Euclidean slope of the X-ray source counts: a cosmic conspiracy

Conference · Sun Jan 01 00:00:00 EST 1984 · Adv. Space Res.; (United States)

OSTI ID:6237078

Gioia, I M; Maccacaro, T

The selection criteria adopted for the Einstein Observatory Medium Sensitivity survey are delineated and the results of an analysis of the source-count relation for extragalactic X ray sources is presented. Only IPC fields at least 20 deg outside of the galactic plane, and then only those images in the center of the fields, were included. A total of 345 objects were sighted in the 0.3-3.5 keV energy interval, and 77 percent were concluded to be extragalactic. Most were associated with active galactic nuclei (AGN), including Seyfert galaxies and quasars, and galactic clusters. A slope of about 1.7 was calculated for the power law of the energy spectra of AGNs and close to 1.0 for clusters. 10 references.

• Research Organization: Harvard-Smithsonian Center for Astrophysics, Cambridge, MA
• OSTI ID: 6237078
• Report Number(s): CONF-8307144-
• Journal Information: Adv. Space Res.; (United States), Vol. 3; Conference: Symposium on high-energy astrophysics and cosmology, Pamporovo, Bulgaria, 18 Jul 1983
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC X-RAY SOURCES
ENERGY SPECTRA
GALAXY NUCLEI
INTERGALACTIC SPACE
QUASARS
RED SHIFT
SEYFERT GALAXIES
SPECTROSCOPY
STARS
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
GALAXIES
SPACE
SPECTRA
640103* - Astrophysics & Cosmology- Quasi-Stellar
Radio
& X-Ray Sources- (-1987)