Extinction and the Wavelength Dependent Positions of the Nuclei of NGC 6240

Details Extinction and the Wavelength Dependent Positions of the Nuclei of NGC 6240 Extinction and the Wavelength Dependent Positions of the Nuclei of NGC 6240

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..416s&link_type=abstract

Astronomy and Astrophysics 277, 416

Astronomy and Astrophysics

Astrophysics

12

Scientific paper

The ultraluminous IR galaxy NGC 6240 contains two apparent nuclei visible in the ultraviolet, optical, near in-frared and radio regimes. We measured the positions of the nuclei on ground-based U, B, V R, z and I-band images with reference to astrometric standards. The B, V R, z positions of the southern nucleus show a systematic trend with wavelength, which is consistent with dust extinction towards the northern nucleus. The southern compact radio source is located at the long- wavelength side of the southern nucleus, while the northern compact radio source is significantly offset (by more than 0.3") to the south of its optical counterpart. We conclude that the 2 cm radio nuclei do not have compact optical counterparts which is probably caused by extinction in the molecular cloud complex between the nuclei. A simple model indicates more than 3 mag blue extinction through a screen partially covering the nuclei.

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