NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-24 T22:04:56 PDT
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For refcode 2015MNRAS.450.3254P:
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NED Abstract

Copyright by Royal Astronomical Society. 2015MNRAS.450.3254P On the radial abundance gradients in discs of irregular galaxies Pilyugin, L. S.; Grebel, E. K.; Zinchenko, I. A. Abstract. We determine the radial abundance distributions across the discs of 14 irregular galaxies of the types Sm and Im (morphological T types 9 and 10) as traced by their H II regions. The oxygen and nitrogen abundances in H II regions are estimated through the T_e_ method or/and with the counterpart method (C method). Moreover, we examine the correspondence between the radial abundance gradient and the surface brightness profile. We find that irregular galaxies with a flat inner profile (flat or outwardly increasing surface brightness in the central region) show shallow (if any) radial abundance gradients. On the other hand, irregular galaxies with a steep inner profile (with or without a bulge or central star cluster) usually show rather steep radial abundance gradients. This is in contrast to the widely held belief that irregular galaxies do not usually show a radial abundance gradient. Key words: ISM: abundances, H II regions, galaxies: abundances, galaxies: irregular, galaxies: photometry
Retrieve 14 NED objects in this reference.
Please click here for ADS abstract

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