A&A 618, A126 (2018) Astronomy https://doi.org/10.1051/0004-6361/201833580 & c ESO 2018 Astrophysics Cold gas in a complete sample of group-dominant early-type galaxies?;?? E. O’Sullivan1, F. Combes2,3, P. Salomé2, L. P. David1, A. Babul4, J. M. Vrtilek1, J. Lim5,6, V. Olivares2, S. Raychaudhury7,8, and G. Schellenberger1 1 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA e-mail:
[email protected] 2 LERMA, Observatoire de Paris, CNRS, PSL Univ., Sorbonne Univ., 75014 Paris, France 3 Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France 4 Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 2Y2, Canada 5 Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong 6 Laboratory for Space Research, Faculty of Science, The University of Hong Kong, Pokfulam Road, Hong Kong 7 Inter-University Centre for Astronomy and Astrophysics, Pune 411007, India 8 Department of Physics, Presidency University, 86/1 College Street, 700073 Kolkata, India Received 5 June 2018 / Accepted 23 July 2018 ABSTRACT We present IRAM 30 m and APEX telescope observations of CO(1-0) and CO(2-1) lines in 36 group-dominant early-type galaxies, completing our molecular gas survey of dominant galaxies in the Complete Local-volume Groups Sample. We detect CO emission 8 in 12 of the galaxies at >4σ significance, with molecular gas masses in the range ∼0:01−6 × 10 M , as well as CO in absorption in the non-dominant group member galaxy NGC 5354. In total 21 of the 53 CLoGS dominant galaxies are detected in CO and we −1 confirm our previous findings that they have low star formation rates (0.01–1 M yr ) but short depletion times (<1 Gyr) implying rapid replenishment of their gas reservoirs.