Skip to content

Research at St Andrews

Evolution of globular-cluster systems of ultra-diffuse galaxies due to dynamical friction in MOND gravity

Research output: Contribution to journalArticlepeer-review

Open Access permissions

Open

Author(s)

Michal Bílek, Hongsheng Zhao, Benoit Famaey, Oliver Müller, Pavel Kroupa, Rodrigo Ibata

School/Research organisations

Abstract

Context. Dynamical friction can be used to distinguish Newtonian gravity and modified Newtonian dynamics (MOND) because it works differently in these frameworks. This concept, however, has yet to be explored very much with MOND. Previous simulations showed weaker dynamical friction during major mergers for MOND than for Newtonian gravity with dark matter. Analytic arguments suggest the opposite for minor mergers. In this work, we verify the analytic predictions for MOND by high-resolution N-body simulations of globular clusters (GCs) moving in isolated ultra-diffuse galaxies (UDGs).

Aims. We test the MOND analog of the Chandrasekhar formula for the dynamical friction proposed by Sánchez-Salcedo on a single GC. We also explore whether MOND allows GC systems of isolated UDGs to survive without sinking into nuclear star clusters.

Methods. The simulations are run using the adaptive-mesh-refinement code Phantom of Ramses. The mass resolution is 20 M⊙ and the spatial resolution 50 pc. The GCs are modeled as point masses.

Results. Simulations including a single GC reveal that, as long as the apocenter of the GC is over about 0.5 effective radii, the Sánchez-Salcedo formula works excellently, with an effective Coulomb logarithm increasing with orbital circularity. Once the GC reaches the central kiloparsec, its sinking virtually stops, likely because of the core stalling mechanism. In simulations with multiple GCs, many of them sink toward the center, but the core stalling effect seems to prevent them from forming a nuclear star cluster. The GC system ends up with a lower velocity dispersion than the stars of the galaxy. By scaling the simulations, we extend these results to most UDG parameters, as long as these UDGs are not external-field dominated. We verify analytically that approximating the GCs by point masses has little effect if the GCs have the usual properties, but for massive GCs such as those observed in the NGC 1052-DF2 galaxy, further simulations with resolved GCs are desirable.
Close

Details

Original languageEnglish
Article numberA170
Number of pages17
JournalAstronomy & Astrophysics
Volume653
Early online date29 Sep 2021
DOIs
Publication statusPublished - Sep 2021

    Research areas

  • Galaxies: structure, Galaxies: star clusters: general, Galaxies: kinematics and dynamics, Galaxies: dwarf, Galaxies: evolution, Gravitation

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. New test on the Einstein equivalence principle through the photon ring of black holes

    Li, C., Zhao, H. & Cai, Y. F., 15 Sep 2021, In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 104, 6, 16 p., 064027 .

    Research output: Contribution to journalArticlepeer-review

  2. Stellar streams in chameleon gravity

    Naik, A. P., Evans, N. W., Puchwein, E., Zhao, H. & Davis, A-C., 27 Oct 2020, In: Physical review. D, Particles, fields, gravitation, and cosmology. 102, 8, 24 p., 084066 .

    Research output: Contribution to journalArticlepeer-review

  3. Testing the equivalence principle via the shadow of black holes

    Li, C., Yan, S-F., Xue, L., Ren, X., Cai, Y-F., Easson, D. A., Yuan, Y-F. & Zhao, H., Jul 2020, In: Physical Review Research. 2, 2, 11 p., 023164 .

    Research output: Contribution to journalArticlepeer-review

  4. A new formulation of the external field effect in MOND and numerical simulations of ultra-diffuse dwarf galaxies - application to NGC 1052-DF2 and NGC 1052-DF4

    Haghi, H., Kroupa, P., Banik, I., Wu, X., Zonoozi, A. H., Javanmardi, B., Ghari, A., Mueller, O., Dabringhausen, J. & Zhao, H., Aug 2019, In: Monthly Notices of the Royal Astronomical Society. 487, 2, p. 2441-2454 14 p.

    Research output: Contribution to journalArticlepeer-review

  5. Erratum: Testing gravity with wide binary stars like α Centauri

    Banik, I. & Zhao, H., Apr 2019, In: Monthly Notices of the Royal Astronomical Society. 484, 2, p. 1589-1589 1 p.

