2021A&A...656A.123E


Query : 2021A&A...656A.123E

2021A&A...656A.123E - Astronomy and Astrophysics, volume 656A, 123-123 (2021/12-1)

A cusp-core-like challenge for modified Newtonian dynamics.

ERIKSEN M.H., FRANDSEN M.T. and FROM M.H.

Abstract (from CDS):

We show that modified Newtonian dynamics (MOND) predicts distinct galactic acceleration curve geometries - in the space of total observed centripetal accelerations, gtot, versus the inferred Newtonian acceleration from baryonic matter, gN, which we refer to as g2 space - and corresponding rotation speed curves. MOND modified gravity predicts cored geometries for isolated galaxies, while MOND modified inertia yields neutral geometries (i.e. neither cuspy nor cored), based on a cusp-core classification of galaxy rotation curve geometry in g2 space, rather than on inferred dark matter (DM) density profiles. The classification can be applied both to DM and modified gravity models as well as data and implies a 'cusp-core' challenge for MOND from observations (e.g., of cuspy galaxies), which is different from the so-called cusp-core problem of DM. We illustrate this challenge with a number of cuspy and cored galaxies from the SPARC rotation curve database that deviate significantly from the MOND modified gravity and MOND modified inertia predictions.

Abstract Copyright: © ESO 2021

Journal keyword(s): dark matter - methods: data analysis - Galaxy: structure

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 UGC 3580 G 06 55 30.9694563864 +69 33 47.319499836   13.01 12.57 12.08 11.50 ~ 90 1
2 UGC 4115 G 07 57 01.027 +14 23 47.66   16.0       ~ 143 0
3 NGC 4217 GiG 12 15 50.900 +47 05 30.44   12.4       ~ 281 2
4 IC 4202 EmG 13 08 31.5891545640 +24 42 02.857607676   15.2       ~ 94 0
5 NGC 5023 EmG 13 12 11.8036148808 +44 02 17.328663600   13.2       ~ 240 0
6 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 738 1
7 UGC 12506 G 23 19 30.4940411496 +16 04 29.240723064   15.6       ~ 66 0

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2023.01.30-21:21:19

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