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The MUSE-Faint survey. V. Constraining Scalar Field Dark Matter with Antlia B

Júlio, MP, Brinchmann, J, Zoutendijk, SL, Read, JI, Vaz, D, Kamann, S, Krajnović, D, Boogaard, LA, Steinmetz, M and Bouché, N The MUSE-Faint survey. V. Constraining Scalar Field Dark Matter with Antlia B. Astronomy & Astrophysics. ISSN 0004-6361 (Accepted)

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Aims. We use stellar line-of-sight velocities of Antlia B, a faint dwarf galaxy in the NGC 3109 association, to derive constraints on the fundamental properties of scalar field dark matter originally proposed to solve the small-scale problems faced by cold dark matter models. Methods. We use the first spectroscopic observations of Antlia B, a distant (d ∼ 1.35 Mpc) faint dwarf (MV = −9.7, M⋆ ∼ 8×105M⊙), from MUSE-Faint – a survey of ultra-faint dwarfs with the Multi Unit Spectroscopic Explorer. Through measurement of line-of-sight velocities for stars in the 1′ × 1 ′ field-of-view, we identify 127 stars as members of Antlia B, allowing us to model its dark matter density profile with the Jeans modelling code GravSphere. We implement a model for scalar field dark matter into GravSphere and use this to place constraints on the self-coupling strength of this model. Results. We find a virial mass of M200 ≈ 1.66+2.51 −0.92 × 109 M⊙ and a concentration parameter of c200 ≈ 17.38+6.06 −4.20 for Antlia B. These results are consistent with the mass-concentration relations in the literature. We constrain the characteristic length scale of the repulsive self-interaction RTF of the scalar field dark matter model to RTF ≲ 180 pc (68% confidence level), which translates to a self-coupling strength of g m2c 4 ≲ 5.2×10−20 eV−1 cm3 . The constraint on the characteristic length scale of the repulsive self-interaction is inconsistent with the value required to match the observations of cores of dwarf galaxies in the Local Group, suggesting that the cored density profiles of those galaxies are not caused by scalar field dark matter.

Item Type: Article
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA; astro-ph.CO
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Related URLs:
SWORD Depositor: A Symplectic
Date Deposited: 31 Jul 2023 09:22
Last Modified: 15 Aug 2023 09:27
URI: https://researchonline.ljmu.ac.uk/id/eprint/20557

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