J/ApJS/276/59 The DiskMass Survey (DMS). XI. Full Ha sample (Swaters+, 2025)
The DiskMass Survey.
XI. Disk geometries and star formation surface densities from ionized gas
kinematics and line intensities for the full Ha sample.
Swaters R.A., Andersen D.R., Bershady M.A., Martinsson T.P.K., Scholz P.,
Verheijen M.A.W., Westfall K.B.
<Astrophys. J. Suppl. Ser., 276, 59 (2025)>
=2025ApJS..276...59S 2025ApJS..276...59S
ADC_Keywords: Galaxy catalogs; Spectra, optical; Photometry, infrared;
Magnitudes, absolute; Extinction; Velocity dispersion;
Equivalent widths
Keywords: Galaxy dynamics ; Galaxy kinematics ; Unbarred spiral galaxies ;
Galaxy structure
Abstract:
We present Hα-region integral-field spectroscopy for
137 low-inclination, intermediate to late-type galaxies. Spectroscopic
data, obtained with SparsePak and the Bench Spectrograph on the WIYN
3.5m telescope, span 6475-6880 Å with an instrumental resolution of
13km/s (σ). The spectral range includes Hα and
[NII]λλ6548,6584 for every source, and in most cases
includes [SII]λλ6717,6731. We present and publicly
release 18288 calibrated spectra and visually inspected Gaussian line
fits to the Hα emission. Most measurements yield a
signal-to-noise ratio above 5 in integrated Hα line flux,
adequate to derive reliable line centroids and widths. Second
kinematic components are required to adequately describe the
emission-line profile in 15% of reliable data. The Hα velocity
dispersion distribution peaks at 18km/s, modestly increasing with
Hα surface brightness, reaching 20km/s at
ΣHα=1040erg/s/kpc2. Lower-flux secondary components,
when present, have widths of ∼50km/s. These results agree well with
previous echelle measurements of nearby galaxies. Velocity-field
analysis yields kinematic inclinations, with a sample mean of 26°.
Large kinematic asymmetries systematically affect kinematic
inclination estimates in a small fraction of our sample. When
deviations from circular motion are below 10% of the projected
velocity, kinematic inclinations are consistent, within errors, to
estimates from inverting the Tully-Fisher relation. This confirms
previous disk-submaximality estimates for galaxies with regular
kinematics based on inclinations derived from inverting the
Tully-Fisher relation.
Description:
As described in the DiskMass Survey (DMS) Paper I
(Bershady+ 2010, J/ApJ/716/198), we produced an initial sample of
231 galaxies from the UGC.
From the Phase-A sample, we obtained Ha observations of 146 galaxies.
Nine of the galaxies that met these conditions were already observed
using DensePak: UGC 1322, UGC 3091, UGC 4380, UGC 4978, UGC 5730,
UGC6135, UGC 7072, UGC 7208, and UGC 12784. The observations and
reductions for these galaxies are described in
Andersen+ (2006, J/ApJS/166/505) and are not reported here.
Hα observations for the balance of 137 galaxies were carried out
at the 3.5m WIYN telescope, between 2001 and 2005, using the SparsePak
integral field unit. SparsePak feeds the WIYN Bench Spectrograph, a
fiber-fed spectrograph designed to provide low to medium-resolution
spectroscopy. We used the Bench Spectrograph Camera (BSC) and a
316line/mm echelle grating in order 8 to cover 6475Å<λ<6880Å.
Of the 137 galaxies observed with SparsePak as part of the DMS,
125 had sufficient signal to attempt velocity-field modeling.
As discussed by DMS I, the DiskMass Survey obtained new broadband
imaging data for nearly all galaxies in the Ha sample using the KPNO
2.1m telescope. Optical data in UBVRI were obtained during four
observing runs (2003-Sept-25, 7 nights; 2004-Feb-13, 7 nights;
2006-Feb-24, 4 nights; 2007-Apr-16, 8 nights).
