Detection of an optical halo surrounding the spiral galaxy NGC 4565

Details Detection of an optical halo surrounding the spiral galaxy NGC 4565 Detection of an optical halo surrounding the spiral galaxy NGC 4565

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218l...7h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 218, Nov. 15, 1977, p. L7-L11. Research supported by the Bartol Rese

Mathematics

Logic

37

Astronomical Photometry, Galactic Structure, Spiral Galaxies, Brightness, Cosmology, Halos

Scientific paper

An optically luminous halo has been detected out to a distance of 34 kpc from the plane of the giant spiral galaxy NGC 4565 by using a photometer which scans along an annular path. At this distance the halo was observed to have a surface brightness equal to approximately 1 part in 1000 of the night sky in the spectral band of the instrument. Preliminary color data indicate that the observed light is emitted by stars redder than K7 and is suggestive of a massive halo of cosmological significance.

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