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

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 $00^{\mathrm{h}}47^{\mathrm{m}}<R.A.(J2000)<23^{\mathrm{h}}22^{\mathrm{m}}$ and $+24^{\circ }<Dec.(J2000)<+43^{\circ }$ . 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.

23 pages,17 figures, 4 tables. Accepted for publication in the Research in Astronomy and Astrophysics

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• Toward a direct measurement of the cosmic acceleration: The pilot observation of H I 21cm absorption line at FAST
• Toward Understanding the Evolutionary Role of Star-forming Lenticular Galaxies: New HI Detections and Comparison with Quiescent S0s and Red Spirals