Constraints on the gas masses of low-z damped Lyman-$\alpha$ systems

Abstract

We report a deep search for redshifted HI 21 cm emission from three damped and sub-damped Lyman-$\alpha$ absorbers (DLAs) at $z\approx 0.1$ with the Green Bank Telescope (GBT). No evidence for a redshifted HI 21 cm emission signal was obtained in the GBT spectra of two absorbers, with the data on the third rendered unusable by terrestrial interference. The non-detections of HI 21 cm emission yield strong constraints on the HI masses of the associated galaxies, M${}_{\mathrm{HI}}<2.3\times 10^9\times (\Delta V/100{)}^{1/2}$ M${}_{\odot }$ for the sub-DLA at $z=0.0830$ towards J1553+3548, and M${}_{\mathrm{HI}}<2.7\times 10^9\times (\Delta V/100{)}^{1/2}$ M${}_{\odot }$ for the DLA at $z=0.0963$ towards J1619+3342, where $\Delta V$ is the HI 21 cm line width, in km s${}^{-1}$. This continues the trend of low HI masses found in all low-$z$ DLAs and sub-DLAs that have been searched for redshifted HI 21 cm emission. Low-redshift absorbers with relatively low HI column densities, $\lesssim few\times 10^{20}$ cm${}^{-2}$, thus do not typically arise in massive gas-rich galaxies.

arXiv comment5 pages, 4 figures; accepted for publication in MNRAS (Letters). Minor changes and added reference, to match the final version

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Cited by in corpus (3)

• ALMA + VLT observations of a Damped Lyman-α absorbing galaxy: Massive, wide CO emission, gas-rich but with very low SFR
• The gas and stellar mass of low-redshift damped Lyman-$\alpha$ absorbers
• HI 21cm emission from the sub-damped Lyman-alpha absorber at z=0.0063 towards PG1216+069