Abstract
In this study we present photometric results for the galaxy NGC 4736: infrared and visible profiles. After a careful correction for the extinction within the galaxy based on measured neutral gas surface densities, we interpret the profiles in the individual bands and in colour indices, in terms of the radial distribution of stellar populations. We pick out the behaviour of the two rings, an inner ring some 40–50 arc sec from the nucleus, and an outer ring some 300 arc sec away. We show how the photometry allows us to make tentative physical inferences about the nature of these two structures, showing that the inner ring is connected with an outflow of gas observed via itsHii regions, and is probably the result of an axisymmetric starburst, while the outer ring is a site of star formation which appears to be further from the centre than the typical resonant structures associated with a density wave.
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Muñoz-Tuñon, C., Prieto, M., Beckman, J. et al. A photometric study of the double ring structure of NGC 4736. Astrophys Space Sci 156, 301–313 (1989). https://doi.org/10.1007/BF00646382
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DOI: https://doi.org/10.1007/BF00646382