Bibcode
Trujillo, I.; Beasley, M. A.; Borlaff, Alejandro; Carrasco, Eleazar R.; Di Cintio, A.; Filho, Mercedes; Monelli, M.; Montes, Mireia; Román, J.; Ruiz-Lara, T.; Sánchez Almeida, J.; Valls-Gabaud, David; Vazdekis, A.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 1, p.1192-1219
Advertised on:
6
2019
Citations
124
Refereed citations
108
Description
The claimed detection of a diffuse galaxy lacking dark matter represents
a possible challenge to our understanding of the properties of these
galaxies and galaxy formation in general. The galaxy, already identified
in photographic plates taken in the summer of 1976 at the UK 48-in
Schmidt telescope, presents normal distance-independent properties (e.g.
colour, velocity dispersion of its globular clusters). However,
distance-dependent quantities are at odds with those of other similar
galaxies, namely the luminosity function and sizes of its globular
clusters, mass-to-light ratio, and dark matter content. Here we carry
out a careful analysis of all extant data and show that they
consistently indicate a much shorter distance (13 Mpc) than previously
indicated (20 Mpc). With this revised distance, the galaxy appears to be
a rather ordinary low surface brightness galaxy (Re = 1.4
± 0.1 kpc; M⋆ = 6.0 ± 3.6 ×
107 M⊙) with plenty of room for dark matter
(the fraction of dark matter inside the half-mass radius is >75 per
cent and Mhalo/M⋆>20) corresponding to a
minimum halo mass >109 M⊙. At 13 Mpc, the
luminosity and structural properties of the globular clusters around the
object are the same as those found in other galaxies.
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