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- W3135101178 endingPage "A124" @default.
- W3135101178 startingPage "A124" @default.
- W3135101178 abstract "Elliptical (E) and spiral (S) galaxies follow tight, but different, scaling laws that link their stellar masses, radii, and characteristic velocities. Mass and velocity, for example, scale tightly in spirals with little dependence on galaxy radius (the Tully-Fisher relation; TFR). On the other hand, ellipticals appear to trace a 2D surface in size-mass-velocity space (the Fundamental Plane; FP). Over the years, a number of studies have attempted to understand these empirical relations, usually in terms of variations of the virial theorem for E galaxies and in terms of the scaling relations of dark matter halos for spirals. We use Lambda cold dark matter (LCDM) cosmological hydrodynamical simulations to show that the scaling relations of both ellipticals and spirals arise as the result of (i) a tight galaxy mass-dark halo mass relation and (ii) the self-similar mass profile of cold dark matter halos. In this interpretation, E and S galaxies of a given stellar mass inhabit halos of similar masses, and their different scaling laws result from the varying amounts of dark matter enclosed within their luminous radii. This scenario suggests a new galaxy distance indicator applicable to galaxies of all morphologies and provides simple and intuitive explanations for long-standing puzzles, such as why the TFR is independent of surface brightness, or what causes the tilt in the FP. Our results provide strong support for the predictions of LCDM in the strongly non-linear regime, as well as guidance for further improvements to cosmological simulations of galaxy formation." @default.
- W3135101178 created "2021-03-15" @default.
- W3135101178 creator A5006211755 @default.
- W3135101178 creator A5006250078 @default.
- W3135101178 creator A5011784347 @default.
- W3135101178 creator A5051216014 @default.
- W3135101178 creator A5059027620 @default.
- W3135101178 date "2021-04-01" @default.
- W3135101178 modified "2023-10-16" @default.
- W3135101178 title "A unified scenario for the origin of spiral and elliptical galaxy structural scaling laws" @default.
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