Astronomy and Astrophysics – Astronomy
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98..260g&link_type=abstract
Astronomy and Astrophysics, vol. 98, no. 2, May 1981, p. 260-270.
Astronomy and Astrophysics
Astronomy
16
Andromeda Galaxy, Astronomical Maps, Continuous Radiation, Galactic Structure, Radio Sources (Astronomy), Disk Galaxies, Halos, Nebulae, Radial Distribution, Radiation Distribution
Scientific paper
The structure of the extended radio continuum emission around the Andromeda Galaxy is investigated in an attempt to set limits on the emission from a possible continuum halo. A 10 x 10 deg area field centered on M31 was mapped at 842 MHz by the Effelsberg 100-m telescope with an angular resolution of 16 arcmin. In addition, a combination of the 408 MHz synthesis map of Pooley (1969) and the all-sky Effelsberg survey of Haslam et al. (1974) is used to obtain a map of the galaxy and its surroundings with accurate large-scale structure and angular resolution of 4.5 arcmin. Following the subtraction of a complete set of point sources from the maps, at both frequencies there is found a spur of emission from the Galaxy which passes in front of M31. An enhancement of the emission in the region of the center of M31 is observed which might be attributable to a halo of brightness temperature less than 4.2 K at 408 MHz and less than 0.5 K at 842 MHz. The area of enhanced emission is found to have a diameter to half intensity of approximately 2.3 deg and an approximately spherical distribution similar to those of the Galactic halo. In addition, a power law spectral index for the disk emission of M31 between 102.5 and 842 MHz of 0.67 + or - 0.04 is derived.
Emerson Darrel T.
Graeve R.
Wielebinski Richard
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