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    • Soft X-ray variability of the bright quasar 3C273

      Chulhee Kim

      Volume 22 Issue 4 December 2001 pp 283-292

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/022/04/0283-0292

    • Keywords

       

      Galaxies: individual (3C273), quasar; X-rays: galaxies

    • Abstract

       

      We present the results from ROSAT observations of 3C273 in the soft X-ray band. The light variation of 3C273 was investigated for three different energy bands of soft, medium, and hard. The maximum variability with a factor of 2 for 551 days was confirmed at all three different bands. This appears to be a periodic variation within the period of roughly 6 months. However, the short-term or micro variation was not so distinct and the light variation of each band did not show any correlation between them. The hardness ratio for hard and soft bands shows irregular variation but there was no correlation between them. There is no distinct variation of the photon index in the case of simple power law model fitting. For power law + free absorption model fitting, the average photon index (Γ) is 2.08.

    • Author Affiliations

       

      Chulhee Kim1

      1. Department of Earth Science Education, Chonbuk National University, Korea

    • Dates

       
      Published
      December 2001
      Manuscript received
      20 July 2001
      Accepted
      2 November 2001

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