The X-ray luminosity-temperature relation of a complete sample of low-mass galaxy clusters

Siwei Zou, B. J. Maughan, P. A. Giles, A. Vikhlinin, F. Pacaud, R. Burenin, A. Hornstrup

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We present Chandra observations of 23 galaxy groups and low-mass galaxy clusters at 0.03 < z < 0.15 with a median temperature of ∼2keV. The sample is a statistically complete flux-limited subset of the 400 deg2 survey. We investigated the scaling relation between X-ray luminosity (L) and temperature (T), taking selection biases fully into account. The logarithmic slope of the bolometric LT relation was found to be 3.29 ± 0.33, consistent with values typically found for samples of more massive clusters. In combination with other recent studies of the LT relation, we show that there is no evidence for the slope, normalization, or scatter of the LT relation of galaxy groups being different than that of massive clusters. The exception to this is that in the special case of the most relaxed systems, the slope of the core-excised LT relation appears to steepen from the self-similar value found for massive clusters to a steeper slope for the lower mass sample studied here. Thanks to our rigorous treatment of selection biases, these measurements provide a robust reference against which to compare predictions of models of the impact of feedback on the X-ray properties of galaxy groups.
Original languageEnglish
Pages (from-to)820-831
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date10 Aug 2016
Publication statusPublished - 24 Oct 2016


  • methods: observational
  • methods: statistical
  • galaxies: clusters: general
  • galaxies: clusters: intracluster medium
  • galaxies: groups: general
  • X-rays: galaxies: clusters

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