Constraints on the gas masses of low-z damped Lyman α systems

  title={Constraints on the gas masses of low-z damped Lyman $\alpha$ systems},
  author={Parichay Mazumdar and Nissim Kanekar and J. Xavier Prochaska St. Stephen's College and India. and National Centre for Radio Astrophysics and UCOLick Observatory and Usa},
  journal={Monthly Notices of the Royal Astronomical Society},
We report a deep search for redshifted Hi 21cm emission from three damped and sub-damped Lyman-α absorbers (DLAs) at z≈ 0.1 with the Green Bank Telescope (GBT). No evidence for a redshifted Hi 21cm emission signal was obtained in the GBT spectra of two absorbers, with the data on the third rendered unusable by terrestrial i nterference. The non-detections of Hi 21cm emission yield strong constraints on the Hi masses of the associated galaxies, MHI< 2.3× 10 9 × (�V/100) 1/2 M⊙ for the sub-DLA at… 

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