The ATLAS(3D) project - V. The CO Tully-Fisher relation of early-type galaxies
We demonstrate here using both single-dish and interferometric observations that CO molecules are an excellent kinematic tracer, even in high-mass galaxies, allowing us to investigate for the first time the CO Tully-Fisher relation (CO-TFR) of early-type galaxies. We compare the TFRs produced using both single-dish and interferometric data and various inclination estimation methods, and evaluate the use of the velocity profile shape as a criterion for selecting galaxies in which the molecular gas extends beyond the peak of the rotation curve. We show that the gradient and zero-point of the best-fitting relations are robust, independent of the velocity measure and inclination used, and agree with those of relations derived using stellar kinematics. We also show that the early-type CO-TFR is offset from the CO-TFR of spirals by 0.98 +/- 0.22 mag at K-s band, in line with other results. The intrinsic scatter of the relation is found to be approximate to 0.4 mag, similar to the level found in the spiral galaxy population. Next-generation facilities such as the Large Millimeter Telescope and the Atacama Large Millimeter/Sub-millimeter Array should allow this technique to be used in higher redshift systems, providing a simple new tool to trace the mass-to-light ratio evolution of the most massive galaxies over cosmic time.
Item Type | Article |
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Uncontrolled Keywords | ISM: kinematics and dynamics; galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: kinematics and dynamics; galaxies: spiral; galaxies: structure |
Date Deposited | 26 Jul 2024 11:27 |
Last Modified | 26 Jul 2024 11:27 |
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- Davis, Timothy A.
- Bureau, Martin
- Young, Lisa M.
- Alatalo, Katherine
- Blitz, Leo
- Cappellari, Michele
- Scott, Nicholas
- Bois, Maxime
- Bournaud, Frederic
- Davies, Roger L.
- de Zeeuw, P. Tim
- Emsellem, Eric
- Khochfar, Sadegh
- Krajnovic, Davor
- Kuntschner, Harald
- Lablanche, Pierre-Yves
- McDermid, Richard M.
- Morganti, Raffaella
- Naab, Thorsten
- Oosterloo, Tom
- Sarzi, Marc
- Serra, Paolo
- Weijmans, Anne-Marie
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