Spectroscopy of spatially extended material around high-redshift radio-loud quasars

Details Spectroscopy of spatially extended material around high-redshift radio-loud quasars Spectroscopy of spatially extended material around high-redshift radio-loud quasars

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381..373h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 10, 1991, p. 373-385. Research supported by NATO.

Astronomy and Astrophysics

Astronomy

66

Quasars, Radio Sources (Astronomy), Red Shift, Astronomical Spectroscopy, Lyman Alpha Radiation, Nebulae, Radio Galaxies, Spectral Line Width

Scientific paper

Long-slit optical spectra taken of five high-redshift (about 2-3) radio-loud quasars (QSRs) selected from the imaging survey of Heckman et al. (1991) are analyzed. It is confirmed that the QSRs have Ly-alpha emission that is spatially extended by at least several tens of kiloparsecs, with a luminosity of order 10 exp 44 ergs/s. The line widths in the nebulae are 100-1500 km/s and are close to the maximum possible for gas that is freely falling into the potential well of a very massive galaxy. The gas does not show any globally organized velocity gradients. The suggestion of Foltz et al. (1988) that the nuclear He II 1640 emission line in QSRs is systematically narrower than other nuclear emission lines is confirmed. This narrow-lined nuclear He II emission is found to have a strength that correlates with the strength of the spatially extended Ly-alpha emission, and it is suggested that the former probably arises in the inner part of the Ly-alpha nebula. The implications of these results for the nature of the z(abs) is approximately equal to z(em) systems in high-redshift QSRs are discussed.

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