J/ApJS/281/66 HI dwarf galaxies in FASHI with DECaLS DR9 phot. (Cheng+, 2025)
H I-detected dwarf galaxies in the FASHI survey: insights from single- and
double-peaked emission-line samples.
Cheng C., Huang J.-S., Du W., Zhang H.-X., Zhang C.-P., Zhu M.,
Orellana G.
<Astrophys. J. Suppl. Ser., 281, 66 (2025)>
=2025ApJS..281...66C 2025ApJS..281...66C
ADC_Keywords: Galaxies, dwarf; H I data; Surveys; Redshifts; Photometry;
Optical; Galaxies, radius
Keywords: Dwarf galaxies ; Dwarf elliptical galaxies ; Galaxy formation ;
Galaxy dark matter halos ; Cold neutral medium ; Radio spectroscopy
Abstract:
We present a sample of low HI mass (MHI<108M☉) dwarf
galaxies detected by The FAST All Sky HI Survey (FASHI) project. Due
to the faint and irregular morphology of these galaxies, the default
photometry is often inaccurate. Therefore, we utilized The Dark Energy
Camera Legacy Survey data to perform careful photometric measurements,
and find that the low HI mass galaxies have similar stellar mass
densities to dwarf elliptical galaxies. Compared to other dwarf galaxy
populations, the HI-selected dwarfs exhibit higher stellar mass
densities than ultradiffuse galaxies, and similar densities to
HI-selected low-surface-brightness galaxies, albeit with lower stellar
masses, suggesting a possible evolutionary connection among these
populations. By classifying the galaxies according to their HI
spectral-line profiles, we show that the double-peaked sources conform
closely to the Tully-Fisher relation, whereas the single-peaked
sources follow the Faber-Jackson relation but with large scatter. This
indicates that the single-peaked systems are likely dispersion
dominated and that the relationship between stellar mass and halo mass
in such systems may remain consistent across both low- and high- mass
regimes. These findings suggest that HI-selected dwarf galaxies with
single-peaked HI profiles may share a similar dynamical state with
massive ellipticals, offering new insights into their structural
evolution and the diversity of formation pathways for low-mass galaxies.
Description:
FASHI (Zhang+ 2024, J/other/SCPMA/67.19511) is (to date) the largest
HI blind survey conducted with the Five-hundred-meter Aperture
Spherical radio Telescope (FAST). It covers approximately 7600deg2
with an rms sensitivity of about 0.5mJy. The first data release (DR1)
catalog contains over 40,000 HI-bright sources within a redshift of
z<0.08.
In this study, we focus on a sample of dwarf galaxies with
MHI<108M☉, selected from the FASHI DR1 catalog.
By combining DECaLS DR9 images in the g and r bands, we can identify
the optical counterparts of HI-selected low-mass galaxies and estimate
their basic properties.
Throughout this paper, we assume a standard ΛCDM cosmology with
H0=70km/s/Mpc, 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 71 351 Catalog of optical counterparts for the low HI mass
sample
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See also:
VII/292 : DESI Legacy Imaging Surveys DR8 photometric redshifts (Duncan, 2022)
J/A+A/324/877 : HI data for spiral and irregular galaxies (Broeils+, 1997)
J/A+AS/127/409 : Nearby dwarf galaxy candidates list (Karachentseva+ 1998)
J/A+A/377/801 : Fourth list of the Karachentsev catalog (Huchtmeier+, 2001)
J/ApJS/153/223 : ACS Virgo Cluster Survey. I. (Cote+, 2004)
J/ApJS/161/304 : Star clusters in the MW and satellites (McLaughlin+, 2005)
J/ApJS/164/334 : ACS Virgo Cluster Survey. VI (Ferrarese+, 2006)
J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008)
J/A+A/486/697 : Hydra I Cluster Catalogue (HCC) (Misgeld+, 2008)
J/AJ/138/1037 : Star formation in Centaurus A Group dwarfs (Cote+ 2009)
J/ApJS/180/54 : Gcl candidates in ACS Virgo survey. (Jordan+, 2009)
J/ApJS/182/216 : Surface photometry of Virgo ellipticals (Kormendy+, 2009)
J/A+A/496/683 : Early-type gal. in the Centaurus cluster (Misgeld+, 2009)
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
