Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....48....1s&link_type=abstract
Astronomy and Astrophysics, vol. 48, no. 1, Apr. 1976, p. 1-10.
Astronomy and Astrophysics
Astrophysics
20
Astronomical Maps, Background Radiation, Galactic Radio Waves, Galactic Structure, Isophotes, Spiral Galaxies, Continuous Radiation, Frequency Distribution, Halos, Nonthermal Radiation, Radio Emission, Relief Maps
Scientific paper
An isophotal map is constructed for the brightness distribution of the galactic radio-continuum background on the assumption that nonthermal radio emission is enhanced in space up to about 1 kpc above the spiral arms. The model map agrees well with observed maps in many characteristics, particularly in the galactic spurs. The existence of Loops II and III is doubtful; they appear to be the result of superpositions of numerous spurs along the spiral arms. Detailed inspection of the observed radio maps reveals a systematic inclination of spur-ridges by 20-30 deg toward the anticenter sides in the inner region of the Galaxy. The inclination suggests some horizontal force on the inner spurs. The force might be the result of the dynamic pressure of a galactic wind or a horizontal stream of gas blowing in the halo. The spurs might therefore be promising probes for investigating the dynamic structure of the galactic gaseous halo.
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