English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present observations of the Lyman alpha forest towards B2 1225+317 takenat a resolution of 18 km/s. A clean sample of Lyman alpha forest lines isextracted after a careful profile fitting analysis and removal of absorptionlines of heavy elements. The sample is analyzed for statistical properties.Eighty percent of the column densities are < 10^{14} cm^{-2}. A single powerlaw is inconsistent with the column density distribution and a steepening/breakin the distribution is indicated. The average velocity dispersion parameter is29.4 km/s. We find 3 sigma evidence for a correlation between column densityand the velocity dispersion parameter. The correlation, however, is mainly dueto narrow lines and weakens to 1.2 sigma if lines with velocity dispersionparameter smaller than 20 km/s are excluded. An excess of line pairs withvelocity separation $\le$ 100 km/s over the expected number is found.Comment: latex(mn.sty), 6 figures (available on request from  anand@iucaa.ernet.in or khare@iopb.ernet.in), to appear in MNRA

The Lyman alpha forest towards B2 1225 + 317