The soft X-ray spectrum of the Perseus cluster

Details The soft X-ray spectrum of the Perseus cluster The soft X-ray spectrum of the Perseus cluster

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198....1d&link_type=abstract

Astrophysical Journal, vol. 198, May 15, 1975, pt. 1, p. 1-6.

Computer Science

Sound

17

Galactic Clusters, Intergalactic Media, X Ray Spectra, Bremsstrahlung, Rocket Sounding, Spectrum Analysis, Thermal Radiation, X Ray Sources

Scientific paper

The X-ray spectrum of the Perseus cluster in the range 0.1-4.0 keV has been observed. Contrary to the results of previous low-energy rocket observations, no large flux of soft X-rays was found. The X-ray spectrum from 0.1 to 56 keV is consistent with bremsstrahlung from an intracluster gas with T approximately equal to 100 million K. attenuated by the interstellar column density inferred from 21-cm observations. The low-energy X-ray spectrum is not consistent with a nonthermal power-law model with the same slope as that observed at higher energies. The mass of hot intracluster gas required to produce the observed X-ray flux is a small fraction of the gravitational binding mass. The soft X-ray flux, when combined with limits on the radio flux, implies that the cluster is not gravitationally bounded by ionized gas at any temperature.

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