Distribution of near infrared sources in the galactic disk

Details Distribution of near infrared sources in the galactic disk Distribution of near infrared sources in the galactic disk

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100..116h&link_type=abstract

Astronomy and Astrophysics, vol. 100, no. 1, July 1981, p. 116-123. Research supported by the Japan Society for the Promotion o

Astronomy and Astrophysics

Astronomy

72

Brightness Distribution, Galactic Radio Waves, Galactic Structure, Near Infrared Radiation, Radiation Sources, Balloon-Borne Instruments, Observation Aircraft, Radio Sources (Astronomy), Spiral Galaxies, Stellar Evolution, Thermal Emission

Scientific paper

Results are presented of a near-infrared survey of galactic disk sources between longitudes of -70 and 50 deg. Observations were performed on balloon flights in the Northern and Southern Hemispheres at a wavelength of 2.4 microns, and in the Southern Hemisphere at 3.4 microns. The longitude distribution of surface brightness is found to show humps and steps in directions tangent to major spiral arms and corresponding to star formation regions near the sun. Latitudes of peak surface brightness are observed to deviate from the galactic equator in the same manner as various extreme population I objects, with the latitude brightness distribution not exhibiting an equatorial dip or flattening. The results are used in the formulation of a model of interstellar extinction and volume emissivity at 2.4 microns in terms of the clumpiness of dust clouds, and of an axially symmetric distribution of emissivity with ring and spheroidal components with a scale height of 50 pc, respectively. It is noted that the spiral arm association and the scale height of the sources suggest young cluster stars, although the absolute emissivity at 2.4 microns is much stronger than that expected from young stars concentrated in the galactic plane.

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