The dynamics of the bulge dominated galaxy NGC 7814 in MOND

Journal article


Authors / Editors


Research Areas

No matching items found.


Publication Details

Author list: Angus GW, van der Heyden KJ, Diaferio A

Publisher: EDP Sciences

Place: LES ULIS CEDEX A

Publication year: 2012

Journal: Astronomy & Astrophysics (0004-6361)

Journal acronym: ASTRON ASTROPHYS

Volume number: 543

Number of pages: 5

ISSN: 0004-6361

eISSN: 1432-0746

Languages: English-Great Britain (EN-GB)


View in Web of Science | View on publisher site | View citing articles in Web of Science


Abstract

Context. The bulge dominated galaxy NGC 7814 provides one of the strongest dynamical tests possible for MOdified Newtonian Dynamics (MOND). Spitzer 3.6 mu m photometry fixes the bulge parameterisation and strongly constrains the properties of the subdominant stellar disk. Furthermore, the distance is known to better than 5%, virtually eliminating it as a free parameter. The rotation curve is easily measured, since the H I (and stellar) disks are edge on, and both the receding and approaching sides agree very well.Aims. We explore the agreement between the model and observed rotation curves in MOND given that the only two free parameters available are the mass-to-light ratios of the bulge and disk.Methods. We use a grid based MOND Poisson solver that accurately solves for the MOND gravity and produces our model rotation curves from a given mass distribtion. The input to the Poisson solver is a 3D distribution of N particles which is generated from modelling the observed distribution of stars and gas in the galaxy.Results. By ensuring a superior fit to the radial surface brightness profile than previous works, by virtue of a double Sersic fit to the bulge, we were able to produce excellent fits to the rotation curve with typical values for both mass-to-light ratios.Conclusions. The model rotation curve of a mass distribution in MOND is extremely sensitive to the bulge-disk decomposition and even slight deviation from the observed mass distribution can produce large differences in the model rotation curve.


Keywords

Dark matter, galaxies: elliptical and lenticular, cD, galaxies: kinematics and dynamics, methods: numerical


Documents

No matching items found.


Last updated on 2023-31-07 at 00:42