Near-infrared profiles of the central region of M 31 were observed at wavelengths 1.0 m and 2.2 i m. The flux with respect to the angular distance from the center is well represented by the r ' 4 formula for ', and the effective radius of the spheroidal component decreases as the wavelength increases. This favors the giant-rich stellar synthesis and the equipartition of stellar kinetic energy; namely, massive stars that have evolved to the giant stage exist more abundantly in the central region. Key words: Central bulge; Infrared observation; M 31; Stellar synthesis.
Publications of the Astronomical Society of Japan
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