Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105...97s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 1, p. 97-120.
Astronomy and Astrophysics
Astronomy
59
Astrometry, Fabry-Perot Spectrometers, Galactic Rotation, Imaging Spectrometers, Spiral Galaxies, Astronomical Photometry, Axes Of Rotation, Charge Coupled Devices, Velocity Distribution
Scientific paper
A distance indicator for spiral galaxies is described using detailed rotation curves derived from H-alpha velocities fields and I band CCD photometry. Two-dimensional velocity fields are obtained with an imaging Fabry-Perot spectrometer, with a velocity accuracy of better than 10 km/s. Rotation curves, based upon rotating disks geometries, are fit to these velocity fields. The I band photometry profiles, and the individual rotation curves for 75 galaxies are presented. The extracted circular velocity is combined with I band magnitudes to form a Tully-Fisher relation, with a scatter of about 0.25-0.3 mag. As an example, the data are used to derive the relative distance modulus between the Hydra and Antlia clusters, which yields a peculiar motion for Antlia of 900 +/- 100 km/s. This confirms previous detections of large peculiar motions in the Hydra-Centaurus region.
Bothun Gragory D.
Mould Jeremy R.
Schommer Robert A.
Williams Ted B.
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