Background starlight at the north and south celestial, ecliptic, and galactic poles

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Coordinates, Background Radiation, Milky Way Galaxy, Stellar Luminosity, Visible Spectrum, Asteroid Belts, Astronomical Maps, Pioneer 10 Space Probe, Stellar Color

Scientific paper

Isophotes of background starlight brightness (integrated starlight, diffuse galactic light, cosmic light) have been constructed near the celestial, ecliptic, and galactic poles from observations accumulated by the Pioneer 10 imaging photopolarimeter from beyond the asteroid belt. The brightness contributions of stars listed in the Yale Observatory Bright Star Catalogue, the U.S. Naval Observatory Photoelectric Catalogue (m less than 8), and the General Catalogue of Variable Stars were subtracted from the observations, giving the background starlight directly, since the zodiacal light was found to be negligible beyond the asteroid belt (Hanner et al., 1974; Schuerman et al., 1977). Blue (3950-4850 A) and red (5900-6900 A) data and the color index at the poles are presented and are compared with previous photometric and star count results for these regions. Estimates of the diffuse galactic light and extragalactic light in these regions are also obtained.

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