See Section 2.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 88 125 Hα velocity field parameters
table4.dat 59 125 Photometric data and inverse Tully-Fisher inclinations
table7.dat 123 18288 Hα data table for individual fiber
measurements
--------------------------------------------------------------------------------
See also:
II/183 : UBVRI Photometric Standards (Landolt 1992)
VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)
J/AJ/114/2402 : Rotation curves of early-type galaxies (Courteau+, 1997)
J/ApJ/533/744 : Calibration of the Tully-Fischer relation (Tully+, 2000)
J/A+A/370/765 : HI synthesis observations in UMa cluster (Verheijen+, 2001)
J/A+A/390/863 : CCD R Photometry of WHISP Dwarf Galaxies (Swaters, 2002)
J/ApJS/166/505 : Hα photometry of face-on galaxies (Andersen+, 2006)
J/MNRAS/390/466 : GHASP: Hα data cubes for 97 galaxies (Epinat+, 2008)
J/ApJ/716/198 : The DiskMass survey. I. (Bershady+, 2010)
J/MNRAS/401/2113 : GHASP: Hα data cubes for 153 galaxies (Epinat+, 2010)
J/MNRAS/465/123 : SAMI Galaxy Survey asymmetries (Bloom+, 2017)
J/MNRAS/495/2265 : Veloc. dispersions in star-forming galaxies (Varidel+, 2020)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- UGC [16/12808] UGC galaxy identifier
7- 9 I3 --- N [25/393] Number
11- 14 F4.1 km/s sigMod [0/16.1] Extra error term, σmod
(see Equation 6)
16- 19 F4.1 deg inc [14.5/47.5]? Inclination
21- 24 F4.1 deg e_inc [0.8/15]? inc uncertainty
26 A1 --- f_inc Flag on inc (1)
28- 32 F5.1 deg phi0 [8/374.1] Position angle of the major axis,
φ0
34- 36 F3.1 deg e_phi0 [0.2/8] phi0 uncertainty
38- 42 F5.1 km/s Vrot [6.6/211] Asymptotic rotation speed, Vrot
44- 47 F4.1 km/s e_Vrot [0.4/12.2] Vrot uncertainty
49- 52 F4.1 arcsec hrot [0.1/38]? Rotation scale, hrot
54- 56 F3.1 arcsec e_hrot [0/5.1]? hrot uncertainty
58- 60 A3 --- f_hrot Flag on hrot (2)
62- 68 F7.1 km/s Vsys [224.8/12794] Systemic velocity
70- 72 F3.1 km/s e_Vsys [0.3/4] Vsys uncertainty
74- 78 F5.3 --- Aphi [0.015/0.4] Asymetry measure, Aφ,
defined in Section 5.3
80- 84 F5.3 --- Arc [0.016/0.8]? Asymmetry measure, ARC, defined
in Section 5.3
86- 88 A3 --- Note Note (s) (3)
--------------------------------------------------------------------------------
Note (1): Flag as follows:
l = "low" kinematic inclination; see Section 5
Note (2): Note as follows:
URC = For UGC 4458, we used the Courteau S. (1997AJ....114.2402C 1997AJ....114.2402C) empirical
URC model to fit the rotation curve and derive a kinematic fit to
the velocity field.
Note (3): Note as follows:
1 = Two-armed spiral galaxy with no visual evidence of kinematic
perturbations associated with arms.
2 = Two-armed spiral galaxy with clear visual evidence of kinematic
perturbations associated with arms.
3 = Galaxy with evidence of minor interaction that perturbs the velocity
field.
4 = Galaxy with a misalignment between major and minor axes, which is
evidence for a warp or strong spiral arm perturbations.
5 = Patchy kinematic data makes visual inspection difficult.
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- UGC [16/12808] UGC galaxy identifier
7- 11 F5.2 mag Kmag [8.62/11.93] 2MASS K band magnitude (4)
13- 16 F4.2 mag e_Kmag [0.01/0.23] Uncertainty on the Kmag
18- 22 F5.1 Mpc Dist [1.8/181.4] Distance (5)
24- 26 F3.1 Mpc e_Dist [2.5/2.5] Dist uncertainty
28- 32 F5.2 mag Ak [-0.03/0.06] K-band extinction
34- 38 F5.2 mag Kcor [-0.1/0.01] K-correction
40- 45 F6.2 mag KMag [-26.07/-16.09] Absolute K band magnitude
47- 50 F4.2 mag e_KMag [0.02/1.95] KMag uncertainty
52- 55 F4.1 deg iiTF [1.8/90] Inverse Tully-Fisher inclination, iiTF
57- 59 F3.1 deg e_iiTF [0/4.3] iiTF uncertainty
--------------------------------------------------------------------------------
Note (4): As in DMS V (Bershady+ 2011ApJ...739L..47B 2011ApJ...739L..47B), we measured total
K-band magnitudes from Two Micron All Sky Survey images that we
reprocessed to remove sky-background gradients as described in DMS VI
(Martinsson+ 2013A&A...557A.130M 2013A&A...557A.130M).
We also took advantage of J-, H-, and K-band images and used our own
elliptical multiaperture photometry to estimate total magnitudes via
an extrapolation method.
See Section 6.1.2.
Note (5): To arrive at absolute K-band magnitudes for our samples, distances
were generated by the Cosmicflows-3 Distance-Velocity Calculator
(Kourkchi+ 2020AJ....159...67K 2020AJ....159...67K) using the heliocentric velocities
derived from our velocity field model fits and adopting
H0=73km/s/Mpc consistent with the value used throughout this paper
series. See Section 6.1.3.
