Large size of Lyman-α gas clouds at intermediate redshifts

Nadine Dinshaw, Chris D. Impey, Craig B. Foltzt, Ray J. Weymanni, Simon L. Morris

Research output: Contribution to journalLetterpeer-review

5 Scopus citations


THE Lyman-α absorption lines observed in the spectra of quasars are thought to be caused by intervening clouds of atomic hydrogen, the origin and physical nature of which are still unknown. These clouds might be structures confined by the pressure of the surrounding intergalactic medium1, relicts of density fluctuations in the early Universe2, gravitationally bound clouds associated with condensations of cold dark matter3 or the result of shocks owing to galaxy formation4. Here we present ultraviolet spectra of the quasar pair Q0107 - 025A and B, in which we detect four Lyman-α lines common to both spectra in the redshift range 0.5 < z < 0.9. These common lines indicate that the characteristic radius of the clouds has a lower limit of 160h-1 kpc, where h is the Hubble constant in units of 100 km s-1 Mpc-1. The typical velocity difference between the common absorption lines along the two lines of sight is only about 100 km s-1. The clouds are larger in extent and have smaller internal motions than can be explained by any current model.

Original languageEnglish (US)
Pages (from-to)223-225
Number of pages3
Issue number6511
StatePublished - Jan 19 1995

ASJC Scopus subject areas

  • General


Dive into the research topics of 'Large size of Lyman-α gas clouds at intermediate redshifts'. Together they form a unique fingerprint.

Cite this