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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