The optical halo around NGC 253

Details The optical halo around NGC 253 The optical halo around NGC 253

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106..112b&link_type=abstract

Astronomy and Astrophysics, vol. 106, no. 1, Feb. 1982, p. 112-114.

Astronomy and Astrophysics

Astrophysics

21

Astronomical Photography, Densitometers, Galactic Structure, Halos, Stellar Luminosity, Data Smoothing, Digital Data, Image Enhancement, Synchrotron Radiation

Scientific paper

A photographic technique of image enhancement and digital smoothing of P.D.S. scans are used to study the blue light from an extended halo surrounding NGC 253. The photographic technique, described by Malin (1978), is based on the fact that the true image is formed in the topmost surface layer of the emission of a plate, while the fog is found in deeper layers of the emulsion. The investigation made it possible to follow the distribution of light out to 10 kpc from the plane of the galaxy. Synchrotron emission is responsible for the bulk of radio continuum emission in NGC 253 (Beck et al., 1979). Moreover, the radio map at a wavelength of 3.4 cm shows a spur-like feature at the exact position where the diffuse loop of light is seen, indicating a similar emission origin.

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