Chandra deep observation of XDCP j0044.0-2033, a massive galaxy cluster at z > 1.5

P. Tozzi, J. S. Santos, Myung Kook Jee, R. Fassbender, P. Rosati, A. Nastasi, W. Forman, B. Sartoris, S. Borgani, H. Boehringer, B. Altieri, G. W. Pratt, M. Nonino, C. Jones

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Abstract

We report the analysis of the Chandra observation of XDCP J0044.0-2033, a massive, distant (z = 1.579) galaxy cluster discovered in the XDCP survey. The total exposure time of 380 ks with Chandra ACIS-S provides the deepest X-ray observation currently achieved on a massive, high-redshift cluster. Extended emission from the intra cluster medium (ICM) is detected at a very high significance level (S/N 20) on a circular region with a 44″ radius, corresponding to R ext = 375 kpc at the cluster redshift. We perform an X-ray spectral fit of the ICM emission modeling the spectrum with a single-temperature thermal mekal model. Our analysis provides a global temperature keV, and a iron abundance (error bars correspond to 1σ). We fit the background-subtracted surface brightness profile with a single β-model out to 44″, finding a rather flat profile with no hints of a cool core. We derive the deprojected electron density profile and compute the ICM mass within the extraction radius R ext = 375 kpc to be M ICM (r < R ext ) = (1.48 ± 0.20) × 10 13 M Under the assumption of hydrostatic equilibrium and assuming isothermality within R ext , the total mass is for kpc. Extrapolating the profile at radii larger than the extraction radius R ext we find for kpc. This analysis establishes the existence of virialized, massive galaxy clusters at redshift z 1.6, paving the way to the investigation of the progenitors of the most massive clusters today. Given its mass and the XDCP survey volume, XDCP J0044.0-2033 does not create significant tension with the WMAP-7 ΛCDM cosmology.

Original languageEnglish
Article number93
JournalAstrophysical Journal
Volume799
Issue number1
DOIs
Publication statusPublished - 2015 Jan 20

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galaxies
mass media
cosmology
hydrostatics
electron density
radii
temperature
iron
profiles
modeling
analysis
electron density profiles
brightness
x rays
exposure

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Tozzi, P., Santos, J. S., Jee, M. K., Fassbender, R., Rosati, P., Nastasi, A., ... Jones, C. (2015). Chandra deep observation of XDCP j0044.0-2033, a massive galaxy cluster at z > 1.5. Astrophysical Journal, 799(1), [93]. https://doi.org/10.1088/0004-637X/799/1/93
Tozzi, P. ; Santos, J. S. ; Jee, Myung Kook ; Fassbender, R. ; Rosati, P. ; Nastasi, A. ; Forman, W. ; Sartoris, B. ; Borgani, S. ; Boehringer, H. ; Altieri, B. ; Pratt, G. W. ; Nonino, M. ; Jones, C. / Chandra deep observation of XDCP j0044.0-2033, a massive galaxy cluster at z > 1.5. In: Astrophysical Journal. 2015 ; Vol. 799, No. 1.
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abstract = "We report the analysis of the Chandra observation of XDCP J0044.0-2033, a massive, distant (z = 1.579) galaxy cluster discovered in the XDCP survey. The total exposure time of 380 ks with Chandra ACIS-S provides the deepest X-ray observation currently achieved on a massive, high-redshift cluster. Extended emission from the intra cluster medium (ICM) is detected at a very high significance level (S/N 20) on a circular region with a 44″ radius, corresponding to R ext = 375 kpc at the cluster redshift. We perform an X-ray spectral fit of the ICM emission modeling the spectrum with a single-temperature thermal mekal model. Our analysis provides a global temperature keV, and a iron abundance (error bars correspond to 1σ). We fit the background-subtracted surface brightness profile with a single β-model out to 44″, finding a rather flat profile with no hints of a cool core. We derive the deprojected electron density profile and compute the ICM mass within the extraction radius R ext = 375 kpc to be M ICM (r < R ext ) = (1.48 ± 0.20) × 10 13 M Under the assumption of hydrostatic equilibrium and assuming isothermality within R ext , the total mass is for kpc. Extrapolating the profile at radii larger than the extraction radius R ext we find for kpc. This analysis establishes the existence of virialized, massive galaxy clusters at redshift z 1.6, paving the way to the investigation of the progenitors of the most massive clusters today. Given its mass and the XDCP survey volume, XDCP J0044.0-2033 does not create significant tension with the WMAP-7 ΛCDM cosmology.",
author = "P. Tozzi and Santos, {J. S.} and Jee, {Myung Kook} and R. Fassbender and P. Rosati and A. Nastasi and W. Forman and B. Sartoris and S. Borgani and H. Boehringer and B. Altieri and Pratt, {G. W.} and M. Nonino and C. Jones",
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Tozzi, P, Santos, JS, Jee, MK, Fassbender, R, Rosati, P, Nastasi, A, Forman, W, Sartoris, B, Borgani, S, Boehringer, H, Altieri, B, Pratt, GW, Nonino, M & Jones, C 2015, 'Chandra deep observation of XDCP j0044.0-2033, a massive galaxy cluster at z > 1.5', Astrophysical Journal, vol. 799, no. 1, 93. https://doi.org/10.1088/0004-637X/799/1/93

