The Structure of Rapidly Rotating Late-Type Spiral Galaxies: I. Photometry, HI and Optical Kinematics
| dc.creator | Spekkens, K. | |
| dc.creator | Giovanelli, R. | |
| dc.date | 2006-05-22 | |
| dc.date | 2006-07-25 | |
| dc.date.accessioned | 2026-07-07T11:25:37Z | |
| dc.date.available | 2026-07-07T11:25:37Z | |
| dc.description | We present I-band photometry, long-slit optical spectroscopy, and new aperture synthesis HI observations for eight late-type spirals with rotation velocities in the range 243 km/s < V_{rot} < 308 km/s. The sample will be used to study the structure and angular momentum of disks at the high-mass end of the spiral galaxy population; here we discuss the basic properties of these ``fast rotators'', and derive hybrid optical/HI rotation curves for each. Despite the presence of HI warps and low-mass companions in many systems, their kinematics are regular and there is excellent agreement between optical and HI tracers near the optical radius r_{opt}. At high inclinations at which projection effects are negligible, the sample galaxies exhibit flat, featureless rotation curves out to their last measured points at 1.7r_{opt}--3.5 r_{opt}. The intermediate inclination systems are also consistent with a constant rotation amplitude for r > 0.5 r_{opt}. We therefore find no evidence for declining rotation curves at the high-mass end of the late-type spiral galaxy population. Combining our data with the compilation of spirals with reliable outer HI kinematics from the work of Casertano & van Gorkom, we find no convincing trends between logarithmic outer rotation curve slopes and rotation amplitudes or surface brightnesses for galaxies with V_{rot} > 220 km/s. Correlations between these slopes and morphological types or disk scale lengths are also marginal in this regime. | |
| dc.description | v2: minor changes to match proofs. 23 pages, 15 figures, AJ in press. For version with high resolution figures, see http://www.physics.rutgers.edu/~spekkens/papers/fast1.pdf | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0605542 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0605542 | |
| dc.identifier | Astron.J.132:1426-1444,2006 | |
| dc.identifier | doi:10.1086/506177 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/195561 | |
| dc.subject | Astrophysics | |
| dc.title | The Structure of Rapidly Rotating Late-Type Spiral Galaxies: I. Photometry, HI and Optical Kinematics | |
| dc.type | text |