Elemental Abundances and High Redshift Quasars

Details Elemental Abundances and High Redshift Quasars Elemental Abundances and High Redshift Quasars

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003rmxac..17..264d&link_type=abstract

Galaxy Evolution: Theory & Observations (Eds. Vladimir Avila-Reese, Claudio Firmani, Carlos S. Frenk & Christine Allen) Revista

Astronomy and Astrophysics

Astronomy

Quasars: Emission Lines, Elemental Abundances, Quasars: Star Formation History

Scientific paper

We observed the rest frame ultraviolet for 70 high redshift quasars ( z >= 3.5). The fluxes of several ultraviolet emission lines were used to estimate the chemical composition of the line emitting gas and date the first star formation epoch. The line ratios were analysed within the frame work of the most recent photoionization models. We estimated an average abundance of Z/Z[ scriptstyle sun ]= (5.1+/-0.3) of the line emitting gas. Assuming an evolution time scale of ~ 0.5 Gyr, the first violent star formation epoch should start at a redshift of z[f] gtrsim 8 corresponding to an age of the universe of several 10^8 yrs (H [o] =~ 65 km s-1 Mpc^-1, OmegaM() =~ 0.3, OmegaLambda() =~ 0.7). The high redshift quasars provide indications for increasing metallicity towards higher luminosities.

Affiliated with

Also associated with

No associations

Rating

Elemental Abundances and High Redshift Quasars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Elemental Abundances and High Redshift Quasars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elemental Abundances and High Redshift Quasars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1372935