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NICMOS Spectra of z~6 Quasars I ESA Press Release HEIC0306

NICMOS Spectra of z~6 Quasars I ESA Press Release HEIC0306. Observations at z~6, the Fe II bands are shifted to 1.5 to 1.9 m NICMOS has unique capability to observe spectra in this band QSOs at H~19 can easily reached with NICMOS grism G141

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NICMOS Spectra of z~6 Quasars I ESA Press Release HEIC0306

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  1. NICMOS Spectra of z~6 Quasars I ESA Press Release HEIC0306 • Observations • at z~6, the Fe II bands are shifted to 1.5 to 1.9 m • NICMOS has unique capability to observe spectra in this band • QSOs at H~19 can easily reached with NICMOS grism G141 • Technically challenging since pixel-response introduces features similar to such a broad band. Characterization of this effect and software to correct for it (NICMOSlook) has been developed at ST-ECF. • Results • High Fe II / Mg II ratios detected in all spectra, no evolution from local QSOs • at z~6, age of universe < 900Myrs • implies that Fe was either created in Population III stars or first generation of Population II stars.

  2. NICMOS Spectra of z~6 Quasars II  Wolfram Freudling and European Space Agency black:NICMOS spectrared: local QSO template Fe II / Mg II flux ratios for QSOs at z=5 to 6.28 Freudling, Corbin, Korista 2003 ApJ 587, L67 Solar ratio

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