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In an effort to secure, refine and supplement the relation between centralSupermassive Black Hole masses (Mbh), and the bulge luminosities of their hostgalaxies, (Lbul), we obtained deep, high spatial resolution K-band images of 35nearby galaxies with securely measured Mbh, using the wide-field WIRCam imagerat the Canada-France-Hawaii-Telescope (CFHT). A dedicated data reduction andsky subtraction strategy was adopted to estimate the brightness and structureof the sky, a critical step when tracing the light distribution of extendedobjects in the near-infrared. From the final image product, bulge and totalmagnitudes were extracted via two-dimensional profile fitting. As a first orderapproximation, all galaxies were modeled using a simple Sersic-bulge +exponential-disk decomposition. However, we found that such models did notadequately describe the structure that we observe in a large fraction of oursample galaxies which often include cores, bars, nuclei, inner disks, spiralarms, rings and envelopes. In such cases, we adopted profile modificationsand/or more complex models with additional components. The derived bulgemagnitudes are very sensitive to the details and number of components used inthe models, although total magnitudes remain almost unaffected. Usually, butnot always, the luminosities and sizes of the bulges are overestimated when asimple bulge+disk decomposition is adopted in lieu of a more complex model.Furthermore we found that some spheroids are not well fit when the ellipticityof the Sersic model is held fixed. This paper presents the details of the imageprocessing and analysis, while in a companion paper we discuss howmodel-induced biases and systematics in bulge magnitudes impact the Mbh-Lbulrelation.

Supermassive Black Holes and Their Host Galaxies - I. Bulge luminosities from dedicated near-infrared data