J/other/SCPMA/67.19511 The FAST all sky H I survey (FASHI) (Zhang+, 2024)
The FAST all sky H I survey (FASHI): The first release of catalog.
Zhang C.-P., Zhu M., Jiang P., Cheng C., Wang J., Wang J., Xu J.-L.,
Liu X.-L., Yu N.-P., Qian L., Yu H., Ai M., Jing Y., Xu C., Liu Z.,
Guan X., Sun C., Yang Q., Huang M., Hao Q., FAST Collaboration
<Sci. China-Phys. Mech. Astron., 67, 219511 (2024)>
=2024SCPMA..6719511Z 2024SCPMA..6719511Z (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; H I data ; Galaxies, radio ; Redshifts ; Optical
Keywords: catalogs - galaxies: distances and redshifts -
methods: data analysis - radio lines: galaxies - surveys -
techniques: imaging spectroscopy
Abstract:
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° and +66°, and in the frequency range
of 1050-1450MHz, 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 0.76mJy/beam and a spectral line velocity
resolution of ∼6.4km/s at a frequency of ∼1.4GHz. As of now, a total
of 41741 extragalactic HI sources have been detected in the frequency
range 1305.5-1419.5MHz, 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.
Description:
The FASHI project aims to observe the entire detectable sky of the FAST in
the declination range of -14deg to +66deg at a frequency between 1050 and
1450 MHz. The first data release of the FASHI project mainly concentrates
on extragalactic areas that lie predominantly outside the observable regions
of the Arecibo telescope. Between August 2020 and June 2023, the FASHI
project observed an approximate area of 7600 square degree of the sky
and detected 41741 extragalactic HI sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 267 41741 FASHI extragalactic HI source catalog
table3.dat 63 3620 FASHI and ALFALFA cross-matching catalog
table4.dat 81 14072 The identified optical counterparts from
the SGA (Siena Galaxy Atlas) catalog
table5.dat 77 2900 The identified optical counterparts from the
SDSS DR7 spectroscopic catalog
table6.dat 75 10975 The identified optical counterparts from the
SDSS DR7 photometric catalog
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See also:
II/294 : The SDSS Photometric Catalog, Release 7
J/AJ/142/170 : ALFALFA survey: the α.40 HI source catalog (Haynes+, 2011)
J/ApJ/861/49 : ALFALFA extragalactic HI source catalog (Haynes+, 2018)
https://www.legacysurvey.org/sga/sga2020 : SGA home page
https://fast.bao.ac.cn : FAST Home Page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 I11 --- FASHI Unique index number for each FASHI
extragalactic source
13- 31 A19 --- Name Name (JHHMMSS.ss+DDMMSS.s)
33- 40 F8.4 deg RAdeg Right ascension (J2000) of FASHI source
centroid
42- 48 F7.4 deg DEdeg Declination (J2000) of FASHI source centroid
50- 55 F6.4 deg ePos Positional error
57- 64 F8.2 km/s cz Heliocentric velocity
66- 69 F4.2 km/s e_cz Heliocentric velocity error
71- 78 F8.2 km/s b_cz Lower value of heliocentric velocity interval
80- 87 F8.2 km/s B_cz Upper value of heliocentric velocity interval
89- 96 F8.2 km/s vradio Radio-defined velocity
98-101 F4.2 km/s e_vradio Radio-defined velocity error
103-111 F9.4 MHz Freq Spectral line central frequency
113-118 F6.4 MHz e_Freq Spectral line central frequency error
120-127 F8.6 --- z Redshift
129-136 F8.6 --- e_z Redshift error
138-141 F4.1 arcmin Ellmaj Ellipse major axis (1)
143-146 F4.1 arcmin Ellmin Ellipse minor axis (1)
148-150 I3 deg EllPA Ellipse position angle (1)
152-157 F6.2 km/s W50 Velocity width of the HI line profile,
measured at 50% level of every peak
159-163 F5.2 km/s e_W50 Velocity width of the HI line profile,
measured at 50% level error
165-170 F6.2 km/s W20 Velocity width of the HI line profile,
measured at 20% level of every peak
172-176 F5.2 km/s e_W20 Velocity width of the HI line profile,
measured at 20% level error
178-185 F8.2 mJy Fpeak HI line flux intensity at the peak of
integrated spectrum
187-191 F5.2 mJy e_Fpeak HI line flux intensity at the peak error
193-202 F10.2 mJy.km/s Sbf Integrated HI line flux density
204-210 F7.2 mJy.km/s e_Sbf Integrated HI line flux density error
212-221 F10.2 mJy.km/s Ssum Integrated HI line flux density by summing
all velocity channels containing signal
223-229 F7.2 mJy.km/s e_Ssum Integrated HI line flux density by summing
all velocity channels containing signal
error
231-235 F5.2 --- rms rms noise
237-243 F7.2 --- SNR Sinagl-to-noise ratio of the detection
245-250 F6.2 Mpc Dist Distance
252-256 F5.2 Mpc e_Dist Distance error
258-262 F5.2 [Msun] logMass HI mass
264-267 F4.2 [Msun] e_logMass HI mass error
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Note (1): The ellipse indicates the measurement aperture of the integrated
source in RA and DEC space for estimating the source flux.
It does not represent the properties of the galaxy.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 I11 --- FASHI FASHI identification number
13- 19 F7.3 deg RAdeg FASHI right ascension (J2000)
21- 26 F6.3 deg DEdeg FASHI declination (J2000)
28- 35 F8.2 km/s cz FASHI heliocentric velocity
37- 42 I6 --- AGC ALFALFA AGC identification number
44- 50 F7.3 deg RAAdeg ALFALFA right ascension (J2000)
52- 57 F6.3 deg DEAdeg ALFALFA declination (J2000)
59- 63 I5 km/s czA ALFALFA heliocentric velocity
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 11 I11 --- FASHI FASHI identification number
13- 19 F7.3 deg RAdeg FASHI right ascension (J2000)
21- 26 F6.3 deg DEdeg FASHI declination (J2000)
28- 34 F7.5 --- z FASHI heliocentric redshift
36- 58 A23 --- SGA SGA identifier
60- 66 F7.3 deg RASdeg SGA right ascension (J2000)
68- 73 F6.3 deg DESdeg SGA declination (J2000)
75- 81 F7.5 --- zS SGA heliocentric redshift
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Byte-by-byte Description of file: table5.dat table6.dat
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Bytes Format Units Label Explanations
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1- 11 I11 --- FASHI FASHI identification number
13- 19 F7.3 deg RAdeg FASHI right ascension (J2000)
21- 26 F6.3 deg DEdeg FASHI declination (J2000)
28- 34 F7.5 --- z FASHI heliocentric redshift
36- 54 I19 --- objid SDSS objid
56- 62 F7.3 deg RASdeg SDSS right ascension (J2000)
64- 69 F6.3 deg DESdeg SDSS declination (J2000)
71- 77 F7.5 --- zS SDSS heliocentric redshift
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Acknowledgements:
Chuan-Peng Zhang, cpzhang(at)nao.cas.cn
(End) Patricia Vannier [CDS] 16-Jan-2024