Lyman Break Galaxies: Are They Young Spheroids? | Zendy

F. Matteuccí | Zendy; A. Pipino | Zendy

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Lyman Break Galaxies: Are They Young Spheroids?

Author(s) -

F. Matteuccí,

A. Pipino

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/340771

Subject(s) - astrophysics , physics , galaxy , redshift , radius , elliptical galaxy , galaxy formation and evolution , star formation , astronomy , abundance (ecology) , chemical evolution , computer security , computer science , fishery , biology

We have compared the results from a model for the chemical evolution of anelliptical galaxy with initial luminous mass of 2x10^10 M_sun and effectiveradius of 2 kpc with the recent abundance determinations for the Lyman-breakgalaxy MS 1512-cB58 at a redshift z=2.7276. After correcting the iron abundancedetermination for the presence of dust we concluded that the observed [Si/Fe],[Mg/Fe], [N/Fe] are consistent with our model when a galactic age between 20and 35 Myr is assumed. Moreover, the [N/O] ratio also suggests the same age.This age is in very good agreement with other independent studies based on theanalysis of the spectral energy distribution suggesting that this object isyounger than 35 Myr. Therefore, we suggest that MS 1512-cB58 is a truly youngnormal elliptical galaxy experiencing its main episode of star formation andgalactic wind.Comment: 13 pages, 4 figures, ApJ Letters accepte

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