Keck Spectroscopy of NGC 1052-DF9: Stellar Populations in the Context of the NGC 1052 Group
arXiv:2306.08540 · doi:10.1093/mnras/stad1883
Abstract
In this study, we use Keck/KCWI spectroscopy to measure the age, metallicity and recessional velocity of NGC~1052-DF9 (DF9), a dwarf galaxy in the NGC~1052 group. We compare these properties to those of two other galaxies in the group, NGC~1052-DF2 and NGC~1052-DF4, which have low dark matter content. The three galaxies are proposed constituents of a trail of galaxies recently hypothesised to have formed as part of a ``bullet dwarf'' collision. We show that the ages and total metallicities of the three galaxies are within uncertainties of one another which may be expected if they share a related formation pathway. However, the recessional velocity we recover for DF9 (1680 10 km s) is higher than predicted for a linearly projected interpretation of the ``bullet dwarf'' trail. DF9 is then either not part of the trail or the correlation of galaxy velocities along the trail is not linear in 2D projection due to their 3D geometry. After examining other proposed formation pathways for the galaxies, none provide a wholly satisfactory explanation for all of their known properties. We conclude further work is required to understand the formation of this interesting group of galaxies.
6 pages, 3 figures, 2 tables. Submitted to arxiv after including minor changes requested by the MNRAS referee in the second round of comments
References in corpus (33)
- Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
- Forty-Seven Milky Way-Sized, Extremely Diffuse Galaxies in the Coma Cluster
- Evolutionary stellar population synthesis with MILES - II. Scaled-solar and α-enhanced models
- A second galaxy missing dark matter in the NGC1052 group
- The Cosmic Evolution of Metallicity from the SDSS Fossil Record
- Still Missing Dark Matter: KCWI High-Resolution Stellar Kinematics of NGC1052-DF2
- A trail of dark matter-free galaxies from a bullet dwarf collision
- The ultra-diffuse galaxy NGC 1052-DF2 with MUSE: II. The population of DF2: stars, clusters and planetary nebulae
- Ultra-diffuse galaxies without dark matter
- The galaxy "missing dark matter" NGC1052-DF4 is undergoing tidal disruption
- Dark-matter-deficient dwarf galaxies form via tidal stripping of dark matter in interactions with massive companions
- Galaxies lacking dark matter produced by close encounters in a cosmological simulation
- A Tip of the Red Giant Branch Distance of Mpc to the Dark Matter Deficient Galaxy NGC1052-DF2 from 40 Orbits of Hubble Space Telescope Imaging
- Diversity of nuclear star cluster formation mechanisms revealed by their star formation histories
- Dark Matter Deficient Galaxies Produced Via High-velocity Galaxy Collisions In High-resolution Numerical Simulations
- Metal-poor nuclear star clusters in two dwarf galaxies near Centaurus A suggesting formation from the in-spiraling of globular clusters
- A Complex Luminosity Function for the Anomalous Globular Clusters in NGC1052-DF2 and NGC1052-DF4
- Dark Matter Deficient Galaxies And Their Member Star Clusters Form Simultaneously During High-velocity Galaxy Collisions In 1.25 pc Resolution Simulations
- On the Stellar Kinematics and Mass of the Virgo Ultra-Diffuse Galaxy VCC 1287
- A tidal tale: detection of multiple stellar streams in the environment of NGC1052
- Creating a galaxy lacking dark matter in a dark matter dominated universe
- Tidal Distortions in NGC1052-DF2 and NGC1052-DF4: Independent Evidence for a Lack of Dark Matter
- The stellar populations of quiescent ultra-diffuse galaxies from optical to mid-infrared spectral energy distribution fitting
- Nuclear star cluster formation in star-forming dwarf galaxies
- Discovery and analysis of low-surface-brightness galaxies in the environment of NGC 1052
- A diffuse tidal dwarf galaxy destined to fade out as a "dark galaxy"
- Constraining the formation of NGC1052-DF2 from its unusual globular cluster population
- Monochromatic globular clusters as a critical test of formation models for the dark matter deficient galaxies NGC1052-DF2 and NGC1052-DF4
- Stellar content, planetary nebulae, and globular clusters of [KKS2000]04 (NGC1052-DF2)
- Constraints on the HI Mass of NGC 1052-DF2
- On the Evolution of the Globular Cluster System in NGC 1052-DF2: Dynamical Friction, Globular-Globular Interactions and Galactic Tides
- Formation of an ultra-diffuse galaxy in the stellar filaments of NGC3314A: caught in act?
- The large-scale structure of globular clusters in the NGC 1052 group