Early Star Formation Traced by the Highest Redshift Quasars | Zendy

R. Maiolino | Zendy; Yectivani Juárez | Zendy; R. Mújica | Zendy; Neil M. Nagar | Zendy; E. Oliva | Zendy

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Early Star Formation Traced by the Highest Redshift Quasars

Author(s) -

R. Maiolino,

Yectivani Juárez,

R. Mújica,

Neil M. Nagar,

E. Oliva

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/379600

Subject(s) - quasar , astrophysics , redshift , physics , star formation , population , astronomy , galaxy , demography , sociology

The iron abundance relative to alpha-elements in the circumnuclear region ofquasars is regarded as a clock of the star formation history and, morespecifically, of the enrichment by SNIa. We investigate the iron abundance in asample of 22 quasars in the redshift range 3.06. We alsodetect a population of weak iron emitters at z~4.5, which are possibly hostedin systems that evolved more slowly. Alternatively, the trend of the FeII/MgIIratio at high redshift may reflect significantly different physical conditionsof the circumnuclear gas in such high redshift quasars.Comment: Replaced to match the accepted version (ApJL in press), 5 page

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