HEAO 1 observations of the Perseus cluster above 10 keV

Primini, F. A.; Basinska, E. M.; Howe, S. K.; Lang, F. L.; Levine, A. M.; Lewin, W. H. G.; Rothschild, R.; Baity, W. A.; Gruber, D.; Knight, F. K.; Matteson, J. L.; Lea, S. M.; Reichert, G. A.

doi:10.1086/183433

Cited by 23 publications

(8 citation statements)

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“…XMM-Newton observations (Churazov et al 2003) showed that the central region is contaminated by the emission of the AGN hosted by the brightest galaxy in Perseus, NGC 1275. A hard X-ray component has been detected with HEAO 1 by Primini et al (1981). Nevalainen et al (2004) used BeppoSAX and previous Rossi X-Ray Timing Explorer (RXTE) measurements to prove that this nonthermal component is variable and must therefore be connected to the central bright AGN.…”

Section: Perseusmentioning

confidence: 99%

GALAXY CLUSTERS IN THESWIFT/BURST ALERT TELESCOPE ERA: HARD X-RAYS IN THE INTRACLUSTER MEDIUM

Ajello

Rebusco

Cappelluti

et al. 2008

ApJ

101

126

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We report the detection of 10 clusters of galaxies in the ongoing Swift/Burst Alert Telescope (BAT) all-sky survey. This sample, which mostly comprises merging clusters, was serendipitously detected in the 15-55 keV band. We use the BAT sample to investigate the presence of excess hard X-rays above the thermal emission. The BAT clusters do not show significant (e.g., 2σ ) nonthermal hard X-ray emission. The only exception is represented by Perseus whose high-energy emission is likely due to NGC 1275. Using XMM-Newton, Swift/XRT, Chandra and BAT data, we are able to produce upper limits of the inverse Compton (IC) emission mechanism which are in disagreement with most of the previously-claimed hard X-ray excesses. The coupling of the X-ray upper limits of the IC mechanism to radio data shows that, in some clusters, the magnetic field might be larger than 0.5 μG. We also derive the first log N-log S and luminosity function distributions of galaxy clusters above 15 keV.

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Section: Perseusmentioning

confidence: 99%

GALAXY CLUSTERS IN THESWIFT/BURST ALERT TELESCOPE ERA: HARD X-RAYS IN THE INTRACLUSTER MEDIUM

Ajello

Rebusco

Cappelluti

et al. 2008

ApJ

101

126

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“…HEAO 1 observations showed emission at energies from 10-93 keV with no obvious variability (Primini et al 1981). Later observations with CGRO/OSSE failed to detect NGC 1275 in the 50-500 keV energy range with upper limits significantly below the fluxes observed during earlier missions (Osako et al 1994 (Reimer et al 2003) while the Fermi/LAT detects NGC 1275 with variations on monthly timescales with an average best fit power law spectral index of Γ = 2.13 (Kataoka et al 2010).…”

Section: Ngc 1275mentioning

confidence: 90%

Earth occultation imaging of the low energy gamma-ray sky with GBM

Rodi

Cherry

Case

et al. 2014

A&A

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Aims. The Earth Occultation Technique (EOT) has been applied to Fermi's Gamma-ray Burst Monitor (GBM) to perform all-sky monitoring for a predetermined catalog of hard X-ray/soft γ-ray sources. In order to search for sources not in the catalog, thus completing the catalog and reducing a source of systematic error in EOT, an imaging method has been developed -Imaging with a Differential filter using the Earth Occultation Method (IDEOM). Methods. IDEOM is a tomographic imaging method that takes advantage of the orbital precession of the Fermi satellite. Using IDEOM, all-sky reconstructions have been generated for ∼4 years of GBM data in the 12-50 keV, 50-100 keV and 100-300 keV energy bands in search of sources otherwise unmodeled by the GBM occultation analysis. Results. IDEOM analysis resulted in the detection of 57 sources in the 12-50 keV energy band, 23 sources in the 50-100 keV energy band, and 7 sources in the 100-300 keV energy band. Seventeen sources were not present in the original GBM-EOT catalog and have now been added. We also present the first joined averaged spectra for four persistent sources detected by GBM using EOT and by the Large Area Telescope (LAT) on Fermi: NGC 1275, 3C 273, Cen A, and the Crab.

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“…NGC 1275 in the Perseus cluster; Branduardi-Raymont et al 19~I;Primini et al 1981), but no extended sources of non-thermal emission have been confirmed.…”

Section: General Propertiesmentioning

confidence: 97%

X-ray emission from clusters of galaxies

Fabian

1985

Space Sci Rev

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The X-ray emission from the intracluster gas is a rich source of information on the metal abundance, evolution and mass profile of clusters.Methods for determining the mass of gas are reviewed; the total mass is uncertain.The best data so far available concentrate on the cluster core.Cooling flows are found within the cores of a significant fraction of rich and poor clusters, as well as in relatively isolated elliptical galaxies.

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HEAO 1 observations of the Perseus cluster above 10 keV

Cited by 23 publications

References 0 publications

GALAXY CLUSTERS IN THESWIFT/BURST ALERT TELESCOPE ERA: HARD X-RAYS IN THE INTRACLUSTER MEDIUM

GALAXY CLUSTERS IN THESWIFT/BURST ALERT TELESCOPE ERA: HARD X-RAYS IN THE INTRACLUSTER MEDIUM

Earth occultation imaging of the low energy gamma-ray sky with GBM

X-ray emission from clusters of galaxies

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