The X-Ray Flux Dipole of Active Galactic Nuclei and the Peculiar Motion of the Local Group
Abstract
An X-ray flux-lmiited sample of 30 AGNs detected with the HEAO I A-2 experiment, which is complete for |b| > 20^deg^, is used as a tracer of the total gravitational mass distribution in the nearby universe. The dipole moment of the flux saturates at about z = 0.017 and gives the direction (l, b) = (313^deg^, 38^deg^) with an error circle of about 30^deg^ in radius. This direction is 39^deg^ away from the direction of the Local Group's motion with respect to the microwave background radiation. The amphtude of the dipole is about 50% of the corresponding monopole. Applying our data to linear perturbation theory, we get a value of b{OMEGA}^-0.6^_0_ close to previous resultsd using optical galaxies and somewhat greater than values obtained from IRAS galaxies. This suggests that the X-ray emission from AGNs traces the underlying mass distribution at least as strongly as optical and IR emission from galaxies.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1990
- DOI:
- 10.1086/185694
- Bibcode:
- 1990ApJ...353L...3M
- Keywords:
-
- Active Galactic Nuclei;
- Cosmic X Rays;
- Local Group (Astronomy);
- Relic Radiation;
- Brightness Distribution;
- Gravitational Effects;
- Heao 1;
- Infrared Astronomy Satellite;
- Mass Distribution;
- Astrophysics;
- COSMOLOGY;
- GALAXIES: NUCLEI;
- X-RAYS: SOURCES