K-luminous galaxies at z ~ 2

Details K-luminous galaxies at z ~ 2 K-luminous galaxies at z ~ 2

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329..323d&link_type=abstract

Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present the results from the analysis of the composite spectrum of five near-IR luminous (K < 20) galaxies at z˜2. Several of the strongest absorption lines are present in the UV spectrum of the merging galaxy NGC 6090 and not in the spectra of Lyman Break Galaxies at z˜3. They were identified as Si IIIλ1296, C III λ1428, Si IIλ1485, and Fe ˜λ1380 Å, which are photospheric lines typical of B stars. A metallicity higher than solar is suggested by comparing the pure photospheric lines known as the 1425 Å index (Si III, C III, Fe V) with Starburst99 models. The evidence of high metallicity, together with the high masses, high star-formation rates, and possibly strong clustering, suggest that these galaxies are candidates to become massive spheroids.

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