Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..425k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 2, p. 425-435
Astronomy and Astrophysics
Astrophysics
9
Astronomical Maps, Elliptical Galaxies, Galactic Halos, Galactic Structure, Interacting Galaxies, Intergalactic Media, Brightness Distribution, Ellipticity, Isophotes, Light Emission, Radio Emission, Schmidt Cameras, Spiral Galaxies
Scientific paper
Images of the giant elliptical galaxy IC 4296, and the wider field around it, are presented at differing contrast levels. The data comes from a co-added array of digitized Schmidt plates. The isophote map of IC 4296 suggests that the outer parts of the halo are elongated towards the nearby spiral IC 4299, indicative of a tidal interaction between the two galaxies. This is confirmed from the changes on position angle with radius of ellipses fitted to the iosphotes of IC 4296. The ellipticity of the isophotes also increases at the lowest surface brightnesses. The surface brightness profile (traced to less than 2% of the sky level) is found to be well represented by an R1/4 law in the inner regions but contains less light than this law suggests in the outermost regions investigated, suggesting that the outer regions of IC 4296 are tidally limited by IC 4299. On the high contrast print the halo has a diameter of approximately 0.16 Mpc. Possible optical emission is detected in the directions of peak radio emission asociated with the radio lobes of IC 4296. However, brighter diffuse optical emission is detected E of IC 4296 in a direction not associtated with any part of the radio source, presumably representing intergalctic media (IGM) of the IC 4296 group.
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