Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-15
Astrophys.J.659:1172-1175,2007
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, accepted for publication in Astrophysical Journal
Scientific paper
10.1086/512717
We study the locus of dwarf and giant early and late-type galaxies on the Tully-Fisher relation (TFR), the stellar mass Tully-Fisher relation (sTFR) and the so-called baryonic or HI gas+stellar mass Tully-Fisher relation (gsTFR). We show that early-type and late-type galaxies, from dwarfs to giants, trace different yet approximately parallel TFRs. Surprisingly, early-type and late-type galaxies trace a single yet curved sTFR over a range of 3.5 orders of magnitude in stellar mass. Moreover, all galaxies trace a single, linear gsTFR, over 3.5 orders of magnitude in HI gas+stellar mass. Dwarf ellipticals, however, lie slightly below the gsTFR. This may indicate that early-type dwarfs, contrary to the late-types, have lost their gas, e.g. by galactic winds or ram-pressure stripping. Overall, environment only plays a secondary role in shaping these relations, making them a rather ``clean'' cosmological tool. LCDM simulations predict roughly the correct slopes for these relations.
de Rijcke Sven
Dejonghe Herwig
Hau George K. T.
Prugniel Philippe
Zeilinger Werner W.
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