Published February 1, 1986 | Version v1
Journal article Metadata-only

On the completeness of a sample of bright quasars selected by colour excess in the direction of the North Galactic Pole

Creators

  • 1. SASC Technoligies, Inc., Lanham, MD (USA)
  • 2. Pennsylvania State Univ., University Park (USA). Dept. of Astronomy
  • 3. Virginia Polytechnic Inst. and State Univ., Blacksburg (USA). Dept. of Physics
  • 4. National Optical Astronomy Observatories, Tucson, AZ (USA)

Description

The Medium Bright Quasar survey (MBQS) shows evidence for a dearth of bright quasars in a Palomar Schmidt field centred on Selected Area (SA) 57 near the North Galactic Pole, compared to similar fields centred on SA 28, 29, 55, and 94. The SA 57 field has been searched again for bright quasar candidates with the held of a second survey plate exposed according to a slightly modified Haro-Luyten three-colour (Tonantzintla) prescription. Candidates so selected have both a blue and ultraviolet excess (B-UVX). The main result of the paper is that there appear to be no B-UVX quasars in the SA 57 field that are brighter than B=17.25 mag. The significance of this apparent anomaly is briefly discussed. (author)

Additional details

Publishing Information

Journal Title
Mon. Not. R. Astron. Soc.
Journal Volume
218
Journal Issue
3
Series
Mon. Not. R. Astron. Soc.
Journal Page Range
445-451
ISSN
0035-8711
CODEN
MNRAA

INIS

Country of Publication
United Kingdom
Country of Input or Organization
United Kingdom
INIS RN
17042078
Subject category
S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
Descriptors DEI
BRIGHTNESS; COLOR; DISTRIBUTION; IMAGES; QUASARS; SAMPLING; VISIBLE RADIATION
Descriptors DEC
COSMIC RADIO SOURCES; ELECTROMAGNETIC RADIATION; OPTICAL PROPERTIES; ORGANOLEPTIC PROPERTIES; PHYSICAL PROPERTIES; RADIATIONS

Optional Information

Contract/Grant/Project number
Grant AST 81-17864