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Ultraviolet spectrum of quasi-stellar object 3C273 (1977)

Hartig, G. F. ; Davidsen, A. F. ; Fastie, W. G.

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Publication Date: 2019-06-27

Description: The first direct observation of the ultraviolet spectrum of a quasi-stellar object (QSO) has been made with a rocket-borne telescope. The emission line spectrum of 3C273 is similar to the spectra of high-redshift QSOs, but no absorption is observed. The results provide important new constraints on theoretical models of QSOs, place a severe limit on the density of neutral hydrogen in the intergalactic medium, and suggest a cosmological origin for much of the absorption seen in high-redshift QSOs. Comparison of the ultraviolet spectrophotometry of low- and high-redshift QSOs suggests that the universe is closed, with a deceleration parameter of about 1.

Keywords: ASTROPHYSICS

Type: Nature; 269; Sept. 15

Format: text

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