Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256..374s&link_type=abstract
Astrophysical Journal, Part 1, vol. 256, May 15, 1982, p. 374-385.
Astronomy and Astrophysics
Astrophysics
92
Absorption Spectra, Astronomical Spectroscopy, Lyman Alpha Radiation, Quasars, Red Shift, Autocorrelation, Cross Correlation, Emission Spectra, Intergalactic Media
Scientific paper
Spectra of Q1623+269 and Q1623+268 were obtained and these objects were confirmed as QSO's with redshifts about 2.5. The separation of only 2.9 arcmins corresponds at redshift 2.5 to a projected linear separation on the plane of sky of only 1-2 Mpc. It is shown in detail that the corresponding differential Hubble velocity over 1-2 Mpc at redshift 2.5 is about 400 km/s. Thus, a study of the redshift distribution of the Lyman alpha absorption lines in these two objects is capable of giving information on the clustering of the Lyman alpha clouds on linear scales of 1-2 Mpc or velocity scales of about 400 km/s. Lists are derived of observed absorption lines for each QSO, and the distribution of Lyman alpha lines is considered. It is shown how cross-correlation and autocorrelation analyses of the Lyman alpha absorption line positions may be used to study the clustering of the clouds responsible for the lines.
Sargent Wallace L. W.
Schneider David P.
Young Patrick
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