Neutral hydrogen 21 centimeter absorption at Z = 0.6847 toward the 'smallest Einstein ring'

Details Neutral hydrogen 21 centimeter absorption at Z = 0.6847 toward the 'smallest Einstein ring' Neutral hydrogen 21 centimeter absorption at Z = 0.6847 toward the 'smallest Einstein ring'

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412l..59c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 412, no. 2, p. L59-L62.

Astronomy and Astrophysics

Astronomy

79

Gravitational Lenses, Hydrogen, Radio Sources (Astronomy), Absorption Spectra, Astronomical Models, Astronomical Photometry, Astronomical Spectroscopy, Red Shift

Scientific paper

We detect neutral hydrogen 21 cm absorption toward the 'smallest Einstein ring', 0218 + 357, at a redshift of 0.6847. The implied H I column density is N(H I) = 4 x 10 exp 18(Ts/f) cm exp -2, where Ts is the spin temperature of the gas and f is the H I covering factor. The FWHM of the line based on a Gaussian fit is 43 km/s, and the full width to the first null is about 75 km/s. This observation demonstrates a new, potentially powerful method with which to determine lens redshifts in otherwise difficult circumstances. It also allows for the possibility of 'mapping' the gravitational potential of the lens in a way independent of lens models.

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