Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/43372

Title

The theta-z relation for HST bulges and disks out to z similar or equal to 0.8

Author(s)

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.

Abstract

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

Source

Astrophysical Journal Letters, Vol. 434, no. 2 (Oct 1994), pp. L55-L58

Publication year

1994

Keyword(s)

Cosmology;  Distances;  Evolution;  Galaxies;  Observations;  Photometry;  Radio galaxy;  Redshifts

Publisher

University of Chicago Press

ISSN

0004-637X

Publisher URL

http://www.journals.uchicago.edu/

Peer reviewed