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

Modified Newtonian dynamics (MOND) provides a paradigm alternative to darkmatter that has been successful in fitting and predicting the richphenomenology of rotating disc galaxies. There have also been attempts to testMOND in dispersion-supported early-type galaxies, but it remains unclearwhether MOND can fit the various empirical properties of early-type galaxies.As a way of rigorously testing MOND in elliptical galaxies we calculate theMOND-predicted velocity dispersion profiles (VDPs) in the inner regions of$\sim 2000$ nearly round SDSS elliptical galaxies under a variety ofassumptions on VD anisotropy, and then compare the predicted distribution ofVDP slopes with the observed distribution in 11 ATLAS3d galaxies selected withessentially the same criteria. We find that the MOND model parameterised withan interpolating function that works well for rotating galaxies can alsoreproduce the observed distribution of VDP slopes based only on the observedstellar mass distribution without DM or any other galaxy-to-galaxy varyingfactor. This is remarkable in view that Newtonian dynamics with DM requires aspecific amount and/or profile of DM for each galaxy in order to reproduce theobserved distribution of VDP slopes. When we analyse non-round galaxy samplesusing the MOND-based spherical Jeans equation, we do not find any systematicdifference in the mean property of the VDP slope distribution compared with thenearly round sample. However, in line with previous studies of MOND throughindividual analyses of elliptical galaxies, varying MOND interpolating functionor VD anisotropy can lead to systematic change in the VDP slope distribution,indicating that a statistical analysis of VDPs can be used to constrainspecific MOND models with an accurate measurement of VDP slopes or a priorconstraint on VD anisotropy.

Testing Modified Newtonian dynamics through statistics of velocity dispersion profiles in the inner regions of elliptical galaxies