The MUSE-Faint survey: I. Spectroscopic evidence for a star cluster in Eridanus 2 and constraints on MACHOs as a constituent of dark matter
| Autor: | Mark den Brok, Stefan Dreizler, Tim-Oliver Husser, Leindert Boogaard, Martin Roth, Sebastian Kamann, Jarle Brinchmann, Sebastiaan L. Zoutendijk, Andrés Felipe Ramos Padilla, M. L. P. Gunawardhana, Davor Krajnović, Roland Bacon |
|---|---|
| Přispěvatelé: | Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), MUSE, École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
galaxies: star clusters: individual: Eridanus 2 cluster
Dark matter Population FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences dark matter 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Eridanus 010306 general physics education 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Dwarf galaxy Physics Very Large Telescope education.field_of_study galaxies: individual: Eridanus 2 Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Carbon star Stars Star cluster 13. Climate action Space and Planetary Science techniques: imaging spectroscopy Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, 2020, 635, pp.A107. ⟨10.1051/0004-6361/201936155⟩ Astronomy & Astrophysics, 635, A107 Astron.Astrophys. Astron.Astrophys., 2020, 635, pp.A107. ⟨10.1051/0004-6361/201936155⟩ |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361/201936155⟩ |
| Popis: | We aim to provide spectroscopic evidence regarding the nature of the putative star cluster in Eridanus 2 and to place constraints on the mass and abundance of massive astrophysical compact halo objects (MACHOs) as a constituent of dark matter. Methods. We present spectroscopic observations of the central square arcminute of Eridanus 2 from MUSE-Faint, a survey of ultra-faint dwarf galaxies with the Multi Unit Spectroscopic Explorer on the Very Large Telescope. We derive line-of-sight velocities for possible member stars of the putative cluster and for stars in the centre of Eridanus 2. We discuss the existence of the cluster and determine new constraints for MACHOs using the Fokker-Planck diffusion approximation. Results. Out of 182 extracted spectra, we identify 26 member stars of Eridanus 2, seven of which are possible cluster members. We find intrinsic mean line-of-sight velocities of $79.7^{+3.1}_{-3.8}\,\mathrm{km}\,\mathrm{s}^{-1}$ and $76.0^{+3.2}_{-3.7}\,\mathrm{km}\,\mathrm{s}^{-1}$ for the cluster and the bulk of Eridanus 2, respectively, and intrinsic velocity dispersions of ${ Comment: 17 pages, 12 figures, 3 tables. 1 electronic table included in source. Accepted for publication in A&A. New in this version: correction to author list |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|