A distance of 13 Mpc resolves the claimed anomalies of the galaxy lacking dark matter

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Trujillo, I (Autor) Outra; Beasley, MA (Autor) Outra; Borlaff, A (Autor) Outra; Carrasco, ER (Autor) Outra; Di Cintio, A (Autor) Outra; Mercedes E Filho (Autor) FEUP; Monelli, M (Autor) Outra; Montes, M (Autor) Outra; Roman, J (Autor) Outra; Ruiz Lara, T (Autor) Outra; Almeida, JS (Autor) Outra; Valls Gabaud, D (Autor) Outra; Vazdekis, A (Autor) Outra

Revista

Título: Monthly Notices of the Royal Astronomical Society

Vol. 486

Páginas: 1192-1219

ISSN: 0035-8711

Editora: Oxford University Press

Indexação

ISI Web of Knowledge - 97 Citações

Scopus - 105 Citações

Outras Informações

ID Authenticus: P-00Q-TW0

DOI: 10.1093/mnras/stz771

Abstract (EN): 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 (R-e = 1.4 +/- 0.1 kpc; M-star = 6.0 +/- 3.6 x 10(7) M-circle dot) with plenty of room for dark matter (the fraction of dark matter inside the half-mass radius is >75 per cent and M-halo/M-star > 20) corresponding to a minimum halo mass >10(9) M-circle dot. At 13 Mpc, the luminosity and structural properties of the globular clusters around the object are the same as those found in other galaxies.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 28