2025ApJS..276...59S -
Astrophys. J., Suppl. Ser., 276, 59 (2025/February-0)
The DiskMass Survey. XI. Disk Geometries and Star Formation Surface Densities from Ionized Gas Kinematics and Line Intensities for the Full Hα Sample.
SWATERS R.A., ANDERSEN D.R., BERSHADY M.A., MARTINSSON T.P.K., SCHOLZ P., VERHEIJEN M.A.W. and WESTFALL K.B.
Abstract (from CDS):
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 3.5 m telescope, span 6475-6880 Å with an instrumental resolution of 13 km s–1 (σ). The spectral range includes Hα and [N II]λλ6548, 6584 for every source, and in most cases includes [S II]λλ6717, 6731. We present and publicly release 18,288 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 18 km s–1, modestly increasing with Hα surface brightness, reaching 20 km s–1 at ΣHα = 1040 erg s–1 kpc–2. Lower-flux secondary components, when present, have widths of ∼50 km s–1. 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.
Abstract Copyright:
© 2025. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
Galaxy dynamics - Galaxy kinematics - Unbarred spiral galaxies - Galaxy structure
Status at CDS
:
Large table(s) of objects being ingested in VizieR.
Simbad objects:
148
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2025ApJS..276...59S and select 'bookmark this link' or equivalent in the popup menu