J/ApJS/278/37 FAST Ursa Major Supergroup HI survey (FUMaS) (Yu+, 2025)
The FAST Ursa Major Supergroup HI survey (FUMaS): catalog and HI mass function.
Yu H., Zhu M., Zhang C.-P., Jiang P., Xu J.-L.
<Astrophys. J. Suppl. Ser., 278, 37 (2025)>
=2025ApJS..278...37Y 2025ApJS..278...37Y
ADC_Keywords: Galaxies, group; Clusters, galaxy; H I data; Radial velocities;
Cross identifications; Optical
Keywords: Catalogs ; Surveys ; Galaxy clusters ; H I line emission ;
Extragalactic radio sources
Abstract:
Using the Five-hundred-meter Aperture Spherical radio Telescope, we
have performed an Ursa Major supergroup HI survey covering the entire
UMa region centered at RA=11:59:28.3,DE=49:05:18 with a radius of
7.5°. We have obtained the most complete catalog of HI sources in
the UMa supergroup, containing 178 HI sources with velocities in the
range 625-1213.4km/s and masses in the range 106.0-1010.1M☉
assuming a distance of 17.4Mpc. Among them, 55 HI sources were
detected for the first time, of which 32 do not have known optical
redshifts. For these 32 sources, we have searched the DESI Legacy
Surveys and found optical counterparts for 25 of them (with optical
images, but no redshifts), with the remaining seven sources being pure
HI clouds without an optical counterpart. We detected HI distributions
in some interacting systems and discussed four small groups in detail.
We computed the neutral hydrogen mass function (HI MF) of the UMa
supergroup using the 1/Vmax method and fitting it with the nonlinear
least-squares (NLLS) and modified maximum likelihood (MML) methods. We
obtained the following HI MF parameters:
log10(φ*/Mpc-3)=-0.78±0.15, α=-1.05±0.07, and
log10(M*/M☉)=9.87±0.19 for the NLLS method, and
log10(φ*/Mpc-3)=-0.70±0.11, α=-1.05±0.05, and
log10(M*/M☉)=9.77±0.13 for the MML method. This result is
similar to that derived from the Very Large Array blind survey, but
the slope is steeper because we detected more low-mass galaxies. The
slope is flatter than that of the global HI MF, which agrees with the
theoretical prediction that galaxies in high-density regions are
stripped of gas due to interactions.
Description:
The data used in this paper come from observations made by the
Five-hundred-meter Aperture Spherical radio Telescope (FAST) All Sky
HI survey (FASHI, Zhang+ 2024, J/other/SCPMA/67.19511) project of the
FAST in 2021-2023 and additional observations in 2024-January.
FAST is a single-dish radio telescope with an aperture of 500m and an
illuminating aperture of 300m located in Guizhou, China. It has a
zenith angle (ZA) of up to 40°, so it can observe over a range of
declinations from -14.4 to 65.6°, and covers a frequency range of
1050-1450MHz.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 182 146 FUMaS HI source with known-redshift optical
counterpart catalog
table2.dat 177 32 FUMaS HI source without known-redshift optical
counterpart catalog
--------------------------------------------------------------------------------
See also:
VII/238 : HYPERLEDA. II. Homogenized HI data (Paturel+, 2003)
VIII/73 : HI Parkes All Sky Survey Catalogue (HIPASS) (Meyer+, 2004)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/AJ/112/2471 : The Ursa Major cluster. I. (Tully+ 1996)
J/A+A/370/765 : HI synthesis observations in UMa cluster (Verheijen+, 2001)
