731

Hermsen, W., Kuiper, L., Hessels, J. W. T., Mitra, D., Rankin, J. M., Stappers, B. W., Wright, G. A. E., Basu, R., Szary, A., and van Leeuwen, J.. Simultaneous X-ray and radio observations of the radio-mode-switching pulsar PSR B1822$-$09. United States: N. p., Web. doi:10.1093/mnras/stw3135.
Hermsen, W., Kuiper, L., Hessels, J. W. T., Mitra, D., Rankin, J. M., Stappers, B. W., Wright, G. A. E., Basu, R., Szary, A., & van Leeuwen, J.. Simultaneous X-ray and radio observations of the radio-mode-switching pulsar PSR B1822$-$09. United States. doi:10.1093/mnras/stw3135.
Hermsen, W., Kuiper, L., Hessels, J. W. T., Mitra, D., Rankin, J. M., Stappers, B. W., Wright, G. A. E., Basu, R., Szary, A., and van Leeuwen, J.. 2016. "Simultaneous X-ray and radio observations of the radio-mode-switching pulsar PSR B1822$-$09". United States. doi:10.1093/mnras/stw3135. https://www.osti.gov/servlets/purl/1355731.
@article{osti_1355731,
title = {Simultaneous X-ray and radio observations of the radio-mode-switching pulsar PSR B1822$-$09},
author = {Hermsen, W. and Kuiper, L. and Hessels, J. W. T. and Mitra, D. and Rankin, J. M. and Stappers, B. W. and Wright, G. A. E. and Basu, R. and Szary, A. and van Leeuwen, J.},
abstractNote = {Here, we report on simultaneous X-ray and radio observations of the radio-mode-switching pulsar PSR B1822–09 with ESA's XMM–Newton and the Westerbork Synthesis Radio Telescope, Giant Metrewave Radio Telescope and Lovell radio telescopes. PSR B1822–09 switches between a radio-bright and radio-quiet mode, and we discovered a relationship between the durations of its modes and a known underlying radio-modulation time-scale within the modes. We discovered X-ray (energies 0.2–1.4 keV) pulsations with a broad sinusoidal pulse, slightly lagging the radio main pulse in phase by 0.094 ± 0.017, with an energy-dependent pulsed fraction varying from ~0.15 at 0.3 keV to ~0.6 at 1 keV. No evidence is found for simultaneous X-ray and radio mode switching. The total X-ray spectrum consists of a cool component (T ~0.96 × 106 K, hotspot radius R ~2.0 km) and a hot component (T ~2.2 × 106 K, R ~100 m). The hot component can be ascribed to the pulsed emission and the cool component to the unpulsed emission. The high-energy characteristics of PSR B1822–09 resemble those of middle-aged pulsars such as PSR B0656+14, PSR B1055–52 and Geminga, including an indication for pulsed high-energy gamma-ray emission in Fermi Large Area Telescope data. Explanations for the high pulsed fraction seem to require different temperatures at the two poles of this orthogonal rotator, or magnetic anisotropic beaming effects in its strong magnetic field. In our X-ray skymap, we found a harder source at only 5.1 ± 0.5 arcsec from PSR B1822–09, which might be a pulsar wind nebula.},
doi = {10.1093/mnras/stw3135},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 466,
place = {United States},
year = {2016},
month = {12}
}