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The HI Tully-Fisher relation of early-type galaxies

den Heijer, Milan, Oosterloo, Tom A., Serra, Paolo, Józsa, Gyula I. G., Kerp, Jürgen, Morganti, Raffaella, Cappellari, Michele, Davis, Timothy, Duc, Pierre-Alain, Emsellem, Eric, Krajnovi?, Davor, McDermid, Richard M., Naab, Torsten, Weijmans, Anne-Marie and Tim de Zeeuw, P. 2015. The HI Tully-Fisher relation of early-type galaxies. Astronomy & Astrophysics 581 , A98. 10.1051/0004-6361/201526879

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We study the H iK-band Tully-Fisher relation and the baryonic Tully-Fisher relation for a sample of 16 early-type galaxies, taken from the ATLAS3D sample, which all have very regular H i disks extending well beyond the optical body (≳ 5 Reff). We use the kinematics of these disks to estimate the circular velocity at large radii for these galaxies. We find that the Tully-Fisher relation for our early-type galaxies is offset by about 0.5-0.7 mag from the relation for spiral galaxies, in the sense that early-type galaxies are dimmer for a given circular velocity. The residuals with respect to the spiral Tully-Fisher relation correlate with estimates of the stellar mass-to-light ratio, suggesting that the offset between the relations is mainly driven by differences in stellar populations. We also observe a small offset between our Tully-Fisher relation with the relation derived for the ATLAS3D sample based on CO data representing the galaxies’ inner regions (≲1 Reff). This indicates that the circular velocities at large radii are systematically 10% lower than those near 0.5−1 Reff, in line with recent determinations of the shape of the mass profile of early-type galaxies. The baryonic Tully-Fisher relation of our sample is distinctly tighter than the standard one, in particular when using mass-to-light ratios based on dynamical models of the stellar kinematics. We find that the early-type galaxies fall on the spiral baryonic Tully-Fisher relation if one assumes M/LK = 0.54 M⊙/L⊙ for the stellar populations of the spirals, a value similar to that found by recent studies of the dynamics of spiral galaxies. Such a mass-to-light ratio for spiral galaxies would imply that their disks are 60-70% of maximal. Our analysis increases the range of galaxy morphologies for which the baryonic Tully-Fisher relations holds, strengthening previous claims that it is a more fundamental scaling relation than the classical Tully-Fisher relation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: EDP Sciences
ISSN: 0004-6361
Funders: STFC
Date of First Compliant Deposit: 20 June 2017
Date of Acceptance: 14 July 2015
Last Modified: 15 Mar 2019 14:51

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