Blind Search for 21-cm Absorption Systems in New Generation Chinese Radio Telescopes

Abstract

Neutral hydrogen clouds are known to exist in the Universe, however their spatial distributions and physical properties are poorly understood. Such missing information can be studied by the new generation Chinese radio telescopes through a blind searching of 21-cm absorption systems. We forecast the capabilities of surveys of 21-cm absorption systems by two representative radio telescopes in China -- Five-hundred-meter Aperture Spherical radio Telescope (FAST) and Tianlai 21-cm cosmology experiment (Tianlai). Facilitated by either the high sensitivity (FAST) or the wide field of view (Tianlai) of these telescopes, more than a thousand 21-cm absorption systems can be discovered in a few years, representing orders of magnitude improvement over the cumulative discoveries in the past half a century.

4 pages. Accepted for publication in Research in Astronomy and Astrophysics

References in corpus (4)

• The Tianlai project: a 21cm cosmology experiment
• The Five-hundred-meter Aperture Spherical Radio Telescope (FAST) Project
• Discovery of HI gas in a young radio galaxy at $z=0.44$ using the Australian Square Kilometre Array Pathfinder
• New HI 21-cm absorbers at low and intermediate redshifts

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• Toward a direct measurement of the cosmic acceleration: the first preparation with FAST
• Extragalactic HI 21-cm absorption line observations with the Five-hundred-meter Aperture Spherical radio Telescope
• Detections of 21-cm absorption with a blind FAST survey at z $⩽$ 0.09
• Unveiling the emission properties of three long-period pulsars using FAST
• Statistical distribution of HI 21cm intervening absorbers as potential cosmic acceleration probes
• Revealing the Unseen: The Discovery of Long-Awaited Radiation from the Intermittent Pulsar PSR B1931+24