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Using the HST WFPC2/NICMOS archival data of the Hubble Deep Field North, weconstruct the nearly complete sample of the Mv <-20 (~L*+1) galaxies to z=2,and investigate when the Hubble sequence appeared, namely, the evolution of themorphology, colors, and the comoving number density of the sample. Even iftaking into account of the uncertainty of the photometric redshift technique,the number density of relatively bright bulge-dominated galaxies in the HDF-Ndecrease significantly at z>1, and their rest-frame U-V color distribution iswide-spread over 0.5<z<2. On the other hand, while the number density of bothdisk-dominated and irregular galaxies does not show significant change at z<2,their distribution of the rest-frame U-V color alters at z~1.5: there is norelatively red (rest U-V>0.3) galaxies at z>1.5, while the significant fractionof these red disk-dominated or irregular galaxies exists at z<1.5. Theseresults suggest that the significant evolution of the Hubble sequence which isseen in the present Universe occurs at 1<z<2.Comment: 40 pages, 25 figures, submitted for publication in PAS

When Did the Hubble Sequence Appear?: Morphology, Color, and Number-Density Evolution of the Galaxies in the Hubble Deep Field North