NASA/IPAC EXTRAGALACTIC DATABASE
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For refcode 1994MNRAS.267..283A:
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NED Abstract

Copyright by Royal Astronomical Society. 1994MNRAS.267..283A Exponential bulges in late-type spirals: an improved description of the light distribution Y C. Andredakis and R. H. Sanders Kapteyn Astronomical Institute, University of Groningen, PO Box 800,9700 AV Groningen, The Netherlands Foundation for Research and Technology-Helias, PO Box 1527 Heraklion 71110, Crete, Greece Accepted 1993 October 11. Received 1993 October 10; in original form 1993 February 19 ABSTRACT In many cases the modelling of spiral galaxies by an exponential disc and an r1/4-law bulge does not satisfactorily describe the mean radial distribution of light. This is most evident in non-linear least-squares fitting techniques in which the resulting effective radius and surface brightness of the bulge are characterized by large uncertainties and are scattered over large ranges, in sharp contrast to their disc counterparts. We attempt to decompose the major-axis profiles of 34 late- type spirals in terms of an alternative model consisting of an exponential disc and an exponential bulge, using seeing-convolved models. The results of this decomposition show that this model is superior in the statistical aspects of the fitting procedure, in the sense that the various goodness-of-fit indicators are better and the residuals are smaller. The fact that it also confines the parameters of the bulge to a range whose narrowness is comparable to that of the parameters of the disc indicates that this model has the potential to give a better and more consistent description of the bulges of late-type spirals. Key words: galaxies: photometry - galaxies: spiral - galaxies: structure.
Retrieve 34 NED objects in this reference.
Please click here for ADS abstract

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