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Recent observations of distant disk galaxies show that there is little to noevolution in the relation between maximum rotation speed and stellar mass at z< 1.2. There is however a significant scatter between these two quantitieswhose origin is uncertain. We show in this paper that this scatter is at leastpartially the result of galaxy merging, revealing that disk galaxy growth at z< 1 is fundamentally hierarchical. We carry this out by calculating CAS(concentration, asymmetry, clumpiness) structural parameters using archivalHubble Space Telescope imaging of 91 high-redshift disk galaxies at 0.4 < z <1.0 with robustly measured stellar masses and rotational maximum velocitiestaken from Conselice et al. (2005). We separate our sample into two redshiftbins divided at z = 0.7, and investigate deviations from the stellar-massTully-Fisher relation in both the M_* and V_max directions, and how thesecorrelate with structural asymmetries. We find a significant (> 3 sigma)correlation between the residuals from the stellar-mass Tully-Fisher relationin both the M_* and V_max directions, and high asymmetries. This result holdsafter we remove contributions from star formation and edge-on galaxies whichcan produce higher asymmetries unrelated to merging. While there are a fewcases in which our disk galaxies have very large asymmetries, and arepotentially involved in major mergers, in general these asymmetries are smallerthan the major merger limit. It is therefore likely that these galaxies areforming hierarchically through minor galaxy mergers, which is also suggested bythe constant slope and zero point of the stellar mass Tully-Fisher relationduring the same epoch.

Hierarchical Disk Galaxy Assembly as the Origin of Scatter in the z~1 Stellar Mass Tully-Fisher Relation