The Theta-z relation for HST bulges and disks out to Z approximately equal 0.8

Details The Theta-z relation for HST bulges and disks out to Z approximately equal 0.8 The Theta-z relation for HST bulges and disks out to Z approximately equal 0.8

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434l..55m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 434, no. 2, p. L55-L58

Astronomy and Astrophysics

Astronomy

42

Astronomical Models, Disk Galaxies, Galactic Bulge, Galactic Evolution, Red Shift, Hubble Space Telescope, Luminous Intensity, Maximum Likelihood Estimates, Point Spread Functions, Sky Surveys (Astronomy)

Scientific paper

We present Hubble Space Telescope (HST) scale lengths and ground-based redshifts for 63 faint field galaxies down to I less than or approximately 21.5 mag from the Medium-Deep Survey. These have measured redshifts z less than or approximately 0.8 and half-light radii 0.1 sec less than or approximately re, rs less than or approximately 5 sec. We present the Theta-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 European Southern Observatory (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 is approximately equal to 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 less than or approximately 0.8. Elliptical galaxy scale lengths have thus also remained rather constant since z less than or approximately 0.8. We set limits to their possible evolution.

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