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A panchromatic investigation of morphology for the early-type spiral galaxyM81 is presented in this paper. We perform bulge-disk decomposition in M81images at a total of 20 wavebands from FUV to NIR obtained with GALEX, Swift,SDSS, WIYN, 2MASS, WISE, and Spitzer. Morphological parameters such as Sersicindex, effective radius, position angle, and axis ratio for the bulge and thedisk are thus derived at all of the wavebands, which enables quantifying themorphological K-correction for M81 and makes it possible to reproduce imagesfor the bulge and the disk in the galaxy at any waveband. The morphology as afunction of wavelength appears as a variable-slope trend of the Sersic indexand the effective radius, in which the variations are steep at UV--optical andshallow at optical--NIR bands; the position angle and the axis ratio keepinvariable at least at optical--NIR bands. It is worth noting that the Sersicindex for the bulge reaches about 4--5 at optical and NIR bands, but drops toabout 1 at UV bands. This difference brings forward a caveat that a classicalbulge is likely misidentified for a pseudo-bulge or no bulge at high redshiftswhere galaxies are observed through rest-frame UV channels with opticaltelescopes. The next work of this series is planned to study spatially resolvedSEDs for the bulge and the disk, respectively, and thereby explore stellarpopulation properties and star formation/quenching history for the the galaxycomposed of the subsystems.

Multiwavelength Bulge-Disk Decomposition for the Galaxy M81 (NGC 3031). I. Morphology