Small‐Scale Structure at High Redshift. III. The Clumpiness of the Intergalactic Medium on Subkiloparsec Scales | Zendy

Michael Rauch | Zendy; W. L. W. Sargent | Zendy; T. A. Barlow | Zendy; R. F. Carswell | Zendy

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Small‐Scale Structure at High Redshift. III. The Clumpiness of the Intergalactic Medium on Subkiloparsec Scales

Author(s) -

Michael Rauch,

W. L. W. Sargent,

T. A. Barlow,

R. F. Carswell

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/323523

Subject(s) - physics , astrophysics , intergalactic travel , redshift , lyman alpha forest , spectral line , baryon , absorption (acoustics) , amplitude , galaxy , astronomy , intergalactic medium , optics

Spectra from the Keck HIRES instrument of the Lyman alpha forests in thelines of sight to the A and C components of the gravitationally lensed QSOQ1422+231 were used to investigate the structure of the intergalactic medium atmean redshift z = 3.3 on sub-kpc scales. We measured the cross-correlationamplitude between the two Lyman alpha forests for a mean transverse separationof 120 pc, and computed the RMS column density and velocity differences betweenindividual absorption systems seen in both lines of sight. The RMS differencesbetween the velocity centroids of the Lyman alpha forest lines were found to beless than about 400 m/s, for unsaturated absorption lines with column densitiesin the range 12

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