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For refcode 1998MNRAS.299..672S:
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Copyright by Royal Astronomical Society. 1998MNRAS.299..672S The structure of spiral galaxies - I. Near-infrared properties of bulges, discs and bars M. S. Seigar and P. A. James Accepted 1998 April 21. Received 1998 April 19; in original form 1997 August 22 ABSTRACT We present data for a sample of 45 spiral galaxies over a range of Hubble types, imaged in the near-IR J and K bands. Parameters are calculated describing the bulge, disc and barK-band light distributions, and we look for correlations showing the interrelation between these components. We find that bulge profiles are not well-fitted by the classic de Vaucouleurs profile, and that exponential or R^1/2^ fits are preferred. The bulge-to-disc ratio correlates only weakly with Hubble type. Many of the galaxies show central reddening of their J - K colours, which we interpret as due to nuclear starbursts or dusty AGN. We define a new method for measuring the strength of bars, which we call `equivalent angle'. We stress that this is better than the traditional bar- interbar contrast, as it is not subject to seeing and resolution effects. Bars are found in 40 of the 45 galaxies, nine of which had been previously classified as unbarred. Bar strengths are found not to correlate with disc surface brightness or the presence of near neighbours, but a tendency is found for the most strongly barred galaxies to lie within a restricted, intermediate range of bulge-to-disc ratio. Bar light profiles are found to be either flat or exponentially decreasing along their long axes, with profile type not correlating strongly with Hubble type. Bar short axis profiles are significantly asymmetric, with the steeper profile being generally on the leading edge, assuming trailing arms. In the K band we find bars with higher axial ratios than have been found previously in optical studies. Key words: galaxies: fundamental parameters - galaxies: spiral - galaxies: structure - infrared: galaxies.
Retrieve 45 NED objects in this reference.
Please click here for ADS abstract

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