Molecules at early epochs. IV - Confirmation of the detection of H2 toward PKS 0528 - 250

Details Molecules at early epochs. IV - Confirmation of the detection of H2 toward PKS 0528 - 250 Molecules at early epochs. IV - Confirmation of the detection of H2 toward PKS 0528 - 250

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324..267f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 1, 1988, p. 267-278.

Astronomy and Astrophysics

Astrophysics

84

Astronomical Spectroscopy, Emission Spectra, Hydrogen Clouds, Line Spectra, Molecular Spectra, Quasars, Absorption Spectra, Electron Mass, Intergalactic Media, Red Shift

Scientific paper

New spectroscopic observations of the QSO PKS 0528 - 250 obtained with 1 and 5 A resolution are presented. The observed wavelengths of the C IV 1548, 1550 A, and Si IV 1393, 1402 A emission lines yield a reliable determination of the redshift of z(em) = 2.770 + or - 0.005. The absorption system is examined at z(abs) = 2.811 for absorption by molecular hydrogen, and strong evidence is found supporting its existence in the system. The column density is found to be N(H2) = 10 to the 18th/sq cm, the Doppler parameter is 5 km/s, and the excitation temperature is 100 K. A limit of 0.0002 is set on the fractional change of the ratio of the electron to the proton inertial mass over the interval of cosmic time form z = 2.811. The implications of the detection for understanding of the physical process in the absorbing cloud are discussed.

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