Matches in SemOpenAlex for { <https://semopenalex.org/work/W1978642495> ?p ?o ?g. }
- W1978642495 endingPage "52" @default.
- W1978642495 startingPage "27" @default.
- W1978642495 abstract "We use observed rotation velocity-luminosity (VL) and size-luminosity (RL) relations to single out a specific scenario for disk galaxy formation in the ΛCDM cosmology. Our model involves four independent lognormal random variables: dark halo concentration c, disk spin λgal, disk mass fraction mgal, and stellar mass-to-light ratio ϒI. A simultaneous match of the VL and RL zero points with adiabatic contraction requires low-c halos, but this model has V2.2 ~ 1.8Vvir (where V2.2 and Vvir are the circular velocity at 2.2 disk scale lengths and the virial radius, respectively), which will be unable to match the luminosity function (LF). Similarly models without adiabatic contraction but standard c also predict high values of V2.2/Vvir. Models in which disk formation induces an expansion rather than the commonly assumed contraction of the dark matter halos have V2.2 ~ 1.2Vvir, which allows a simultaneous fit of the LF. This may result from nonspherical, clumpy gas accretion, where dynamical friction transfers energy from the gas to the dark matter. This model requires low λgal and mgal values, contrary to naive expectations. However, the low λgal is consistent with the notion that disk galaxies predominantly survive in halos with a quiet merger history, while a low mgal is also indicated by galaxy-galaxy lensing. The smaller than expected scatter in the RL relation and the lack of correlation between the residuals of the VL and RL relations, respectively, imply that the scatter in λgal and in c needs to be smaller than predicted for ΛCDM halos, again consistent with the idea that disk galaxies preferentially reside in halos with a quiet merger history." @default.
- W1978642495 created "2016-06-24" @default.
- W1978642495 creator A5014952030 @default.
- W1978642495 creator A5017176794 @default.
- W1978642495 creator A5034120384 @default.
- W1978642495 creator A5071076653 @default.
- W1978642495 date "2007-01-01" @default.
- W1978642495 modified "2023-09-27" @default.
- W1978642495 title "A Revised Model for the Formation of Disk Galaxies: Low Spin and Dark Halo Expansion" @default.
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