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    • Keywords


      Galaxies; quasars; absorption lines

    • Abstract


      We have analysed a large, homogeneous sample of Lyman alpha lines, observed at intermediate resolution, using the maximum likelihood method. The analysis shows that the evolutionary index γ, is a function of rest equivalent width with stronger lines evolving faster. The mean equivalent width increases with redshift. This behaviour is similar to that exhibited by the heavy element absorption lines in the quasar spectra.

    • Author Affiliations


      M. Acharya1 Pushpa Khare2

      1. Department of Physics, College of Basic Sciences and Humanities, Orissa, University of Agriculture and Technology, Bhubaneswar - 751 003
      2. Physics Department, Utkal University, Bhubaneswar - 751 004
    • Dates

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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