Chandra deep observation of XDCP j0044.0-2033, a massive galaxy cluster at z > 1.5. / Tozzi, P.; Santos, J. S.; Jee, Myung Kook; Fassbender, R.; Rosati, P.; Nastasi, A.; Forman, W.; Sartoris, B.; Borgani, S.; Boehringer, H.; Altieri, B.; Pratt, G. W.; Nonino, M.; Jones, C.

In: Astrophysical Journal, Vol. 799, No. 1, 93, 20.01.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Chandra deep observation of XDCP j0044.0-2033, a massive galaxy cluster at z > 1.5

AU - Tozzi, P.

AU - Santos, J. S.

AU - Jee, Myung Kook

AU - Fassbender, R.

AU - Rosati, P.

AU - Nastasi, A.

AU - Forman, W.

AU - Sartoris, B.

AU - Borgani, S.

AU - Boehringer, H.

AU - Altieri, B.

AU - Pratt, G. W.

AU - Nonino, M.

AU - Jones, C.

PY - 2015/1/20

Y1 - 2015/1/20

N2 - We report the analysis of the Chandra observation of XDCP J0044.0-2033, a massive, distant (z = 1.579) galaxy cluster discovered in the XDCP survey. The total exposure time of 380 ks with Chandra ACIS-S provides the deepest X-ray observation currently achieved on a massive, high-redshift cluster. Extended emission from the intra cluster medium (ICM) is detected at a very high significance level (S/N 20) on a circular region with a 44″ radius, corresponding to R ext = 375 kpc at the cluster redshift. We perform an X-ray spectral fit of the ICM emission modeling the spectrum with a single-temperature thermal mekal model. Our analysis provides a global temperature keV, and a iron abundance (error bars correspond to 1σ). We fit the background-subtracted surface brightness profile with a single β-model out to 44″, finding a rather flat profile with no hints of a cool core. We derive the deprojected electron density profile and compute the ICM mass within the extraction radius R ext = 375 kpc to be M ICM (r < R ext ) = (1.48 ± 0.20) × 10 13 M Under the assumption of hydrostatic equilibrium and assuming isothermality within R ext , the total mass is for kpc. Extrapolating the profile at radii larger than the extraction radius R ext we find for kpc. This analysis establishes the existence of virialized, massive galaxy clusters at redshift z 1.6, paving the way to the investigation of the progenitors of the most massive clusters today. Given its mass and the XDCP survey volume, XDCP J0044.0-2033 does not create significant tension with the WMAP-7 ΛCDM cosmology.

AB - We report the analysis of the Chandra observation of XDCP J0044.0-2033, a massive, distant (z = 1.579) galaxy cluster discovered in the XDCP survey. The total exposure time of 380 ks with Chandra ACIS-S provides the deepest X-ray observation currently achieved on a massive, high-redshift cluster. Extended emission from the intra cluster medium (ICM) is detected at a very high significance level (S/N 20) on a circular region with a 44″ radius, corresponding to R ext = 375 kpc at the cluster redshift. We perform an X-ray spectral fit of the ICM emission modeling the spectrum with a single-temperature thermal mekal model. Our analysis provides a global temperature keV, and a iron abundance (error bars correspond to 1σ). We fit the background-subtracted surface brightness profile with a single β-model out to 44″, finding a rather flat profile with no hints of a cool core. We derive the deprojected electron density profile and compute the ICM mass within the extraction radius R ext = 375 kpc to be M ICM (r < R ext ) = (1.48 ± 0.20) × 10 13 M Under the assumption of hydrostatic equilibrium and assuming isothermality within R ext , the total mass is for kpc. Extrapolating the profile at radii larger than the extraction radius R ext we find for kpc. This analysis establishes the existence of virialized, massive galaxy clusters at redshift z 1.6, paving the way to the investigation of the progenitors of the most massive clusters today. Given its mass and the XDCP survey volume, XDCP J0044.0-2033 does not create significant tension with the WMAP-7 ΛCDM cosmology.

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