Investigation of CTA 1 using a Suzaku observation

Lupin C.C. Lin, Jumpei Takata, Albert K.H. Kong, C. Y. Hui, Teruaki Enoto, H. K. Chang, Regina H.H. Huang, J. S. Liang, Shinpei Shibata, C. Y. Hwang

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3 Scopus citations


We report on a 105-ks Suzaku observation (obsid 404011010 with J. Takata as PI) of the supernova remnant CTA 1 (G119.5+10.2). The Suzaku soft X-ray observation was carried out using both the timing and imaging modes.A∼10-arcmin extended feature, which is interpreted as a bow-shock component of the pulsar wind nebula, is revealed in this deep observation for the first time. The nebular spectrum can be modelled by a power law with a photon index of∼1.8, which suggests a slow synchrotron cooling scenario. The photon index is approximately constant across this extended feature. We compare our observations of this complex nebula with previous X-ray investigations, and we discuss our findings. We do not obtain any significant pulsation from the central pulsar in the soft (0.2-12 keV) and hard (10-60 keV) X-ray data. The non-detection is mainly a result of the loss of the precise imaging ability to accurately determine the source contribution. The spectra from the X-ray imaging spectrometer and the hard X-ray detector can be directly connected without a significant spectral break, according to our analysis. Future observations by the Nuclear Spectroscopic Telescope Array (NuSTAR) and Astro-H might be able to resolve the contamination and provide an accurate hard X-ray measurement of CTA 1.

Original languageEnglish
Pages (from-to)2283-2290
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - 1 Nov 2012


  • ISM: Supernova remnants
  • Pulsars: general
  • Stars: winds, outflows
  • Time
  • X-rays: general


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