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Published June 1, 1985 | Published
Journal Article Open

The IRAS galaxy 0421 + 040P06 - an active spiral (?) galaxy with extended radio lobes


The infrared bright galaxy 0421 + 040P06 detected by IRAS at 25 and 60 μm has been studied at optical, infrared, and radio wavelengths. It is a luminous galaxy with apparent spiral structure emitting 4 x 10^(37) W (1 x 10^(11) L_☉) from far-infrared to optical wavelengths, assuming H_0 = 75 km s^(-1) Mpc^(-1). Optical spectroscopy reveals a Seyfert 2 emission-line spectrum, making 0421 +040P06 the first active galaxy selected from an unbiased infrared survey of galaxies. The fact that this galaxy shows a flatter energy distribution with more 25 μm emission than other galaxies in the infrared sample may be related to the presence of an intense active nucleus. The radio observations reveal the presence of a nonthermal source that, at 6 cm, shows a prominent double lobed structure 20-30 kpc in size extending beyond the optical confines of the galaxy. The radio source is 3-10 times larger than structures previously seen in spiral galaxies and may represent a transition between the relatively small, weak sources seen in some active spirals and the stronger, larger ones seen toward elliptical galaxies with active nuclei.

Additional Information

© 1985 American Astronomical Society. Received 1984 August 2; accepted 1984 December 14. We would like to thank Drs. R. Ekers, M. Goss, and G. Lake for useful discussions and Carol Oken for assistance in coadding the IRAS data. We would like to thank N. Devereux, G. Hill, and D. dePoy for assistance with the ground-based observations. One of us (C. A. B.) would like to thank Dr. John Bahcall for his hospitality at the Institute for Advanced Study where a draft of this manuscript was prepared. This work was supported in part by NSF grants AST 82-17118 and AST 82-11591.

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Published - 1985ApJ___293__148B.pdf


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