Possible Detection of Super Solar Abundances in Intergalactic Lyman-alpha Forest Clouds

Details Possible Detection of Super Solar Abundances in Intergalactic Lyman-alpha Forest Clouds Possible Detection of Super Solar Abundances in Intergalactic Lyman-alpha Forest Clouds

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.7206b&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #72.06; Bulletin of the American Astronomical Society, Vol. 30, p.928

Astronomy and Astrophysics

Astronomy

Scientific paper

We present two Lyman-alpha forest clouds that either have super solar abundances or contain a local ionizing source with an effective temperature of at least 5 x 10(4) K. The systems were found in high signal-to-noise QSO spectra from Keck+HIRES. The simple, unsaturated H I and C IV profiles show N(C IV)/N(H I) gtrsim 1 in both systems. Both systems are separated from the QSO emission redshifts by over 3 x 10(4) km s(-1) , and have proper C IV doublet ratios which require full covering factors. The resolved H I Lyman-alpha lines constrain the temperatures to T < 1.5 x 10(4) K. The high C IV/H I ratios require super solar abundances if the systems are photoionized by the ultraviolet extragalactic background. The abundances may be subsolar, but that scenario requires a local source of ionization with an effective temperature Teff > 5 x 10(4) K. Either case suggests high star formation at high redshift, the former gives rise to medium-scale (> 100 h(-1) kpc) inhomogeneous metal production and the latter to the presence of very massive stars at high redshift.

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