Optical and x-ray properties of x-ray selected active galactic nuclei

Journal Article · Fri Oct 01 04:00:00 EDT 1982 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160317· OSTI ID:6423351

Kriss, G A; Canizares, C R

In a systematic program of optical studies of X-ray sources discovered serendipitously with the Einstein Observatory, we have identified and studied 25 new X-ray selected active galactic nuclei (AGN). The objects cover a range of 0.06 to 1 in redshift, 2 x 10/sup 43/ to 5 x 10/sup 45/ ergs s/sup -1/ in X-ray luminosity, and 14.4. to 20.3 in V magnitude. The X-ray selected AGN together with optically selected Seyfert 1 galaxies studied previously form a smooth distribution of objects over four orders of magnitude in absolute luminosity and share similar optical and X-ray properties. The mean redshifts and luminosities of the X-ray selected AGN are higher than those of the Seyferts and lower than those of several optically selected QSOs studied by others. This is readily explained as the result of selection effects on the steep X-ray luminosity function.

• Research Organization: Department of Physics and Center for Space Research, Massachusetts Institute of Technology
• OSTI ID: 6423351
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 261:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640103 -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BALMER LINES
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
GALAXIES
GALAXY NUCLEI
LINE WIDTHS
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
QUASARS
RED SHIFT
SEYFERT GALAXIES
SPECTRA
VISIBLE SPECTRA
X-RAY SPECTRA