1998ApJ...499..608M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST07:10:51

1998ApJ...499..608M - Astrophys. J., 499, 608-613 (1998/June-1)

How abundant is iron in the core of the Perseus cluster?

MOLENDI S., MATT G., ANTONELLI L.A., FIORE F., FUSCO-FEMIANO R., KAASTRA J., MACCARONE C. and PEROLA C.

Abstract (from CDS):

The analysis of Perseus data collected with the Medium-Energy Concentrator Spectrometer (MECS) on board BeppoSAX shows that the ratio of the flux of the 8 keV line complex (dominated by Fe Kβ emission) to the 6.8 keV line complex (dominated by Fe Kα emission) is significantly larger than predicted by standard thermal emission codes. Moreover, the analysis of spatially resolved spectra shows that the above ratio decreases with increasing cluster radius. We find that, among the various explanations that we consider, the most likely requires the plasma to be optically thick for resonant scattering at the energy of the Fe Kα line. We argue that if this is the case, then measures of the iron abundance made using standard thermal emission codes that assume optically thin emission may significantly underestimate the true iron abundance. In the case of the core of Perseus, we estimate the true abundance to be ∼0.9 solar in a circular region with a radius of ∼60 kpc and centered on NGC 1275. Finally, we speculate that similar results may hold for the core of other rich clusters.

Abstract Copyright:

Journal keyword(s): Galaxies: Abundances - Galaxies: Clusters: Individual: Name: Perseus - Galaxies: Intergalactic Medium - Scattering - X-Rays: Galaxies

CDS comments: p. 609, A 664 misprint for A 644 ???

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2004 1
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3632 3
3 ACO 3266 ClG 04 31 11.9 -61 24 23           ~ 376 0
4 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 664 2
5 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4880 1
6 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5723 4
7 ACO 644 ClG 08 17 24.5 -07 30 46           ~ 207 0
8 ACO 664 ClG 08 24 50 +04 26.2           ~ 8 0
9 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6010 0
10 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504     11.08     ~ 624 1
11 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3997 0

    Equat.    Gal    SGal    Ecl

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