Suzaku discovery of hard X-ray pulsations from a rotating magnetized white dwarf, AE Aquarii

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概要

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• A fast rotating magnetized white dwarf, AE Aquarii, was observed with Suzaku, in 2005 October-November and 2006 October with exposures of 53.1 and 42.4ks, respectively. In addition to clear spin modulation in the 0.5-10 keV band of the XIS data at the barycentric period of 33.0769 +/- 0.0001 s, the 10-30 keV HXD data in the second half of the 2005 observation also showed statistically significant periodic signals at a consistent period. On that occasion, the spin-folded HXD light curve exhibited two sharp spikes separated by similar to 0.2 cycles in phase, in contrast to approximately sinusoidal profiles observed at energies below similar to 4 keV. The folded 4-10 keV XIS light curves are understood to be a superposition of those two types of pulse profiles. The phase-averaged 1.5-10 keV spectra can be reproduced by two thermal components with temperatures of 2.0(-0.16)(+0.20) keV and 0.53(-0.13)(+0.14) keV but the 12-25 keV HXD data show a significant excess above the extrapolated model. This excess can be explained by either a power-law model with a photon index of 1.12(-0.62)(+0.63) or a third thermal component with a temperature of 54(-47)(+26) keV. At a distance of 102pc, the 4-30keV luminosities of the thermal and the additional components become 1.7(-0.6)(+1.3) and 5.3(-0.3)(+15.3) X 10(29) erg s(-1), respectively. The latter corresponds to 0.09% of the spin-down energy of the object. Possible emission mechanisms of the hard pulsations are discussed, including non-thermal ones, in particular.

• 2008-04-25

著者

• TERADA Yukikatsu

  Department of Physics, Saitama University

• Yamagami Takamasa

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Yamagami Takamasa

  Institute Of Space And Astronautical Science

• Ishida M

  Japan Aerospace Exploration Agency Institute Of Space And Astronautical Science

• BAMBA Aya

  Department of High Energy Astrophysics, Institute of Space and Astronomical Science (ISAS), Japan Ae

• NAIK Sachindra

  Institute of Space and Astronautical Science

• ISHIDA Manabu

  Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan A

• OKADA Shunsaku

  Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan A

• HAYASHI Takayuki

  Department of Physics, Tokyo Metropolitan University

• NAKAMURA Ryoko

  Department of High Energy Astrophysics, Institute of Space and Astronautical Science, Japan Aerospac

• Mori K

  Cresst And X-ray Astrophysics Laboratory Nasa/gsfc

• Takei Yoh

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Matsuzaki K

  Department Of Applied Physics University Of Miyazaki

• Okuno Shin'ya

  Department Of Physics Kanazawa University

• Yasuda Tatsuki

  Faculty Of Science Kagoshima University

• DOTANI Tadayasu

  Department of High Energy Astrophysics, Institute of Space and Astronautical Science, Japan Aerospac

• MUKAI Koji

  Exploration of the Universe Division, NASA/Goddard Space Flight Center

• Hayashi Takayuki

  Institute Of Space And Astronautical Science/jaxa

• Hayashi Takayuki

  Department Of Electrical Engineering And Computer Science Graduate School Of Engineering Nagoya Univ

• TAKAHASHI Daiki

  Aoyama Gakuin University

• NAIK Sachindra

  Physical Research Laboratory

• MAKISHIMA Kazuo

  Makishima Cosmic Radiation Laboratory, RIKEN

• NAKAMURA Ryoko

  ISAS, JAXA

• HAYASHI Takayuki

  Tokyo Metropolitan University

• Bamba Aya

  Institute Of Space And Astronautical Science Jaxa

• Dotani T

  Institute Of Space And Astronautical Science Jaxa

• Ishida Manabu

  Institute Of Space And Astronautical Science

• Terashima Yuichi

  Institute Of Space And Astronautical Science

• Hayashi Takayuki

  Department Of Physics Tokyo Metroporitan University

• Terada Yukikatsu

  Department Of Physics Saitama University

• Ishikawa Masaki

  Jaxa Ibaraki

• Okada Shunsaku

  Department Of High Energy Astrophysics Institute Of Space And Astronautical Science (isas) Japan Aer

• Terashima Yuichi

  Department Of Physics Nagoya University

• Yamagami T

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Nakamura Ryoko

  Institute Of Space And Astronautical Science / Jaxa

• Okada Shunsaku

  Department Of High Energy Astrophysics Institute Of Space And Astronautical Science Japan Aerospace

• Yamagami Takamasa

  Institute Of Space And Astronautical Science Jaxa.

• Hayashi Takayuki

  Department Of Chemistry Tokyo University Of Science

• Bamba Aya

  Department Of Physics Graduate School Of Science Kyoto University

• Yamamoto Takayuki

  Coordinated Space Observation And Experiment Research Group Institute Of Physical And Chemical Resea

• Ishida Manabu

  Jaxa Kanagawa

• OKADA Shunsaku

  Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)

• DOTANI Tadayasu

  Institute of Space and Astronautical Science, JAXA

• Hayashi Takayuki

  Department of Chemistry Faculty of Literature and Science Yamaguchi University

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