Optical lines in high-redshift quasi-stellar objects - Balmer lines, forbidden O III, and Fe II

Details Optical lines in high-redshift quasi-stellar objects - Balmer lines, forbidden O III, and Fe II Optical lines in high-redshift quasi-stellar objects - Balmer lines, forbidden O III, and Fe II

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l...1h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 1, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

36

Balmer Series, Quasars, Red Shift, Stellar Spectra, Astronomical Spectroscopy, Emission Spectra, Infrared Spectrometers, Spectral Bands

Scientific paper

We present IR spectroscopy of familiar rest-frame optical emission lines in the four bright z is approximately equal to 2.5 QSOs Q0933 + 733, Q1255 + 317, Q1246 - 057, and Q1413 + 117. The spectral regions around H-alpha and around H-beta, including the O III 5007, 4959 A forbidden lines and optical Fe II complexes, were observed with sufficient resolution and sensitivity to allow the deblending of the different features. We discuss the emission-line properties of these QSOs in the context of their lower redshift, lower luminosity counterparts. The rest-frame optical Fe II complexes around H-beta are detected in high redshift QSOs for the first time, and are particularly strong compared to lower redshift objects. Of these QSOs, only Q1413 + 117 shows detectable forbidden O III emission, and this emission is abnormally strong for a broad absorption line QSO. The observation of Q1413 + 117 is the first IR spectrum of a lensed QSO. The Balmer lines have lower equivalent widths than low-redshift, lower-luminosity QSOs, and there is no evidence for reddening.

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