Cold gas in a complete sample of group-dominant early-type galaxies

We present IRAM 30m 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 in 12 of the galaxies at >4sigma significance, with...

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Veröffentlicht in:	arXiv.org 2018-09
Hauptverfasser:	O'Sullivan, E, Combes, F, Salomé, P, David, L P, Babul, A, Vrtilek, J M, Lim, J, Olivares, V, Raychaudhury, S, Schellenberger, G
Format:	Artikel
Sprache:	eng
Schlagworte:	Active galactic nuclei Cold gas Cooling flows (astrophysics) Depletion Galactic clusters Galaxies Luminosity Molecular gases Physics - Astrophysics of Galaxies Radio astronomy Replenishment Star & galaxy formation Star formation Stars & galaxies Virgo galactic cluster
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Zusammenfassung:	We present IRAM 30m 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 in 12 of the galaxies at >4sigma significance, with molecular gas masses in the range 0.01-6x10^8 Msol, 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 confirm our previous findings that they have low star formation rates (0.01-1 Msol/yr) but short depletion times (
ISSN:	2331-8422
DOI:	10.48550/arxiv.1807.09110