    Research output: Contribution to journalArticlepeer-review

Related by journal

  1. A fast multi-dimensional magnetohydrodynamic formulation of the transition region adaptive conduction (TRAC) method

    Johnston, C. D., Hood, A. W., De Moortel, I., Pagano, P. & Howson, T. A., Oct 2021, In: Astronomy & Astrophysics. 654, 16 p., A2.

    Research output: Contribution to journalArticlepeer-review

  2. Dust in brown dwarfs and extra-solar planets: VIII. TiO2 seed formation: 3D Monte Carlo versus kinetic approach

    Kohn, C., Helling, C., Enghoff, M. B., Haynes, K., Sindel, JP., Krog, D. & Gobrecht, D., Oct 2021, In: Astronomy & Astrophysics. 654, 16 p., A120.

    Research output: Contribution to journalArticlepeer-review

  3. The HARPS search for southern extra-solar planets: XLVI. 12 super-Earths around the solar type stars HD 39194, HD 93385, HD 96700, HD 154088, and HD 189567

    Unger, N., Segransan, D., Queloz, D., Udry, S., Lovis, C., Mordasini, C., Ahrer, E., Benz, W., Bouchy, F., Delisle, JB., Diaz, RF., Dumusque, X., Lo Curto, G., Marmier, M., Mayor, M., Pepe, F., Santos, NC., Stalport, M., Alonso, R., Cameron, AC. & 6 others, Deleuil, M., Figueira, P., Gillon, M., Moutou, C., Pollacco, D. & Pompei, E., Oct 2021, In: Astronomy & Astrophysics. 654, 19 p., A104.

    Research output: Contribution to journalArticlepeer-review

  4. The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS

    Szabo, G. M., Gandolfi, D., Brandeker, A., Csizmadia, S., Garai, Z., Billot, N., Broeg, C., Ehrenreich, D., Fortier, A., Fossati, L., Hoyer, S., Kiss, L., Lecavelier des Etangs, A., Maxted, PFL., Ribas, I., Alibert, Y., Alonso, R., Escude, GA., Barczy, T., Barros, SCC. & 61 others, Barrado, D., Baumjohann, W., Beck, M., Beck, T., Bekkelien, A., Bonfils, X., Benz, W., Borsato, L., Busch, MD., Cabrera, J., Charnoz, S., Cameron, AC., Van Damme, CC., Davies, MB., Delrez, L., Deleuil, M., Demangeon, ODS., Demory, BO., Erikson, A., Fridlund, M., Futyan, D., Muñoz, A. G., Gillon, M., Guedel, M., Guterman, P., Heng, K., Isaak, KG., Lacedelli, G., Laskar, J., Lendl, M., Lovis, C., Luntzer, A., Magrin, D., Nascimbeni, V., Olofsson, G., Osborn, HP., Ottensamer, R., Pagano, I., Palle, E., Peter, G., Piazza, D., Piotto, G., Pollacco, D., Queloz, D., Ragazzoni, R., Rando, N., Rauer, H., Santos, NC., Scandariato, G., Segransan, D., Serrano, LM., Sicilia, D., Simon, AE., Smith, AMS., Sousa, SG., Steller, M., Thomas, N., Udry, S., Van Grootel, V., Walton, NA. & Wilson, TG., Oct 2021, In: Astronomy & Astrophysics. 654, 15 p., A159.

    Research output: Contribution to journalArticlepeer-review

  5. Magnetic reconnection and the Kelvin-Helmholtz instability in the solar corona

    Howson, T. A., De Moortel, I. & Pontin, D., 24 Sep 2021, (Accepted/In press) In: Astronomy & Astrophysics.

    Research output: Contribution to journalArticlepeer-review

Related by journal

  1. Astronomy & Astrophysics (Journal)

    Duncan Hendry Mackay (Editor)

    2004 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

  2. Astronomy & Astrophysics (Journal)

    Christiane Helling (Editor)

    2000 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

  3. Astronomy & Astrophysics (Journal)

    Alan William Hood (Editor)

    1980 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

ID: 276153752

Top