2013A&A...552A..47K


Query : 2013A&A...552A..47K

2013A&A...552A..47K - Astronomy and Astrophysics, volume 552A, 47-47 (2013/4-1)

Cross-calibration of Suzaku/XIS and XMM-Newton/EPIC using galaxy clusters.

KETTULA K., NEVALAINEN J. and MILLER E.D.

Abstract (from CDS):

We extend a previous cross-calibration study conducted by the International Astronomical Consortium for High Energy Calibration (IACHEC) on XMM-Newton/EPIC, Chandra/ACIS and BeppoSAX/MECS X-ray instruments with galaxy clusters to Suzaku/XIS instruments. Our aim is to study the accuracy of the energy-dependent effective area calibration of the XIS instruments using observations during 2005-2008. We performed a spatially resolved X-ray spectral analysis on Suzaku/XIS and XMM-Newton/EPIC-pn data for a sample of galaxy clusters. We extracted spectra from 3-6arcmin annular regions. By comparing the spectroscopic temperatures, fluxes, and fit residuals obtained with different instruments for the same cluster, we evaluated the systematic uncertainties of the energy dependence and the normalisation of the effective area between different detectors. The temperatures measured in the hard 2.0-7.0keV energy band with all instruments are consistent within ∼5%. Thus Suzaku/XIS can be added to the previously found list of instruments with good agreement of the effective area shape in the hard band (XMM-Newton/EPIC, Chandra/ACIS and BeppoSAX/MECS). However, using the public calibration, the temperatures obtained with the XIS instruments in the soft 0.5-2.0keV band disagree by 9-29%. We investigated residuals in the XIS soft band, which showed that if the XIS0 effective area shape is accurately calibrated, the effective areas of XIS1 and XIS3 are overestimated below ∼1.0keV (or vice versa), with the difference increasing to ∼20% at 0.5keV. Adjustments to the modelling of the column density of the XIS contaminant in the 3-6arcmin extraction region while forcing consistent emission models in each instrument for a given cluster significantly improved the fits. Assuming the composition of the contaminant as in the public calibration, the oxygen column density in the XIS1 and XIS3 contaminants must be increased by ∼1-2x1017cm2 in comparison to the values implemented in the current calibration, while the column density of the XIS0 contaminant given by the analysis is consistent with the public calibration. This indicates that the effective area shape of XIS0 in the soft band is more accurately modelled in the public calibration than that of XIS1 and XIS3. XIS soft band temperatures obtained with the modification to the column density of the contaminant agree better with temperatures obtained with the EPIC-pn instrument of XMM-Newton than with those derived using the Chandra/ACIS instrument. However, as the hard band data of the Suzaku/XIS and EPIC-pn instruments yield a maximum systematic uncertainty of 10% on the derived fluxes, comparing the hard band fluxes obtained using Suzaku/XIS to fluxes obtained using the Chandra/ACIS and EPIC-pn instruments proved inconclusive.

Abstract Copyright:

Journal keyword(s): instrumentation: miscellaneous - techniques: spectroscopic - galaxies: clusters: intracluster medium - X-rays: galaxies: clusters

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 SNR B0102-72.3 SNR 01 04 01.2 -72 01 52           ~ 381 1
2 ACO 262 ClG 01 52 50.4 +36 08 46           ~ 680 1
3 2MAXI J0254+416 ClG 02 54 32.2 +41 35 10           ~ 305 1
4 ACO 3112 ClG 03 17 52.4 -44 14 35           ~ 298 1
5 ACO 496 ClG 04 33 30.3838 -13 14 21.584           ~ 674 2
6 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 813 1
7 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 1031 2
8 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4575 2
9 ACO 1795 ClG 13 49 00.5 +26 35 07           ~ 1212 0
10 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3417 1
11 NAME Triangulum Australis Cluster ClG 16 38 16.1 -64 20 50           ~ 110 0
12 NAME LHB X 16 42.0 +02 19           ~ 306 0
13 RX J1856.6-3754 Psr 18 56 35.11 -37 54 30.5     25.7     ~ 416 0
14 QSO B2155-304 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1664 1

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2022.12.03-16:58:43

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