J/AJ/128/16 : HIPASS Bright Galaxy Catalog (Koribalski+, 2004)
J/AJ/138/338 : Arecibo Legacy Fast ALFA Survey. IX. (Stierwalt+, 2009)
J/MNRAS/428/1790 : HIJASS HI survey in the Ursa Major region (Wolfinger+, 2013)
J/MNRAS/445/630 : Early-type galaxies in Ursa Major cluster (Pak+, 2014)
J/MNRAS/447/1531 : HI data collection update (Courtois+, 2015)
J/A+A/592/A94 : Radio continuum and gas reservoir in NGC 3998 (Frank+, 2016)
J/A+A/595/A118 : NIBLES. I. The Nancay HI survey (van Driel+, 2016)
J/ApJ/861/49 : ALFALFA extragalactic HI source catalog (Haynes+, 2018)
J/AJ/157/194 : ALFALFA H I fluxes for extended sources (Hoffman+, 2019)
J/MNRAS/494/2090 : Group galaxies in ALFALFA survey (Jones+, 2020)
J/A+A/659/A14 : HI observations of the MATLAS dwarfs (Poulain+, 2022)
J/AJ/165/263 : Searching in HI for LSB Galaxies (O'Neil+, 2023)
J/ApJS/267/27 : SMUDGes V. Complete cat. of UDGs from DR9 (Zaritsky+, 2023)
Byte-by-byte Description of file: table[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [FUMa]
6- 8 I03 --- FUMa FUMaS name
10- 12 A3 --- f_FUMa Flag(s) on name (1)
14- 15 I2 h RAh [11/12] Hour of Right ascension (J2000)
17- 18 I2 min RAm Minute of right ascension (J2000)
20- 24 F5.2 s RAs Second of right ascension (J2000)
26 A1 --- DE- [+] Sign of declination (J2000)
27- 28 I2 deg DEd [42/56] Degree of declination (J2000)
30- 31 I2 arcmin DEm Arcminute of declination (J2000)
33- 36 F4.1 arcsec DEs Arcsecond of declination (J2000)
38- 41 F4.1 arcsec e_Pos [0.7/65.2] Position uncertainty
43- 49 F7.2 km.s-1 HRV [624.9/1213.4] Heliocentric radial velocity
51- 54 F4.2 km.s-1 e_HRV [0.02/1.9] HRV uncertainty
56- 61 F6.2 km.s-1 W50 [3.36/583.7] Velocity width at 50% of the
peak intensity
63- 66 F4.2 km.s-1 e_W50 [0.04/3.7] W50 uncertainty
68- 73 F6.2 km.s-1 W20 [21.9/692.1] Velocity width at 20% of the
peak intensity
75- 78 F4.2 km.s-1 e_W20 [0.06/5.5] W20 uncertainty
80- 85 F6.1 mJy Fp [0.8/1098] Peak intensity
87- 93 F7.3 Jy.km.s-1 Sbf [0.015/176.6] Integrated flux density by
busy-function
95-101 F7.3 Jy.km.s-1 Ssum [0.01/177.1] Integrated flux density by sum
103-107 F5.3 Jy.km.s-1 e_Sbf [0.006/0.7] Integrated flux density
uncertainty
109-112 F4.1 mJy rms [0.3/10.4] Root mean square noise
114-119 F6.1 --- snr [4.8/1110] Signal-to-noise ratio
121-124 F4.1 Msun logMHI [6/10.1] HI mass
126-128 F3.1 Msun e_logMHI [5.6/7.7] HI mass uncertainty
130-153 A24 --- OName Optical counterpart name
155-156 I2 h RAOh [11/12]? Hour of optical right ascension
(J2000)
158-159 I2 min RAOm ? Minute of optical right ascension (J2000)
161-165 F5.2 s RAOs ? Second of optical right ascension (J2000)
167 A1 --- DEO- [+]? Sign of optical declination (J2000)
168-169 I2 deg DEOd [42/56]? Degree of optical declination
(J2000)
171-172 I2 arcmin DEOm ? Arcminute of optical declination (J2000)
174-177 F4.1 arcsec DEOs ? Arcsecond of optical declination (J2000)
179-182 I4 km/s OHRV [569/1217]? Optical heliocentric radial
velocity (only for Table 1)
--------------------------------------------------------------------------------
Note (1): Flags as follows:
n = newly detected HI source;
c = HI cloud;
f = FASHI DR1 source (see Zhang+ 2024, J/other/SCPMA/67.19511).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Feb-2026