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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Additional information | The definitive version can be found at : http://onlinelibrary.wiley.com/ Copyright Royal Astronomical Society |
Keywords | ism: kinematics and dynamics, galaxies: elliptical and lenticular, cd, galaxies: evolution, galaxies: kinematics and dynamics, galaxies: spiral, galaxies: structure |
Date Deposited | 15 May 2025 12:13 |
Last Modified | 04 Jun 2025 16:59 |
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picture_as_pdf - 905565.pdf
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subject - Submitted Version