J/ApJS/274/18 FAST Ultra-Deep Survey: Data Release for FUDS0 (Xi+, 2024)
FAST Ultra-Deep Survey: Data Release for FUDS0.
Xi H., Peng Bo, Staveley-Smith L., For B.-Q., Liu B., Ding D.
<Astrophys. J. Suppl. Ser., 274, 18 (2024)>
=2024ApJS..274...18X 2024ApJS..274...18X
ADC_Keywords: Galaxies, radio; Radio lines; H I data; Radial velocities
Keywords: H I line emission ; High-redshift galaxies ; High-velocity clouds ;
Galaxy evolution
Abstract:
We have used the Five-hundred-meter Aperture Spherical radio Telescope
(FAST) to conduct a blind ultradeep survey for neutral hydrogen (HI).
We present the complete results from the first of six fields (FUDS0).
These observations of 95hr allowed us to achieve a high-sensitivity
(∼50µJy/beam) and a high-frequency resolution (22.9kHz) over an
area of 0.72deg2. We detected 128 galaxies in HI distributed over
the redshift range of 0<z<0.4, with HI masses in the range of
6.67≤log(MHI/h70-2M☉)≤10.92, and three faint
high-velocity clouds, with a peak column density of
NHI≤3.1x1017cm-2. Of the galaxies, 95 are new detections and
six have z>0.38, where no unlensed HI emission has previously been
directly detected. Estimates of completeness and reliability are
presented for the catalog. The consistency of continuum and HI flux
estimates with the NRAO VLA Sky Survey and the Arecibo Ultra-Deep
Survey, respectively, confirms the accuracy of the calibration method
and data reduction pipeline developed for the full FAST Ultra-Deep
Survey.
Description:
The FAST Ultra-Deep Survey (FUDS) consists of six target fields. In
summary, the FUDS0 field covers 0.72deg2 and was chosen to overlap
with the GAL2577 field of the Arecibo Ultra-Deep Survey (AUDS;
Freudling+ 2011ApJ...727...40F 2011ApJ...727...40F ; Hoppmann+ 2015MNRAS.452.3726H 2015MNRAS.452.3726H and
Xi+ 2021, J/MNRAS/501/4550), which has a similar sensitivity
(∼75uJy/beam) but a smaller redshift coverage (z<0.16). The
observations were taken between 2019 August 25 and 2020 May 22, which
included part of the FAST commissioning phase.
The 500MHz bandwidth (1.0-1.5GHz) was split into 65536 channels,
giving a frequency resolution of 7.63kHz (with an equivalent velocity
resolution of 1.61km/s at z=0). The spectra were recorded with a 1s
integration time. The total observation time was 129hr, consisting of
15hr on the calibrator, 95hr on FUDS0, and 19hr of overhead time (10
minutes are required for FAST to change its observing target).
The Five-hundred-meter Aperture Spherical radio Telescope (FAST), with
its large illuminated diameter (∼300m), multibeam receiver system
(19 beams), and wideband backend (1.0-1.5GHz), is capable of extending
the exploration of HI in galaxies to higher redshifts than Arecibo
--up to z∼0.4 with a reasonable integration time.
Throughout the paper, we use the flat Universe model with parameters
of H0=70h70km.s-1.Mpc-1, ΩM=0.3, and
ΩΛ=0.7.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 94 128 Properties of galaxies in the FUDS0 field
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/73 : HI Parkes All Sky Survey Catalogue (HIPASS) (Meyer+, 2004)
VIII/89 : Northern HI Parkes All Sky Survey Catalogue (HIPASS) (Wong+, 2006)
J/ApJS/119/159 : Deep survey of HI-selected galaxies (Spitzak+, 1998)
J/MNRAS/342/738 : HI Jodrell All Sky Survey (Lang+, 2003)
J/AJ/142/170 : ALFALFA survey: α.40 HI source catalog (Haynes+, 2011)
J/AJ/151/52 : The HIZOA-S survey (Staveley-Smith+, 2016)
J/MNRAS/501/4550 : The complete Arecibo Ultra-Deep Survey (Xi+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- FUDS0 [1/128] FAST Ultra-Deep Survey Release 0
Sequential identifier
5- 6 I2 h RAh [8] Hour of Right Ascension (J2000)
8- 9 I2 min RAm [15/19] Minute of Right Ascension (J2000)
11- 14 F4.1 s RAs Second of Right Ascension (J2000)
16 A1 --- DE- [+] Sign of the Declination (J2000)
17- 18 I2 deg DEd [21/22] Degree of Declination (J2000)
20- 21 I2 arcmin DEm Arcminute of Declination (J2000)
23- 24 I2 arcsec DEs Arcsecond of Declination (J2000)
26- 33 F8.1 km.s-1 cz [2052/120534] Barycentric recessional velocity
35- 38 F4.1 km.s-1 e_cz [0.1/30.4] Uncertainty in cz
40- 43 F4.2 mJy.MHz Sint [0.03/7.1] Integrated flux density weighted
frequency
45- 48 F4.2 mJy.MHz e_Sint [0.01/0.7] Uncertainty in Sint
50- 54 F5.2 mJy Speak [0.08/14.9] Peak Flux density
56- 59 F4.2 mJy e_Speak [0.01/1.5] Uncertainty in Speak
61- 64 F4.2 MHz W20 [0.1/3.1] W20 linewidth
66- 69 F4.2 MHz e_W20 [0.01/0.24] Uncertainty in W20
71- 74 F4.2 MHz W50 [0.07/3] W50 linewidth
76- 79 F4.2 MHz e_W50 [0.01/0.21] Uncertainty in W50
81- 85 F5.2 [-] logMHI [6.6/11] Log, HI Mass, log (M☉/h702)
87- 90 F4.2 [-] e_logMHI [0.04/0.11] Uncertainty in logMHI
92- 94 I3 --- AUDS [97/239]? Arecibo Ultra-Deep Survey (AUDS)
Identifier, in Xi+ 2021, J/MNRAS/501/4550
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Jan-2025