Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 469, Issue 3, Pages 3489-3504Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx1081
Keywords
galaxies: clusters: intracluster medium; galaxies: groups: general; X-rays; galaxies: clusters
Categories
Funding
- STFC Postgraduate Studentship
- Science and Technology Facilities Council [ST/L00075X/1, ST/P000541/1]
- Royal Society through the award of a University Research Fellowship
- NSERC (Canada)
- Pauli Center for Theoretical Studies ETH UZH
- STFC Advanced Fellowship
- STFC (UK)
- ARC (Australia)
- AAO
- STFC [ST/L00075X/1, ST/J001465/1, ST/F007159/1, ST/P000541/1, ST/L00061X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L00075X/1, ST/M000966/1, ST/F007159/1, ST/P000541/1, ST/J001465/1, ST/L00061X/1] Funding Source: researchfish
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Observations with the Chandra X-ray Observatory are used to examine the hot gas properties within a sample of 10 galaxy groups selected from the Galaxy And Mass Assembly survey's optical Friends-of-Friends group catalogue. Our groups have been screened to eliminate spurious and unrelaxed systems, and the effectiveness of this procedure is demonstrated by the detection of intergalactic hot gas in 80 per cent of our sample. However, we find that 9 of the 10 are X-ray underluminous by a mean factor of similar to 4 compared to typical X-ray-selected samples. Consistent with this, the majority of our groups have gas fractions that are lower and gas entropies somewhat higher than those seen in typical X-ray-selected samples. Two groups, which have high 2 sigma lower limits on their gas entropy, are candidates for the population of high-entropy groups predicted by some active galactic nucleus feedback models.
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