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Date and Time of the Query: 2019-05-25 T22:27:47 PDT
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For refcode 2018MNRAS.475.1447B:
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Copyright by Royal Astronomical Society. 2018MNRAS.475.1447B Rotation curves of high-resolution LSB and SPARC galaxies with fuzzy and multistate (ultralight boson) scalar field dark matter Bernal, T.; Fernandez-Hernandez, L. M.; Matos, T.; Rodriguez-Meza, M. A. Abstract. Cold dark matter (CDM) has shown to be an excellent candidate for the dark matter (DM) of the Universe at large scales; however, it presents some challenges at the galactic level. The scalar field dark matter (SFDM), also called fuzzy, wave, Bose-Einstein condensate, or ultralight axion DM, is identical to CDM at cosmological scales but different at the galactic ones. SFDM forms core haloes, it has a natural cut-off in its matter power spectrum, and it predicts well-formed galaxies at high redshifts. In this work we reproduce the rotation curves of high-resolution low surface brightness (LSB) and SPARC galaxies with two SFDM profiles: (1) the soliton+NFW profile in the fuzzy DM (FDM) model, arising empirically from cosmological simulations of real, non-interacting scalar field (SF) at zero temperature, and (2) the multistate SFDM (mSFDM) profile, an exact solution to the Einstein-Klein-Gordon equations for a real, self-interacting SF, with finite temperature into the SF potential, introducing several quantum states as a realistic model for an SFDM halo. From the fits with the soliton+NFW profile, we obtained for the boson mass 0.212 < m_psi_/(10^-23^ eV/c^2^) < 27.0 and for the core radius 0.326 < r_c_/kpc < 8.96. From the combined analysis with the LSB galaxies, we obtained m_psi_ = 0.554 x 10^-23^ eV, a result in tension with the severe cosmological constraints. Also, we show the analytical mSFDM model fits the observations as well as or better than the empirical soliton+NFW profile, and it reproduces naturally the wiggles present in some galaxies, being a theoretically motivated framework additional or alternative to the FDM profile. Key words: galaxies: haloes, galaxies: structure, dark matter
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