English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The variation of the mass-to-light ratios M/L of early type galaxies asfunction of their luminosities L is investigated. It is shown that the tiltbeta=0.27 (in the B--band) of the fundamental plane relation M/L ~ L^{beta} canbe understood as a combination of two effects: about one-quarter (i.e. dbeta=0.07) is a result of systematic variations of the stellar populationproperties with increasing luminosity. The remaining three-quarters (i.e. dbeta=0.2) can be completely attributed to nonhomology effects that lead to asystematic change of the surface brightness profiles with increasingluminosity. Consequently, the observed tilt in the K-band (beta=0.17) wherestellar population effects are negligible, is explained by nonhomology effectsalone. After correcting for nonhomology, the mean value of the mass-to-lightratio of elliptical galaxies (M/L_B) is 7.1+-2.8 (1 sigma scatter).Comment: 8 pages, 3 figures, ApJL, 600, 39, minor changes made to match the  published versio

The Tilt of the Fundamental Plane: Three-Quarters Structural Nonhomology, One-Quarter Stellar Population