Triaxiality can Explain the Alleged Dark Matter Deficiency in some Dwarf Galaxies

Sánchez Almeida, J.; Filho, M.
Bibliographical reference

Research Notes of the American Astronomical Society

Advertised on:
12
2019
Number of authors
2
IAC number of authors
1
Citations
4
Refereed citations
4
Description
Dark Matter (DM) is an ingredient essential to the current cosmological concordance model. It provides the gravitational pull needed for the baryons to form galaxies. Therefore, the existence of galaxies without DM is both disquieting and extremely interesting. Guo et al. recently presented "further evidence for a population of DM-deficient dwarf galaxies", however, their analysis bypasses the triaxiality of the dwarf galaxies. We carry out a Monte Carlo simulation showing how triaxiality must be considered to measure dynamical masses from projected axial ratios, calling into question the evidence for a population of DM-deficient dwarf galaxies. Such a population may consist of normal almost face-on HI disks with their inclination overestimated.