Cold gas in group-dominant elliptical galaxies

E. O'Sullivan; F. Combes; S. Hamer; Philippe Salomé; A. Babul; S. Raychaudhury

doi:10.1051/0004-6361/201424835

Cold gas in group-dominant elliptical galaxies

E. O'Sullivan, F. Combes, S. Hamer, Philippe Salomé, A. Babul, S. Raychaudhury

Department of Physics

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Abstract

We present IRAM 30m telescope observations of the CO(1-0) and (2-1) lines in a sample of 11 group-dominant elliptical galaxies selected from the CLoGS nearby groups sample. Our observations confirm the presence of molecular gas in 4 of the 11 galaxies at >4 sigma significance, and combining these with data from the literature we find a detection rate of 43+-14%, comparable to the detection rate for nearby radio galaxies, suggesting that group-dominant ellipticals may be more likely to contain molecular gas than their non-central counterparts. Those group-dominant galaxies which are detected typically contain ~2x10^8 Msol of molecular gas, and although most have low star formation rates (

Original language	English
Article number	A111
Number of pages	9
Journal	Astronomy & Astrophysics
Volume	573
Early online date	7 Jan 2015
DOIs	https://doi.org/10.1051/0004-6361/201424835
Publication status	Published - Jan 2015

Keywords

astro-ph.GA

Access to Document

10.1051/0004-6361/201424835

1408.7106v2
(C) ESO, 2015. This is the author accepted manuscript of a paper published in final form at: https://doi.org/10.1051/0004-6361/201424835
Accepted author manuscript, 242 KB

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title = "Cold gas in group-dominant elliptical galaxies",

abstract = " We present IRAM 30m telescope observations of the CO(1-0) and (2-1) lines in a sample of 11 group-dominant elliptical galaxies selected from the CLoGS nearby groups sample. Our observations confirm the presence of molecular gas in 4 of the 11 galaxies at >4 sigma significance, and combining these with data from the literature we find a detection rate of 43+-14%, comparable to the detection rate for nearby radio galaxies, suggesting that group-dominant ellipticals may be more likely to contain molecular gas than their non-central counterparts. Those group-dominant galaxies which are detected typically contain ~2x10^8 Msol of molecular gas, and although most have low star formation rates (",

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T1 - Cold gas in group-dominant elliptical galaxies

AU - O'Sullivan, E.

AU - Combes, F.

AU - Hamer, S.

AU - Salomé, Philippe

AU - Babul, A.

AU - Raychaudhury, S.

N1 - 9 pages, 5 postscript figures, 4 tables, accepted by A&A. Revised throughout in response to referee's comments, including updates to Table 1 and Figure 4, and addition of Figure 5

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AB - We present IRAM 30m telescope observations of the CO(1-0) and (2-1) lines in a sample of 11 group-dominant elliptical galaxies selected from the CLoGS nearby groups sample. Our observations confirm the presence of molecular gas in 4 of the 11 galaxies at >4 sigma significance, and combining these with data from the literature we find a detection rate of 43+-14%, comparable to the detection rate for nearby radio galaxies, suggesting that group-dominant ellipticals may be more likely to contain molecular gas than their non-central counterparts. Those group-dominant galaxies which are detected typically contain ~2x10^8 Msol of molecular gas, and although most have low star formation rates (

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