Disc scalelengths out to redshift 5.8

Abstract

We compute the exponential disc scalelength for 686 disc galaxies with spectroscopic redshifts out to redshift 5.8 based on Hubble Space Telescope archival data. We compare the results with our previous measurements based on 30000 nearby galaxies from the Sloan Digital Sky Survey. Our results confirm the presence of a dominating exponential component in galaxies out to this redshift. At the highest redshifts, the disc scalelength for the brightest galaxies with absolute magnitude between -24 and -22 is up to a factor 8 smaller compared to that in the local Universe. This observed scalelength decrease is significantly greater than the value predicted by a cosmological picture in which baryonic disc scalelength scales with the virial radius of the dark matter halo.

5 pages, 4 figures; accepted for publication in MNRAS Letters

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• Non-parametric analysis of the rest-frame UV sizes and morphological disturbance amongst L* galaxies at 4<z<8
• Hiding in plain sight: An abundance of compact massive spheroids in the local Universe
• Exponential Galaxy Disks from Stellar Scattering
• Unveiling the Structure of Barred Galaxies at 3.6 $\mu \mathrm{m}$ with the Spitzer Survey of Stellar Structure in Galaxies (S${}^4$G): I. Disk Breaks
• Shrinking Galaxy Disks with Fountain-Driven Accretion from the Halo
• Exponential profiles from stellar scattering off interstellar clumps and holes in dwarf galaxy discs
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