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- W2005773259 abstract "We present I-band photometry, long-slit optical spectroscopy, and new aperture synthesis H I observations for eight late-type spiral galaxies with rotation velocities in the range 243 km s-1 ≲ Vrot ≲ 308 km s-1. 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/H I rotation curves for each. Despite the presence of H I warps and low-mass companions in many systems, their kinematics are regular and there is excellent agreement between optical and H I tracers near the optical radius ropt. At high inclinations at which projection effects are negligible, the sample galaxies exhibit flat, featureless rotation curves out to their last measured points at 1.7ropt-3.5ropt. The intermediate-inclination systems are also consistent with a constant rotation amplitude for r ≳ 0.5ropt. 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 spiral galaxies with reliable outer H I kinematics from the work of Casertano and van Gorkom, we find no convincing trends between logarithmic outer rotation curve slopes and rotation amplitudes or surface brightnesses for galaxies with Vrot ≳ 220 km s-1. Correlations between these slopes and morphological types or disk scale lengths are also marginal in this regime." @default.
- W2005773259 created "2016-06-24" @default.
- W2005773259 creator A5027207716 @default.
- W2005773259 creator A5050003613 @default.
- W2005773259 date "2006-08-15" @default.
- W2005773259 modified "2023-09-26" @default.
- W2005773259 title "The Structure of Rapidly Rotating Late-Type Spiral Galaxies. I. Photometry, H<scp>i</scp>, and Optical Kinematics" @default.
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