The DiskMass Survey. XI. Disk Geometries and Star Formation Surface Densities from Ionized Gas Kinematics and Line Intensities for the Full Hα Sample
We present H α -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 rang...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4365/ad9ddf |
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| author | Robert A. Swaters David R. Andersen Matthew A. Bershady Thomas P. K. Martinsson Paul Scholz Marc A.W. Verheijen Kyle B. Westfall |
| author_facet | Robert A. Swaters David R. Andersen Matthew A. Bershady Thomas P. K. Martinsson Paul Scholz Marc A.W. Verheijen Kyle B. Westfall |
| author_sort | Robert A. Swaters |
| collection | DOAJ |
| description | We present H α -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 H α and [N ii ] λλ 6548, 6584 for every source, and in most cases includes [S ii ] λλ 6717, 6731. We present and publicly release 18,288 calibrated spectra and visually inspected Gaussian line fits to the H α emission. Most measurements yield a signal-to-noise ratio above 5 in integrated H α 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 H α velocity dispersion distribution peaks at 18 km s ^−1 , modestly increasing with H α surface brightness, reaching 20 km s ^−1 at Σ _H _α = 10 ^40 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. |
| format | Article |
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| institution | OA Journals |
| issn | 0067-0049 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal Supplement Series |
| spelling | doaj-art-2fd3d6ae0d9647059596770cb4c59c1d2025-08-20T01:51:42ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0127625910.3847/1538-4365/ad9ddfThe DiskMass Survey. XI. Disk Geometries and Star Formation Surface Densities from Ionized Gas Kinematics and Line Intensities for the Full Hα SampleRobert A. Swaters0David R. Andersen1https://orcid.org/0009-0006-8064-8481Matthew A. Bershady2https://orcid.org/0000-0002-3131-4374Thomas P. K. Martinsson3Paul Scholz4https://orcid.org/0000-0002-7374-7119Marc A.W. Verheijen5Kyle B. Westfall6https://orcid.org/0000-0003-1809-6920Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; Department of Astronomy, University of Maryland , College Park, MD 20742, USATMT International Observatory , 100 W. Walnut Street, Suite 300, Pasadena, CA 91124, USA; NRC - Herzberg Astronomy & Astrophysics , 5071 W. Saanich Road, Victoria, BC V8X2G6, CanadaUniversity of Wisconsin–Madison , Department of Astronomy, 475 N. Charter Street, Madison, WI 53706-1582, USAKapteyn Astronomical Institute, University of Groningen , Landleven 12, NL-9747 AD Groningen, The NetherlandsDepartment of Physics and Astronomy, York University , 4700 Keele Street, Toronto, ON M3J1P3, CanadaKapteyn Astronomical Institute, University of Groningen , Landleven 12, NL-9747 AD Groningen, The NetherlandsUniversity of California Observatories, University of California , Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USAWe present H α -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 H α and [N ii ] λλ 6548, 6584 for every source, and in most cases includes [S ii ] λλ 6717, 6731. We present and publicly release 18,288 calibrated spectra and visually inspected Gaussian line fits to the H α emission. Most measurements yield a signal-to-noise ratio above 5 in integrated H α 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 H α velocity dispersion distribution peaks at 18 km s ^−1 , modestly increasing with H α surface brightness, reaching 20 km s ^−1 at Σ _H _α = 10 ^40 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.https://doi.org/10.3847/1538-4365/ad9ddfGalaxy dynamicsGalaxy kinematicsUnbarred spiral galaxiesGalaxy structure |
| spellingShingle | Robert A. Swaters David R. Andersen Matthew A. Bershady Thomas P. K. Martinsson Paul Scholz Marc A.W. Verheijen Kyle B. Westfall The DiskMass Survey. XI. Disk Geometries and Star Formation Surface Densities from Ionized Gas Kinematics and Line Intensities for the Full Hα Sample The Astrophysical Journal Supplement Series Galaxy dynamics Galaxy kinematics Unbarred spiral galaxies Galaxy structure |
| title | The DiskMass Survey. XI. Disk Geometries and Star Formation Surface Densities from Ionized Gas Kinematics and Line Intensities for the Full Hα Sample |
| title_full | The DiskMass Survey. XI. Disk Geometries and Star Formation Surface Densities from Ionized Gas Kinematics and Line Intensities for the Full Hα Sample |
| title_fullStr | The DiskMass Survey. XI. Disk Geometries and Star Formation Surface Densities from Ionized Gas Kinematics and Line Intensities for the Full Hα Sample |
| title_full_unstemmed | The DiskMass Survey. XI. Disk Geometries and Star Formation Surface Densities from Ionized Gas Kinematics and Line Intensities for the Full Hα Sample |
| title_short | The DiskMass Survey. XI. Disk Geometries and Star Formation Surface Densities from Ionized Gas Kinematics and Line Intensities for the Full Hα Sample |
| title_sort | diskmass survey xi disk geometries and star formation surface densities from ionized gas kinematics and line intensities for the full hα sample |
| topic | Galaxy dynamics Galaxy kinematics Unbarred spiral galaxies Galaxy structure |
| url | https://doi.org/10.3847/1538-4365/ad9ddf |
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