Two New Low Redshift 21cm Absorbers

Details Two New Low Redshift 21cm Absorbers Two New Low Redshift 21cm Absorbers

2001-09-19

arxiv.org/abs/astro-ph/0109320v2

Astronomy and Astrophysics

Astrophysics

6 pages incl. 2 figures, accepted for publication in the Astrophysical Journal Letters, missing reference added

Scientific paper

10.1086/324442

As part of a larger program to identify low redshift radio analogues of the damped Lyman-alpha (DLA) absorbers seen in the spectra of high redshift quasars, Westerbork Synthesis Radio Telescope (WSRT) observations have discovered two new HI 21cm absorption lines at z=0.394 and z=0.437 in the spectra of the radio sources B 0248+430 and B 1243-072 respectively. These sightlines and redshifts were selected for study on the basis of the previously known low ionization absorption lines of MgII, and neither has been observed in the Lyman-alpha line. The 21cm line observations provide information on column densities, temperatures and kinematics of the thickest cold neutral clouds in the absorbers.

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