Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993rmxaa..26...53h&link_type=abstract
Revista Mexicana de Astronomia y Astrofisica, 26, 53
Astronomy and Astrophysics
Astronomy
4
Scientific paper
RESUMEN Se han observado cuasares con corrimientos al rojo mayores que 4, lo que ofrece una de las pocas formas directas de estudiar las condiciones en los centros de las galaxias durante su evoluci6n temprana. El analisis de las lfneas anchas de emisi6n sugiere que el gas emisor tiene metalicidades muy por arriba de la solar, y que las abundancias de los me tales aumentan con el corrimiento al rojo y la luminosidad. Estas abundancias son similares a las que se infiere existieron en los nucleos de galaxias masivas temprano en su evoluci6n; esto sugiere que los cuasares activos ocurren cerca del fin de la epoca de formaci6n estelar rapida, dominada por estrellas masivas que dieron origen a un medio interestelar enriquecido. ABSTRACT Quasars are now observed to redshifts beyond 4, offering one of the few direct probes of conditions in the centers of galaxies early in their evolution. Analysis of the broad emission lines suggests that the emitting gas often has a metallicity well above solar, and that metal abundances increase with redshift and luminosity. These abundances are similar to those inferred to have existed in the cores of massive galaxies early in their evolution, suggesting that observable quasars occur near the end of the epoch when rapid star formation dominated by massive stars has created an enriched interstellar medium. Key words: GALAXIES - ABUNDANCES QUASARS
Ferland Gary
Hamann Eloise
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