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Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- UGC [16/12808] UGC galaxy identifier
7- 9 A3 --- R Run code (1)
11 I1 --- N [1/5] Night during the observing run
13 I1 --- P [1/4] SparsePak pointing
15- 16 I2 --- A [1/82] SparsePak fiber aperture
18 I1 --- C [1/9] Fitting code (2)
20- 24 F5.1 arcsec oRA [-70.5/38.7] East-West offset of
fiber aperture (3)
26- 30 F5.1 arcsec oDE [-47/62.5] North-South offset of
fiber aperture (3)
32- 37 F6.1 10-10m EWg [-0.2/1167]? Hα emission
equivalent width from sum of Gaussian
line parameters
39- 45 F7.1 10-10m EWsum [-0.2/29060]? Hα emission
equivalent width from zeroth moment
of line emission
47- 52 F6.2 [mW/m2/arcsec2] logmuN [-16.6/-13] Log Hα narrow
component surface-brightness
(flux within the 4.7" diameter fiber
aperture); in erg/s/cm2/arcsec2
54- 58 F5.2 [mW/m2/arcsec2] e_logmuN [0/73] Uncertainty in logmuN
60- 65 F6.1 km/s VelN [-382/348] Narrow component velocity
relative to kinematic model galaxy
barycenter
67- 72 F6.1 km/s e_VelN [0/5579] Uncertainty in VelN
74- 78 F5.1 km/s sigmaN [2.9/142] Narrow component velocity
dispersion
80- 84 F5.1 km/s e_sigmaN [0/999] Uncertainty in sigmaN
86- 91 F6.2 [mW/m2/arcsec2] logmuB [-99/-13]? Log Hα broad
component surface-brightness;
in erg/s/cm2/arcsec2
93- 97 F5.2 [mW/m2/arcsec2] e_logmuB [0/13.4]? Uncertainty in logmuB
99- 104 F6.1 km/s VelB [-487/340]? Broad component velocity
relative to the kinematic model
galaxy barycenter
106- 111 F6.1 km/s e_VelB [0/1174]? Uncertainty in VelB
113- 117 F5.1 km/s sigmaB [0/888]? Broad component velocity
dispersion
119- 123 F5.1 km/s e_sigmaB [0/999]? Uncertainty in sigmaB
--------------------------------------------------------------------------------
Note (1): SparsePak Run Log, in Table 1, as follows:
-------------------------------
RunID UT start date Nights
-------------------------------
P1 2001-05-06 2
P2 2002-01-02 3.5
P3 2002-03-24 3
R1 2002-10-20 5
R2 2002-12-08 2
R3 2003-01-08 1.5
R4 2003-03-14 2
R5 2003-04-16 5
R6 2003-05-18 3.5
R7 2003-10-02 3
R8 2004-03-28 3
R9 2004-09-24 5
R10 2005-03-27 2
R11 2005-04-22 3
-------------------------------
Note (2): Statistics of Halpha line fits, in Table 2, as follows:
-----------------------------------------------
Description Code % of fits
-----------------------------------------------
Single 1 43.3
Double, symmetric wings 2 1.4
Double, offset wings 3 6.9
Double, distinct components 4 0.7
Questionable single fit 7 4.3
Questionable double fit 9 0.5
No Line Fit 0 31.6
Bad Fit -1 11.3
-----------------------------------------------
Note (3): From the kinematic model galaxy barycenter.
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History:
From electronic version of the journal
References:
Bershady et al. Paper I. 2010ApJ...716..198B 2010ApJ...716..198B Cat. J/ApJ/716/198
Bershady et al. Paper II. 2010ApJ...716..234B 2010ApJ...716..234B
Westfall et al. Paper III. 2011ApJS..193...21W 2011ApJS..193...21W
Westfall et al. Paper IV. 2011ApJ...742...18W 2011ApJ...742...18W
Bershady et al. Paper V. 2011ApJ...739L..47B 2011ApJ...739L..47B
Martinsson et al. Paper VI. 2013A&A...557A.130M 2013A&A...557A.130M
Martinsson et al. Paper VII. 2013A&A...557A.131M 2013A&A...557A.131M
Westfall et al. Paper VIII. 2014ApJ...785...43W 2014ApJ...785...43W
Swaters et al. Paper IX. 2014ApJ...797L..28S 2014ApJ...797L..28S
Martinsson et al. Paper X. 2016A&A...585A..99M 2016A&A...585A..99M
Swaters et al. Paper XI. 2025ApJS..276...59S 2025ApJS..276...59S This catalog
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 31-Oct-2025