Density-wave interpretation of the Mars 7 and Venera 9 interstellar-gas velocity measurements

Details Density-wave interpretation of the Mars 7 and Venera 9 interstellar-gas velocity measurements Density-wave interpretation of the Mars 7 and Venera 9 interstellar-gas velocity measurements

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pazh...10..908g&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 10, Dec. 1984, p. 908-911) Soviet Astronomy Letters (ISSN 0360-0327), vol. 10, Nov.-Dec

Astronomy and Astrophysics

Astronomy

Density Wave Model, Gas Flow, Interstellar Gas, Milky Way Galaxy, Velocity Measurement, Flow Velocity, Mars 7 Spacecraft, Solar System, Spiral Galaxies, Venera 9 Satellite

Scientific paper

The measurements of the velocity of interstellar gas in the solar system obtained by the Mars 7 and Venera 9 probes (Bertaux et al., 1976 and 1978) are analyzed in the framework of the density-wave theory of spiral galaxies (Lin et al., 1969), assuming that the gas motion comprises a basic circular motion, a random component arising from a nearby disturbance such as a supernova outburst, and a systematic noncircular motion induced by the gravity field of a spiral density wave. Other assumed parameters include spiral-pattern pitch angle = 7 deg, spiral radius at the sun = 10 kpc, local adiabatic sound speed = 9 km/s, angular rotation velocity at the sun = 25 km/s kpc, and phase angle Phi0 = -180 deg (locating the sun midway between the Perseus and Sagittarius arms). The angular speed of the spiral pattern is calculated as 12-16 km/s kpc, with a perturbation of 5-10 percent in the underlying Galactic potential.

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