2004/01/30 by David G. Russell · 2 citations
Chemistry · Computer Science · Physics and Astronomy · #Data Visualization and Analytics #Galaxies: Formation, Evolution, Phenomena #Spectroscopy and Laser Applications #astro-ph
paper · pdf · doi:10.1086/383298
published as Astrophys.J. 607 (2004) 241-246 · 22 pages including 4 tables and 3 figures. Accepted for publication at ApJ
arxiv created 2004/01/30 · openalex publication_date 2004/05/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
The Tully-Fisher relationship is subject to morphological type dependence such that galaxies of morphology similar to Sc I galaxies and Seyfert galaxies are more luminous at a given rotational velocity than galaxies of other morphological classification. This effect is most prevalent in the B band. It is shown that the type effect is not simply an artifact of the calibrator sample but is also present in cluster samples. The type effect is corrected by creating type-dependent Tully-Fisher relations for Sc I group galaxies and Sb/Sc III group galaxies. It is shown that with single calibrations, the distances to Sc I group galaxies are systematically underestimated, while the distances to Sb/Sc III group galaxies are systematically overestimated. Tully-Fisher slope and scatter are also considered in the context of type-dependent Tully-Fisher relations. It is concluded that the use of type-dependent Tully-Fisher relations provides significant improvement in the distances to individual galaxies and the refined distances to clusters of galaxies.