Rotational Widths for Use in the Tully-Fisher Relation. I. Long-slit Spectroscopic Data

Abstract

We present new long-slit Halpha spectroscopy for 403 non-interacting spiral galaxies, obtained at the Palomar Observatory 5 m Hale telescope, which is used to derive well-sampled optical rotation curves. Because many of the galaxies show optical emission features which are significantly extended along the spectrograph slit, a technique was devised to separate and subtract the night sky lines from the galaxy emission. We exploit a functional fit to the rotation curve to identify its center of symmetry; this method minimizes the asymmetry in the final, folded rotation curve. We derive rotational widths using both velocity histograms and the Polyex model fit. The final rotational width is measured at a radius containing 83% of the total light as derived from I-band images. In addition to presenting the new data, we use a large sample of 742 galaxies for which both optical long-slit and radio HI line spectroscopy are available to investigate the relation between the HI content of the disks and the extent of their rotation curves. Our results show that the correlation between those quantities, which is well-established in the case of HI-poor galaxies in clusters, is present also in HI-normal objects: for a given optical size, star formation can be traced further out in the disks of galaxies with larger HI mass.

arXiv comment16 pages, 6 figures. Full version of Table 1 and Figure 5 available as separate files. To appear in AJ (September 2005)

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