Rotational Widths for Use in the Tully-Fisher Relation. II. The Impact of Surface Brightness

Abstract

Using a large sample of spiral galaxies for which 21 cm single-dish and/or long-slit optical spectra are available, we make a detailed comparison between various estimates of rotational widths. Different optical width estimators are considered and their limitations discussed, with emphasis on biases associated with rotation curve properties (shape and extent) and disk central surface brightness. The best match with HI rotational velocities is obtained with Polyex widths, which are measured at the optical radius (encompassing a fixed fraction of the total light of the galaxy) from a model fit to the rotation curve. In contrast with Polyex widths, optical rotational velocities measured at 2.15 disk scale lengths r_d deviate from HI widths by an amount that correlates with the central surface brightness of the disk. This bias occurs because the rotation curves of galaxies are in general still rising at 2.15 r_d, and the fraction of total mass contained within this radius decreases with increasing disk surface brightness. Statistical corrections, parameterized by the radial extent of the observed rotation curve, are provided to reduce Polyex and HI width measurements into a homogeneous system. This yields a single robust estimate of rotational velocity to be used for applications of disk scaling relations.

arXiv comment13 pages, 8 figures. To appear in the Astronomical Journal (August 2007)

References in corpus (16)

• H alpha rotation curves of Low Surface Brightness galaxies
• A Digital Archive of HI 21 cm Line Spectra of Optically-targeted Galaxies
• The Ursa Major Cluster of Galaxies. V ; HI Rotation Curve Shapes and the Tully-Fisher Relations
• Optical Rotation Curves and Linewidths for Tully-Fisher Applications
• The HI Content of Spirals. II. Gas Deficiency in Cluster Galaxies
• The Cores of Dark Matter Dominated Galaxies: theory vs. observations
• Testing the Dark Matter Hypothesis with Low Surface Brightness Galaxies and Other Evidence
• The I-Band Tully-Fisher Relation for Cluster Galaxies: Data Presentation
• The I-Band Tully-Fisher Relation for Cluster Galaxies: a Template Relation, its Scatter and Bias Corrections
• SFI++ I: A New I-band Tully-Fisher Template, the Cluster Peculiar Velocity Dispersion and H0
• Template Rotation Curves for Disk Galaxies
• Arecibo HI Mapping of a Large Sample of Dwarf Irregular Galaxies
• Rotational Widths for Use in the Tully-Fisher Relation. I. Long-slit Spectroscopic Data
• Seeking the Local Convergence Depth. I. TF Observations of the Clusters A168, A397, A569, A1139, A1228, and A1983
• M/L, H-alpha Rotation Curves, and HI Measurements for 329 Nearby Cluster and Field Spirals: I. Data
• Tests of the Tully-Fisher Relation II: Scatter Using Optical Rotation Curves

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