Z(abs) roughly equal to z(em) absorption systems in quasar spectra - a correlation with radio and optical luminosity

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/184979· OSTI ID:5748784

Moller, P; Jakobsen, P

The data of the quasar absorption line surveys of Young, Sargent, and Boksenberg (1982) and of Foltz et al. (1986) are combined to show that a two-parameter correlation between the presence of C IV z(abs) roughly equal to z(em) systems and both the radio and optical luminosity of the underlying quasar is present at the 95 percent confidence level. The sense of the correlation is such that radio-loud quasars fainter than M(V) of about -27 are four times more likely to contain z(abs) roughly equal to z(em) systems than are other categories of quasars. It is suggested that this correlation can be understood in the intervening cluster member interpretation of z(abs) roughly equal to z(em) systems. The discrepancy between the survey results can be understood as being due to the first sample containing many more optically selected, intrinsically bright quasars than the latter sample. 13 references.

• Research Organization: Universitetets Astronomiske Observatorium, Copenhagen, Denmark; ESA, Astrophysics Div., Noordwijk, Netherlands
• OSTI ID: 5748784
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 320; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
COSMIC RADIO SOURCES
COSMOLOGY
ELECTROMAGNETIC RADIATION
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
QUASARS
RADIATIONS
RADIOWAVE RADIATION
RED SHIFT
SPECTRA
VISIBLE RADIATION