How do atomic code uncertainties affect abundance measurements in the intracluster medium?

F. Mernier, N. Werner, K. Lakhchaura, J. de Plaa, L. Gu, J. S. Kaastra, J. Mao, A. Simionescu, I. Urdampilleta

Research output: Contribution to journalArticle

Abstract

Accurate chemical abundance measurements of X-ray emitting atmospheres pervading massive galaxies, galaxy groups, and clusters provide essential information on the star formation and chemical enrichment histories of these large scale structures. Although the collisionally ionised nature of the intracluster medium (ICM) makes these abundance measurements relatively easy to derive, underlying spectral models can rely on different atomic codes, which brings additional uncertainties on the inferred abundances. Here, we provide a simple, yet comprehensive comparison between the codes SPEXACT v3.0.5 (cie model) and AtomDB v3.0.9 (vapec model) in the case of moderate, CCD-like resolution spectroscopy. We show that, in cool plasmas (kT ≲ 2keV), systematic differences up to ~20% for the Fe abundance and ~45% for the O/Fe, Mg/Fe, Si/Fe, and S/Fe ratios may still occur. Importantly, these discrepancies are also found to be instrument-dependent, at least for the absolute Fe abundance. Future improvements in these two codes will be necessary to better address questions on the ICM enrichment.
Original languageEnglish
JournalAstronomische Nachrichten
Publication statusAccepted/In press - 31 Oct 2019

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galactic clusters
star formation
charge coupled devices
spectroscopy
code
histories
galaxies
plasma
atmospheres
atmosphere
history
x rays
chemical
comparison

Keywords

  • atomic data
  • atomic processes
  • galaxies
  • X-rays
  • clusters

Cite this

Mernier, F., Werner, N., Lakhchaura, K., Plaa, J. D., Gu, L., Kaastra, J. S., ... Urdampilleta, I. (Accepted/In press). How do atomic code uncertainties affect abundance measurements in the intracluster medium? Astronomische Nachrichten.
Mernier, F. ; Werner, N. ; Lakhchaura, K. ; Plaa, J. de ; Gu, L. ; Kaastra, J. S. ; Mao, J. ; Simionescu, A. ; Urdampilleta, I. / How do atomic code uncertainties affect abundance measurements in the intracluster medium?. In: Astronomische Nachrichten. 2019.
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abstract = "Accurate chemical abundance measurements of X-ray emitting atmospheres pervading massive galaxies, galaxy groups, and clusters provide essential information on the star formation and chemical enrichment histories of these large scale structures. Although the collisionally ionised nature of the intracluster medium (ICM) makes these abundance measurements relatively easy to derive, underlying spectral models can rely on different atomic codes, which brings additional uncertainties on the inferred abundances. Here, we provide a simple, yet comprehensive comparison between the codes SPEXACT v3.0.5 (cie model) and AtomDB v3.0.9 (vapec model) in the case of moderate, CCD-like resolution spectroscopy. We show that, in cool plasmas (kT ≲ 2keV), systematic differences up to ~20{\%} for the Fe abundance and ~45{\%} for the O/Fe, Mg/Fe, Si/Fe, and S/Fe ratios may still occur. Importantly, these discrepancies are also found to be instrument-dependent, at least for the absolute Fe abundance. Future improvements in these two codes will be necessary to better address questions on the ICM enrichment.",
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Mernier, F, Werner, N, Lakhchaura, K, Plaa, JD, Gu, L, Kaastra, JS, Mao, J, Simionescu, A & Urdampilleta, I 2019, 'How do atomic code uncertainties affect abundance measurements in the intracluster medium?', Astronomische Nachrichten.

How do atomic code uncertainties affect abundance measurements in the intracluster medium? / Mernier, F.; Werner, N.; Lakhchaura, K.; Plaa, J. de; Gu, L.; Kaastra, J. S.; Mao, J.; Simionescu, A.; Urdampilleta, I.

In: Astronomische Nachrichten, 31.10.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - How do atomic code uncertainties affect abundance measurements in the intracluster medium?

AU - Mernier, F.

AU - Werner, N.

AU - Lakhchaura, K.

AU - Plaa, J. de

AU - Gu, L.

AU - Kaastra, J. S.

AU - Mao, J.

AU - Simionescu, A.

AU - Urdampilleta, I.

PY - 2019/10/31

Y1 - 2019/10/31

N2 - Accurate chemical abundance measurements of X-ray emitting atmospheres pervading massive galaxies, galaxy groups, and clusters provide essential information on the star formation and chemical enrichment histories of these large scale structures. Although the collisionally ionised nature of the intracluster medium (ICM) makes these abundance measurements relatively easy to derive, underlying spectral models can rely on different atomic codes, which brings additional uncertainties on the inferred abundances. Here, we provide a simple, yet comprehensive comparison between the codes SPEXACT v3.0.5 (cie model) and AtomDB v3.0.9 (vapec model) in the case of moderate, CCD-like resolution spectroscopy. We show that, in cool plasmas (kT ≲ 2keV), systematic differences up to ~20% for the Fe abundance and ~45% for the O/Fe, Mg/Fe, Si/Fe, and S/Fe ratios may still occur. Importantly, these discrepancies are also found to be instrument-dependent, at least for the absolute Fe abundance. Future improvements in these two codes will be necessary to better address questions on the ICM enrichment.

AB - Accurate chemical abundance measurements of X-ray emitting atmospheres pervading massive galaxies, galaxy groups, and clusters provide essential information on the star formation and chemical enrichment histories of these large scale structures. Although the collisionally ionised nature of the intracluster medium (ICM) makes these abundance measurements relatively easy to derive, underlying spectral models can rely on different atomic codes, which brings additional uncertainties on the inferred abundances. Here, we provide a simple, yet comprehensive comparison between the codes SPEXACT v3.0.5 (cie model) and AtomDB v3.0.9 (vapec model) in the case of moderate, CCD-like resolution spectroscopy. We show that, in cool plasmas (kT ≲ 2keV), systematic differences up to ~20% for the Fe abundance and ~45% for the O/Fe, Mg/Fe, Si/Fe, and S/Fe ratios may still occur. Importantly, these discrepancies are also found to be instrument-dependent, at least for the absolute Fe abundance. Future improvements in these two codes will be necessary to better address questions on the ICM enrichment.

KW - atomic data

KW - atomic processes

KW - galaxies

KW - X-rays

KW - clusters

UR - https://arxiv.org/abs/1911.09684v1

UR - https://onlinelibrary.wiley.com/journal/15213994

M3 - Article

ER -

Mernier F, Werner N, Lakhchaura K, Plaa JD, Gu L, Kaastra JS et al. How do atomic code uncertainties affect abundance measurements in the intracluster medium? Astronomische Nachrichten. 2019 Oct 31.