High-resolution spectroscopy of selected absorption lines toward quasi-stellar objects. I - Lyman-alpha toward PHL 957

Details High-resolution spectroscopy of selected absorption lines toward quasi-stellar objects. I - Lyman-alpha toward PHL 957 High-resolution spectroscopy of selected absorption lines toward quasi-stellar objects. I - Lyman-alpha toward PHL 957

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267...12c&link_type=abstract

Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 12-17. NSF-supported research.

Astronomy and Astrophysics

Astronomy

37

Deuterium, Intergalactic Media, Interstellar Gas, Lyman Alpha Radiation, Quasars, Ultraviolet Absorption, Absorption Spectroscopy, Abundance, Cosmology, Gas Temperature, High Resolution, Metallicity, Molecular Clouds, Red Shift, Spectral Line Width, Ultraviolet Astronomy

Scientific paper

The present study of a high-redshift QSO was undertaken with the objective of fully resolving, for the first time, lines in the Ly-alpha forest to set limits on the temperature of intergalactic clouds and to look for suitable candidates for the detection of deuterium. PHL 957 is one of the few bright QSOs in the northern hemisphere with sufficiently high redshift to place Ly-alpha at a wavelength which could be observed easily with the photon-counting Reticon, echelle spectrograph, and image stacker on the Multiple Mirror Telescope. In the study, 90 A (6000 km/s) of the Ly-alpha forest in the spectrum of PHL 957 just shortward of its Ly-alpha emission peak were observed. At the obtained resolution of 12 km/s (FWHM), all four absorption features detected are fully resolved. All four features are identified as Ly-alpha lines arising in intergalactic clouds.

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