TY - JOUR
T1 - The ATLAS(3D) project - V. The CO Tully-Fisher relation of early-type galaxies
AU - Davis, Timothy A.
AU - Bureau, Martin
AU - Young, Lisa M.
AU - Alatalo, Katherine
AU - Blitz, Leo
AU - Cappellari, Michele
AU - Scott, Nicholas
AU - Bois, Maxime
AU - Bournaud, Frederic
AU - Davies, Roger L.
AU - de Zeeuw, P. Tim
AU - Emsellem, Eric
AU - Khochfar, Sadegh
AU - Krajnovic, Davor
AU - Kuntschner, Harald
AU - Lablanche, Pierre-Yves
AU - McDermid, Richard M.
AU - Morganti, Raffaella
AU - Naab, Thorsten
AU - Oosterloo, Tom
AU - Sarzi, Marc
AU - Serra, Paolo
AU - Weijmans, Anne-Marie
N1 - The definitive version can be found at : http://onlinelibrary.wiley.com/ Copyright Royal Astronomical Society
PY - 2011/6
Y1 - 2011/6
N2 - 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.
AB - 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.
KW - ISM: kinematics and dynamics
KW - galaxies: elliptical and lenticular, cD
KW - galaxies: evolution
KW - galaxies: kinematics and dynamics
KW - galaxies: spiral
KW - galaxies: structure
U2 - 10.1111/j.1365-2966.2011.18284.x
DO - 10.1111/j.1365-2966.2011.18284.x
M3 - Article
SN - 0035-8711
VL - 414
SP - 968
EP - 984
JO - Monthly Notices of the Royal Astronomical Society (MNRAS)
JF - Monthly Notices of the Royal Astronomical Society (MNRAS)
IS - 2
ER -