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
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10406390" target="_blank" >RIV/00216208:11320/19:10406390 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=O_mv_hQk_0" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=O_mv_hQk_0</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stz1465" target="_blank" >10.1093/mnras/stz1465</a>
Alternative languages
Result language
angličtina
Original language name
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
Original language description
The ultra-diffuse dwarf galaxy NGC 1052-DF2 (DF2) has 10 (11) measured globular clusters (GCs) with a line-of-sight velocity dispersion of sigma = 7.8(-2.2)(+5.2) km s(-1) (sigma = 10.6(-2.3)(+3.9) km s(-1)). Our conventional statistical analysis of the original 10 GCs gives sigma = 8.0(-3.0)(+4.3) km s(-1). The overall distribution of velocities agrees well with a Gaussian of this width. Due to the non-linear Poisson equation in MOND, a dwarf galaxy has weaker self-gravity when in close proximity to a massive host. This external field effect is investigated using a new analytic formulation and fully self-consistent live N-body models in MOND. Our formulation agrees well with that of Famaey and McGaugh. These new simulations confirm our analytic results and suggest that DF2 may be in a deep-freeze state unique to MOND. The correctly calculated MOND velocity dispersion agrees with our inferred dispersion and that of van Dokkum et al. if DF2 is within 150 kpc of NGC 1052 and both are 20 Mpc away. The GCs of DF2 are however significantly brighter and larger than normal GCs, a problem which disappears if DF2 is significantly closer to us. A distance of 10-13 Mpc makes DF2 a normal dwarf galaxy even more consistent with MOND and the 13 Mpc distance reported by Trujillo et al.. We discuss the similar dwarf DF4, finding good agreement with MOND. We also discuss possible massive galaxies near DF2 and DF4 along with their distances and peculiar velocities, noting that NGC 1052 may lie at a distance near 10 Mpc.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
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Volume of the periodical
487
Issue of the periodical within the volume
2
Country of publishing house
GB - UNITED KINGDOM
Number of pages
14
Pages from-to
2441-2454
UT code for WoS article
000474919700068
EID of the result in the Scopus database
2-s2.0-85071133469