Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...299..382w&link_type=abstract
Astronomy and Astrophysics, v.299, p.382
Astronomy and Astrophysics
Astrophysics
103
Interstellar Medium: Molecules, Galaxies: B0218+357, Ism, Radio Continuum: Galaxies, Radio Lines: Galaxies, Gravitational Lensing
Scientific paper
Absorption lines of CO(1-2), CO(2-3), HCO^+^(1-2) and HCN(1-2) have been detected at a redshift of z_a_=0.68466 towards the background BLLac object B0218+357. The CO and HCN lines are strongly saturated, while the HCO^+^ line is mildly saturated. Lower limits to the column densities are (7.0+/-0.3)x10^16^/cm^2^ for CO, (7.4+/-0.2)x10^13^/cm^2^ for HCO^+^ and (1.4+/-0.1)x10^14^/cm^2^ for HCN. The filling factor for the background source is larger than 0.7-0.8. The absorption line profile is asymmetric with a width of ~30km/s. B0218+357 is a gravitational lens candidate with two compact continuum sources separated by 335mas (1.8kpc). The small linewidth of the molecular absorption puts constraints on the inclination and position angle of the lensing galaxy. We also report a search for QSOs molecular absorption lines in 12 other redshifted systems; none were detected.
Combes François
Wiklind Thomas
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