FASHI Data Release 1
Publish Time:2023-12-13
The FAST All Sky HI survey (FASHI) was designed to cover the entire sky observable by the Five-hundred-meter Aperture Spherical radio Telescope (FAST), spanning approximately 22000 square degrees of declination between -14 deg and +66 deg, and in the frequency range of 1050-1450 MHz, with the expectation of eventually detecting more than 100000 HI sources. Between August 2020 and June 2023, FASHI had covered more than 7600 square degrees, which is approximately 35% of the total sky observable by FAST. It has a median detection sensitivity of around 0.76 mJy/beam and a spectral line velocity resolution of ~6.4 km/s at a frequency of ~1.4 GHz. As of now, a total of 41741 extragalactic HI sources have been detected in the frequency range 1305.5-1419.5 MHz, corresponding to a redshift limit of z<0.09. By cross-matching FASHI sources with the Siena Galaxy Atlas (SGA) and the Sloan Digital Sky Survey (SDSS) catalogs, we found that 16972 (40.7%) sources have spectroscopic redshifts and 10975 (26.3%) sources have only photometric redshifts. Most of the remaining 13794 (33.0%) HI sources are located in the direction of the Galactic plane, making their optical counterparts difficult to identify due to high extinction or high contamination of Galactic stellar sources. Based on current survey results, the FASHI survey is an unprecedented blind extragalactic HI survey. It has higher spectral and spatial resolution and broader coverage than the Arecibo Legacy Fast ALFA Survey (ALFALFA). When completed, FASHI will provide the largest extragalactic HI catalog and an objective view of HI content and large-scale structure in the local universe.
· Data access ·
 
.. Table6-The_identified_optical_counterparts_from_the_SDSS_photometric_catalog.csv
806.24 kB
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.. Table5-The_identified_optical_counterparts_from_the_SDSS_spectroscopic_catalog.csv
220.78 kB
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.. Table4-The_identified_optical_counterparts_from_the_SGA_catalog.csv
960.12 kB
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.. Table3-FASHI_and_ALFALFA_cross-matching_catalog.csv
217.20 kB
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.. Table2-FASHI_extragalactic_HI_source_catalog.csv
9.52 MB
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INTRODUCTION
Keywords
surveys , redshifts , galaxies , telescope , radio lines , H I line
Data volume
12.2000 MB 5 files
Sharing method
online
Sharing scope
Public
DOI
10.12149/100875
CSTR
11379.11.100875
VO Identifier
ivo://China-VO/data/FASHI
CONTACT AUTHOR
Author
FASHI Collaboration
Email
cpzhang(at)nao.cas.cn
CONTACT PUBLISHER
Email
support(at)china-vo.org
Phone
+86-10-64807973
Institution
National Astronomical Data Center
RIGHTS
Standard acknowledgement
C.-P. Zhang, M. Zhu, P. Jiang, et al., The FAST all sky H I survey (FASHI): The first release of catalog, Sci. China-Phys. Mech. Astron. 67, 219511 (2024), https://doi.org/10.1007/s11433-023-2219-7
TAGS
waveband
Radio
telescope or project
Five-hundred-meter Aperture Spherical radio Telescope(FAST)
subject
Cosmology and Galaxies
data type
Catalog Data
production age
1980-
content level
Research