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We aim to define a sample of intermediate-z disk galaxies harbouring centralbulges, and a complementary sample of disk galaxies without measurable bulges.We intend to provide colour profiles for both samples, as well as measurementsof nuclear, disk, and global colours, which may be used to constrain therelative ages of bulges and disks. We select a diameter-limited sample ofgalaxies in images from the HST/WFPC2 Groth Strip survey, which is divided intotwo subsamples of higher and lower inclination to assess the role of dust inthe measures quantities. Mergers are visually identified and excluded. We takespecial care to control the pollution by ellipticals. The bulge sample isdefined with a criterion based on nuclear surface brightness excess over theinward extrapolation of the exponential law fitted to the outer regions of thegalaxies. We extract colour profiles on the semi-minor axis least affected bydust in the disk, and measure nuclear colours at 0.85 kpc from the centre overthose profiles. Disk colours are measured on major axis profiles; globalcolours are obtained from 2.6"-diameter apertures. We obtain a parent samplecontaining 248 galaxies with known redshifts, spectroscopic or photometric,spanning 0.1 < z < 1.2. The bulge subsample comprises 54 galaxies (21.8% of thetotal), while the subsample with no measureable bulges is 55.2% of the total(137 galaxies). The remainder (23%) is composed of mergers. We list nuclear,disk, and global colours (observed and restframe) and magnitudes (apparent andabsolute), as well as galaxy colour gradients for the samples with and withoutbulges. We also provide images, colour maps, plots of spectral energydistributions, major-axis surface brightness profiles, and minor-axis colourprofiles for both samples.

Bulges of disk galaxies at intermediate redshifts. I. Samples with and without bulges in the Groth Strip Survey