Skip to main content

Research Repository

Advanced Search

Galaxy And Mass Assembly: search for a population of high-entropy galaxy groups

Pearson, R.J.; Ponman, T.J.; Norberg, P.; Robotham, A.S.G.; Babul, A.; Bower, R.G.; McCarthy, I.G.; Brough, S.; Driver, S.P.; Pimbblet, K.

Galaxy And Mass Assembly: search for a population of high-entropy galaxy groups Thumbnail


Authors

R.J. Pearson

T.J. Ponman

A.S.G. Robotham

A. Babul

R.G. Bower

I.G. McCarthy

S. Brough

S.P. Driver

K. Pimbblet



Abstract

Observations with the ChandraX-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 ∼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 2σ lower limits on their gas entropy, are candidates for the population of high-entropy groups predicted by some active galactic nucleus feedback models.

Citation

Pearson, R., Ponman, T., Norberg, P., Robotham, A., Babul, A., Bower, R., …Pimbblet, K. (2017). Galaxy And Mass Assembly: search for a population of high-entropy galaxy groups. Monthly Notices of the Royal Astronomical Society, 469(3), 3489-3504. https://doi.org/10.1093/mnras/stx1081

Journal Article Type Article
Acceptance Date May 3, 2017
Online Publication Date May 6, 2017
Publication Date Aug 11, 2017
Deposit Date Jul 18, 2017
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 469
Issue 3
Pages 3489-3504
DOI https://doi.org/10.1093/mnras/stx1081

Files

Published Journal Article (8.6 Mb)
PDF

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.





You might also like



Downloadable Citations