X-Ray temperature and mass measurements to the virial radius of abell 1413 with suzaku

Akio Hoshino, J. Patrick Henry, Kosuke Sato, Hiroki Akamatsu, Wataru Yokota, Shin Sasaki, Yoshitaka Ishisaki, Takaya Ohashi, Marshall Bautz, Yasushi Fukazawa, Naomi Kawano, Akihiro Furuzawa, Kiyoshi Hayashida, Noriaki Tawa, John P. Hughes, Motohide Kokubun, Takayuki Tamura

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Abstract

We present X-ray observations of the northern outskirts of the relaxed galaxy cluster A 1413 with Suzaku, whose XIS instrument has the low intrinsic background needed to make measurements of these low surface brightness regions. We excised 15 point sources superimposed on the image above a flux of 1x10 -14 erg cm-2s-1 (2-10 ke V) using XMM-Newton and Suzaku images of the cluster. We quantified all known systematic errors as part of our analysis, and showed that our statistical errors encompass them for the most part. Our results extend previous measurements with Chandra and XMM-Newton, and show a significant temperature drop to about 3 ke V at the virial radius, r200. Our entropy profile in the outer region (> 0.5 r200) joins smoothly onto that of XMM-Newton, and shows a flatter slope compared with simple models, similar to a few other clusters observed at the virial radius. The integrated mass of the cluster at the virial radius is approximately 7.5 x 1014 M⊙, and varies by about 30%, depending on the particular method used to measure it.

Original languageEnglish
Pages (from-to)371-389
Number of pages19
JournalPublications of the Astronomical Society of Japan
Volume62
Issue number2
DOIs
Publication statusPublished - 25-04-2010

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Hoshino, A., Henry, J. P., Sato, K., Akamatsu, H., Yokota, W., Sasaki, S., Ishisaki, Y., Ohashi, T., Bautz, M., Fukazawa, Y., Kawano, N., Furuzawa, A., Hayashida, K., Tawa, N., Hughes, J. P., Kokubun, M., & Tamura, T. (2010). X-Ray temperature and mass measurements to the virial radius of abell 1413 with suzaku. Publications of the Astronomical Society of Japan, 62(2), 371-389. https://doi.org/10.1093/pasj/62.2.371