Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.279..510h&link_type=abstract
Nature, vol. 279, June 7, 1979, p. 510-512. Research supported by the Japan Society for the Promotion of Science and Yamada Scie
Physics
21
Galactic Radiation, Longitude Measurement, Milky Way Galaxy, Near Infrared Radiation, Stellar Luminosity, Australia, Balloon-Borne Instruments, Brightness, Disks (Shapes), Galactic Bulge, Hydrogen Clouds, Interstellar Extinction, Star Distribution, Surface Temperature
Scientific paper
The structure of the southern galactic plane in the near infrared is investigated by means of balloon observations. A liquid nitrogen-cooled telescope system was used to survey the galactic plane at galactic longitudes between 290 and 20 deg at the wavelengths of 2.4 and 3.4 microns. Contour maps of surface brightness at 2.4 microns reveal humps asymmetric with respect to the galactic center, attributed to the spiral structure of the galaxy. A relative color difference of 0.3 magnitudes is found between the disk and galactic center directions, corresponding to excess interstellar extinction in the disk direction. Peak surface brightness is found to be displaced from the galactic equator in the regions of the bright humps. The lack of an absorption feature in the galactic plane is considered due to a large concentration of IR sources, indicating the presence of young stars. The observed asymmetry of the galactic center region suggests a disk-like structure on which the central bulge is superimposed.
Hayakawa Saito
Matsumoto Toshio
Murakami Hitoshi
Thomas Jacquelyn A.
Uyama K.
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