The analysis of Abell 1835 using a deprojection technique

Abstract

We present the results from a detailed deprojection analysis of Abell 1835 as observed by {\it XMM-Newton}. If we fit the spectra with an isothermal plasma model, the deprojected temperature profile is flat in the outer region around 7.6 keV and decreases to $\sim$ 5.6 keV in the center, which may be connected with the gas cooling. In the central part, a two-component thermal plasma model can fit the spectrum significantly better. Moreover, the cool component (T $\sim$ 1.8 keV) has a much lower metal abundance than the hot component (T $\sim$ 8 keV), which may be due to the longer cooling time for the cool gas with lower abundance. In addition, it was found that without a main isothermal component, the standard cooling flow model cannot fit the spectrum satisfactorily. From the isothermal model fitting results we also derived the electron density $n_e$, and fitted its radial distribution with a double-$\beta$ model. The $n_e$ profile inferred with the double-$\beta$ model and the deprojected X-ray gas temperature profile were then combined to derive the total mass and the total projected mass of the cluster. The projected mass is lower than that derived from the weak lensing method. However, assuming that the cluster extends to a larger radius $\sim 15^{\prime }$ as found by Clowe & Schneider (2002), the two results are consistent within the error bars. Furthermore, we calculated the projected mass within the radius of $\sim$ 153 kpc implied by the presence of a gravitational lensing arc, which is about half of the mass determined from the optical lensing.

10 pages, 9 figures, Accepted for A&A

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Cited by in corpus (11)

• Gravitational Lensing
• The Starburst in the Abell 1835 Cluster Central Galaxy: A Case Study of Galaxy Formation Regulated by an Outburst from a Supermassive Black Hole
• Scaling relations and mass calibration of the X-ray luminous galaxy clusters at z~0.2: XMM-Newton observations
• Joint Analysis of Cluster Observations: I. Mass Profile of Abell 478 from Combined X-ray, Sunyaev-Z'eldovich, and Weak Lensing Data
• Suzaku observations of Abell 1835 outskirts: Deviation from hydrostatic equilibrium
• The Enrichment of the Intracluster Medium
• XMM-Newton studies of a massive cluster of galaxies: RXCJ2228.6+2036
• A good mass proxy for galaxy clusters with XMM-Newton
• Deprojected analysis of Abell 1835 observed with Chandra and compared with XMM-Newton
• Unbiased Correction Relations for Galaxy Cluster properties Derived from Chandra and XMM-Newton
• The ${\mathrm{Y}}_{\mathrm{SZ},\mathrm{Planck}}-{\mathrm{Y}}_{\mathrm{SZ},\mathrm{XMM}}$ scaling relation and its difference between cool-core and non-cool-core clusters