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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/43372
- The theta-z relation for HST bulges and disks out to z similar or equal to 0.8
- Mutz, Steven B.; Windhorst, Rogier A.; Schmidtke, Paul C.; Pascarelle, Sebastian M.; Griffiths, Richard E.; Ratnatunga, Kavan U.; Casertano, Stefano; Im, Myungshin; Ellis, Richard S.; Glazebrook, Karl; Green, Richard F.; Sarajedini, Vicki L.
- We present HST scale lengths and ground-based redshifts for 63 faint field galaxies down to 1 ≲ 21.5 mag from the Medium-Deep Survey. These have measured redshifts z ≲ 0.8 and half-light radii 0″.1 ≲ re, rs ≲ 5″. We present the Θ-z relation for r1/4-bulges and exponential disks separately for world models with q0 = 0.0-1.0. We show that selection against low surface brightness galaxies in the HST images and ground-based spectra is comparable to that in local surveys. We compare our HST disk-dominated galaxies to a magnitude-limited subsample of the ESO-Uppsala local spirals. Extrapolating the best-fit local exponential disk scale length (rs = 3.5 kpc for H0 = 75) out to z = 0.8, we find a rather symmetrical distribution of HST disks around this value. This implies that galaxy disks have been stable since z ≃ 0.8. We compare our HST bulge-dominated galaxies with r1/4-profiles to a magnitude-limited subsample of local Seven Samurai ellipticals. The latter have a local best fit re = 5.7 kpc. Our HST bulge sample shows a similar distribution for z ≲ 0.8. Elliptical galaxy scale lengths have thus also remained rather constant since z ≲ 0.8. We set limits to their possible evolution.
- Publication type
- Journal article
- Astrophysical Journal Letters, Vol. 434, no. 2 (Oct 1994), pp. L55-L58
- Publication year
- Cosmology; Distances; Evolution; Galaxies; Observations; Photometry; Radio galaxy; Redshifts
- University of Chicago Press
- Publisher URL
- Peer reviewed