NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-17 T23:33:38 PDT
Help | Comment | NED Home

For refcode 2017ApJ...836..152L:
Retrieve 86 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2017ApJ...836..152L One Law to Rule Them All: The Radial Acceleration Relation of Galaxies Lelli, Federico; McGaugh, Stacy S.; Schombert, James M.; Pawlowski, Marcel S. Abstract. We study the link between baryons and dark matter (DM) in 240 galaxies with spatially resolved kinematic data. Our sample spans 9 dex in stellar mass and includes all morphological types. We consider (1) 153 late-type galaxies (LTGs; spirals and irregulars) with gas rotation curves from the SPARC database, (2) 25 early-type galaxies (ETGs; ellipticals and lenticulars) with stellar and H I data from ATLAS{}^3{{D^}} or X-ray data from Chandra, and (3) 62 dwarf spheroidals (dSphs) with individual-star spectroscopy. We find that LTGs, ETGs, and "classical" dSphs follow the same radial acceleration relation: the observed acceleration ({g}_{obs_}) correlates with that expected from the distribution of baryons ({g}_{bar_}) over 4 dex. The relation coincides with the 1:1 line (no DM) at high accelerations but systematically deviates from unity below a critical scale of ~10^-10^ m s^-2^. The observed scatter is remarkably small (<~ 0.13 dex) and largely driven by observational uncertainties. The residuals do not correlate with any global or local galaxy property (e.g., baryonic mass, gas fraction, and radius). The radial acceleration relation is tantamount to a natural law: when the baryonic contribution is measured, the rotation curve follows, and vice versa. Including ultrafaint dSphs, the relation may extend by another 2 dex and possibly flatten at {g}_{bar_}<~ {10}^-12^ m s^-2^, but these data are significantly more uncertain. The radial acceleration relation subsumes and generalizes several well-known dynamical properties of galaxies, like the Tully--Fisher and Faber--Jackson relations, the "baryon-halo" conspiracies, and Renzo's rule. Key words: dark matter, galaxies: dwarf, galaxies: elliptical and lenticular, cD, galaxies: irregular, galaxies: kinematics and dynamics, galaxies: spiral
Retrieve 86 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home