Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt.........8l&link_type=abstract
Ph.D. Thesis California Univ., Los Angeles.
Astronomy and Astrophysics
Astronomy
2
Andromeda Galaxy, Galactic Bulge, Planetary Nebulae, Radial Distribution, Radial Velocity, Astronomical Photography, Brightness, Celestial Bodies, Dispersing
Scientific paper
Forty-two planetary nebulae were identified within the central 1 arcmin. (radius) of the nuclear bulge of M31 using 2.1A bandpass photographs. Each photograph was taken at a different central wavelength, which was varied by changing the temperature of the interference filter. The observed brightness of a planetary nebula in the field was thus modulated from photograph to photograph according to its location in velocity space. Radial velocities for 30 of the planetary nebulae were determined and radial velocity limits were placed on the remaining nebulae in the field. A radial velocity dispersion of 157(+ or - 24) km/sec was derived for the nebulae. From the observed velocity dispersion, the mass-to-light ratio of the inner nuclear bulge of M31, (M/LV) sub circled dot = 9.6 (+ or - 3.6), was obtained by application of the virial theorem.
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