Formation of an ultra-diffuse galaxy in the stellar filaments of NGC3314A: caught in act?

Abstract

The VEGAS imaging survey of the Hydra I cluster reveals an extended network of stellar filaments to the south-west of the spiral galaxy NGC3314A. Within these filaments, at a projected distance of ~40 kpc from the galaxy, we discover an ultra-diffuse galaxy (UDG) with a central surface brightness of ${\mu }_{0,g}\sim 26$ mag arcsec${}^{-2}$ and effective radius $R_e\sim 3.8$ kpc. This UDG, named UDG32, is one of the faintest and most diffuse low-surface brightness galaxies in the Hydra~I cluster. Based on the available data, we cannot exclude that this object is just seen in projection on top of the stellar filaments, thus being instead a foreground or background UDG in the cluster. However, the clear spatial coincidence of UDG32 with the stellar filaments of NGC3314A suggests that it might have formed from the material in the filaments, becoming a detached, gravitationally bound system. In this scenario, the origin of UDG32 depends on the nature of the stellar filaments in NGC3314A, which is still unknown. They could result from ram-pressure stripping or have a tidal origin. In this letter, we focus on the comparison of the observed properties of the stellar filaments and UDG32, and speculate about their possible origin. The relatively red color ($g-r=0.54\pm 0.14$~mag) of the UDG, similar to that of the disk in NGC3314A, combined with an age older than 1Gyr, and the possible presence of a few compact stellar systems, all point towards a tidal formation scenario inferred for the UDG32.

Accepted for publication in Astronomy & Astrophysics Letter

References in corpus (29)

• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• NIHAO XI: Formation of Ultra-Diffuse Galaxies by outflows
• A High Stellar Velocity Dispersion and ~100 Globular Clusters for the Ultra Diffuse Galaxy Dragonfly 44
• The abundance of ultra-diffuse galaxies from groups to clusters: UDGs are relatively more common in more massive haloes
• Identification of old tidal dwarfs near early-type galaxies from deep imaging and HI observations
• The Next Generation Virgo Cluster Survey (NGVS). XXX. Ultra-Diffuse Galaxies and their Globular Cluster Systems
• Globular Clusters in Coma Cluster Ultra Diffuse Galaxies (UDGs): Evidence for Two Types of UDG?
• GASP IV: A muse view of extreme ram-pressure stripping in the plane of the sky: the case of jellyfish galaxy JO204
• The early-type dwarf galaxy population of the Hydra I cluster
• Observational Properties of Ultra-Diffuse Galaxies in the Field: Field-UDGs are Predominantly Blue and Starforming
• Halo mass estimates from the Globular Cluster populations of 175 Low Surface Brightness Galaxies in the Fornax Cluster
• The galaxy "missing dark matter" NGC1052-DF4 is undergoing tidal disruption
• Tidal dwarf galaxies in cosmological simulations
• GASP XXIX -- Unwinding the arms of spiral galaxies via ram-pressure stripping
• Extreme chemical abundance ratio suggesting an exotic origin for an ultra-diffuse galaxy
• WALLABY Pilot Survey: the diversity of ram pressure stripping of the galactic HI gas in the Hydra Cluster
• How large are the globular cluster systems of early-type galaxies and do they scale with galaxy halo properties?
• Andromeda XXI -- a dwarf galaxy in a low density dark matter halo
• The first detection of ultra-diffuse galaxies in the Hydra I cluster from VEGAS survey
• The Distribution of Ultra-Diffuse and Ultra-Compact Galaxies in the Frontier Fields
• Deep Imaging of the HCG 95 Field.I.Ultra-diffuse Galaxies
• Newly discovered dwarf galaxies in the MATLAS low density fields
• An Ultra diffuse Galaxy in the NGC 5846 group from the VEGAS survey
• The Fornax Deep Survey with VST. IX. The catalog of sources in the FDS area, with an example study for globular clusters and background galaxies
• A tidal tale: detection of multiple stellar streams in the environment of NGC1052
• A Photometric and Kinematic Analysis of UDG1137+16 (dw1137+16): Probing Ultra-Diffuse Galaxy Formation in a Group Environment
• Tidal origin of NGC 1427A in the Fornax cluster
• Ultra Diffuse Galaxies in the IC1459 Group from the VEGAS Survey
• Exploring the origin of ultra-diffuse galaxies in clusters from their primordial alignment

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• The Nature of Low Surface Brightness Galaxies in the Hyper Suprime-Cam Survey
• The Galaxy Replacement Technique (GRT): a New Approach to Study Tidal Stripping and Formation of Intracluster Light in a Cosmological Context
• Keck Spectroscopy of NGC 1052-DF9: Stellar Populations in the Context of the NGC 1052 Group
• Looking into the faintEst WIth MUSE (LEWIS): Exploring the nature of ultra-diffuse galaxies in the Hydra I cluster III. Untangling UDG 32 from the stripped filaments of NGC 3314A with multi-wavelength data
• Looking into the faintEst WIth MUSE (LEWIS): Exploring the nature of ultra-diffuse galaxies in the Hydra-I cluster IV. A study of the Globular Cluster population in four UDGs
• Looking into the faintEst WIth MUSE (LEWIS): on the nature of ultra-diffuse galaxies in the Hydra I cluster. V. Integrated stellar population properties
• Dark matter mass loss in galaxy flybys: dependence on impact parameter