The Lyalpha Forest at Z=2

Details The Lyalpha Forest at Z=2 The Lyalpha Forest at Z=2

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.7002b&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #70.02; Bulletin of the American Astronomical Society, Vol. 26, p.1424

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained moderate resolution ( ~ 80 km/sec FWHM) spectra of the Lyalpha forest towards 40 quasars at z~2.5 with the MMT Blue Spectrograph. This sample complements extensive data at higher redshift obtained from the ground and the low redshift data on the Lyalpha forest obtained by the HST Key Project (Bahcall et al. 1993, 1994). There appears to be a change in both the number and rate of evolution of the Lyalpha clouds between z>2.5 and z<1. This change may indicate a change in the population which is being probed, from clouds on the outskirts of galaxies at low z, to truly primordial intergalactic clouds at high redshift. In addition, our new sample places limits on the ambient EUV background at z~2 where comparison with known sources such as quasars is more straightforward than at higher redshift.

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