THE DISTRIBUTION OF BARYON MATTER IN THE NEARBY X-RAY GALAXY CLUSTERS

Автор(и)

  • Iu. V. Babyk Main Astronomical Observatory of NAS of Ukraine, Kyiv, Ukraine;, Україна
  • I. B. Vavilova Main Astronomical Observatory of NAS of Ukraine, Kyiv, Ukraine, Україна

DOI:

https://doi.org/10.18524/1810-4215.2012.25.83328

Ключові слова:

Galaxy clusters, X-ray galaxy clusters.

Анотація

We present the results on the distribution of baryon matter in the galaxy clusters (z < 0.2), based on the Chandra X-ray Observatory data. The observed surface brightness profiles were approximated by β- model, which provides a good fit for all clusters. We found a correlation between cluster's radius R200 and temperature T , taking into account that their measurements are statistically independent because of the mass of gas is almost independent on cluster's temperature: R200 = 850 kpc x T 0.61±0.04 keV. We obtained an empirical relation for a total mass of baryon matter (intercluster medium and galaxies), and the upper limit (25-30%) on its changes in a total mass of nearby X-ray galaxy clusters.

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Опубліковано

2012-11-15

Номер

Том 25 № 2 (2012)

Розділ

Статті

Ліцензія

Авторське право (c) 2012 Odessa Astronomical Publications

Creative Commons License

Ця робота ліцензується відповідно до Creative Commons Attribution-NonCommercial 4.0 International License.

Відповідно Закону України про авторське право і суміжні права N 3792-XII від 23 грудня 1993 року