Extragalactic HI survey with FAST : First look of the pilot survey results

TL;DR

This paper presents the first data release from a pilot extragalactic HI survey using FAST, detecting 544 galaxies up to redshift 0.04, including 16 new HI sources without known counterparts, and providing a valuable catalog for future observations.

Contribution

It introduces the first data release of a pilot extragalactic HI survey with FAST, extending redshift coverage and identifying new HI sources.

Findings

Detected 544 extragalactic HI sources with S/N > 5.

Extended HI redshift range up to z = 0.04.

Discovered 16 HI sources without known galaxy counterparts.

Abstract

As first data release of a pilot extragalactic HI survey with Five-hundred-meter Aperture Spherical radio Telescope (FAST),we extracted 544 extragalaxies from three-dimensional(3D) spectral data to perform interactive searching and computing, yielding global parameters for these detections, extending redshift ranges of HI 21cm line up to z = 0.04 ,which covers part of the sky region in right ascension(R.A. or $\alpha$) and declination(Dec or $\delta$) range $00^{\rm h} 47^{\rm m}< \rm R.A.(J2000)<23^{\rm h}22^{\rm m}$ and $+24^{\circ}<\rm Dec.(J2000) <+43^{\circ}$ . The S/N of 544 HI detections are greater than 5 flagged with code 1 to 4 based on baseline qualities or RFI contamination. Besides, we find 16 of which without any counterparts in the existing galaxy catalogs. The catalog can give a guidence for the future HI observation with FAST.