J/MNRAS/414/3699 : Study of hot stellar systems and galaxies (Misgeld+, 2011)
J/AJ/143/133 : Dwarf galaxies from the ALFALFA survey (Huang+, 2012)
J/ApJS/203/24 : Structural param. of gal. in CANDELS (van der Wel+, 2012)
J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)
J/A+A/587/L3 : HI datacubes if Pisces A and B (Carignan+, 2016)
J/AJ/152/157 : Mass models for 175 disk galaxies with SPARC (Lelli+, 2016)
J/ApJ/816/L14 : Tully-Fisher relation in disk gal. from SPARC (Lelli+, 2016)
J/AJ/152/50 : Cosmicflows-3 catalog (CF3) (Tully+, 2016)
J/MNRAS/460/2143 : HI size-mass relation of galaxies (Wang+, 2016)
J/AJ/153/6 : Tully-Fisher relation for dwarf gal. (Karachentsev+, 2017)
J/ApJ/842/133 : HI-bearing ultra-diffuse ALFALFA galaxies (Leisman+, 2017)
J/ApJ/847/38 : Extreme emission line galaxies at z≲0.05 (Yang+, 2017)
J/MNRAS/474/3875 : Galaxy And Mass Assembly (GAMA): DR3 (Baldry+, 2018)
J/MNRAS/475/788 : GAMA blue spheroids within 87 Mpc (Mahajan+, 2018)
J/MNRAS/483/1754 : ALFALFA Low Surface Brightness Galaxy catalogue (Du+, 2019)
J/AJ/157/81 : The Arecibo PPS Survey. I. ALFALFA (O'Donoghue+, 2019)
J/ApJ/877/103 : Half-mass radii for galaxies at 1.0≤z≤2.5 (Suess+, 2019)
J/ApJS/248/33 : Edge-on HI-rich LSB galaxies from ALFALFA (He+, 2020)
J/ApJ/902/39 : GBT HI obs. of ultradiffuse galaxies (Karunakaran+, 2020)
J/ApJS/250/17 : NGVS. XXXIV. Ultracompact dwarf gal. in Virgo (Liu+, 2020)
J/MNRAS/493/87 : 1005 galaxies with z<0.09 sample (Trujillo+, 2020)
J/ApJS/256/4 : Catalogue of galaxies observed with Hectospec (Cheng+, 2021)
J/ApJ/915/70 : WALLABY pilot survey: HI gas in Hydra cluster (Wang+, 2021)
J/MNRAS/513/439 : GAMA DR4 spectrum catalog (Driver+, 2022)
J/A+A/657/A56 : MeerKAT Galaxy Cluster Legacy Survey DR1 (Knowles+, 2022)
J/A+A/659/A14 : HI observations of the MATLAS dwarfs (Poulain+, 2022)
J/ApJS/261/21 : HI emission line profile of ALFALFA nearby gal. (Yu+, 2022)
J/ApJ/943/177 : HETDEX Public Sources (Version 3.2) (Mentuch Cooper+, 2023)
J/ApJS/269/3 : Siena Galaxy Atlas 2020 (SGA-2020) (Moustakas+, 2023)
J/ApJS/265/57 : Early-type dwarf gal. in the local universe (Paudel+, 2023)
J/ApJ/944/94 : Cosmicflows-4 (Tully+, 2023)
J/A+A/681/A15 : Nube dark galaxy HiPERCAM urgiz images (Montes+, 2024)
J/other/SCPMA/67.19511 : The FAST all sky H I survey (FASHI) (Zhang+, 2024)
J/ApJS/279/38 : Dark galaxy cand. from ALFALFA & DESI images (Kwon+, 2025)
http://www.legacysurvey.org/dr9/ : DECaLS DR9 home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I06 --- FASHI [1206/142538] The FASHI identifier
(the ID has been substracted by 20230000000
from the FASHI cat.
(Zhang+, 2024, J/other/SCPMA/67.19511))
8- 9 I2 h RAh Optical counterpart hour of Right Ascension
(J2000)
11- 12 I2 min RAm Optical counterpart minute of Right Ascension
(J2000)
14- 17 F4.1 s RAs Optical counterpart second of Right Ascension
(J2000)
19 A1 --- DE- Optical counterpart sign of the Declination
(J2000)
20- 21 I2 deg DEd Optical counterpart degree of Declination (J2000)
23- 24 I2 arcmin DEm Optical counterpart arcminute of Declination
(J2000)
26- 29 F4.1 arcsec DEs Optical counterpart arcsecond of Declination
(J2000)
31- 34 I4 km/s cz [200/4448] Optical heliocentric velocity; =c*z
36- 42 F7.4 mag rmag [12.8/21.1] Apparent DECALS r band AB magnitude
44- 49 F6.4 mag e_rmag [0.0003/0.1] Uncertainty in rmag
51- 57 F7.4 mag gmag [13.1/21.5] Apparent DECALS g band AB magnitude
59- 64 F6.4 mag e_gmag [0.0002/0.1] Uncertainty in gmag
66- 69 F4.1 arcsec Re [1.9/29.2] Effective radius
71 A1 --- Flag HI profile flag (1)
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Note (1): HI profile as follows:
S = single-peaked profile (306 occurrences)
D = double-peaked profile (45 occurrences)
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History:
From electronic version of the journal
License: CC-BY-4.0
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 30-Jun-2026