Rendezvous in CAVITY: Kinematics and gas properties of an isolated dwarf-dwarf merging pair in a cosmic void region
arXiv:2504.15359 · doi:10.1051/0004-6361/202453556
Abstract
Galaxy mergers are pivotal events in the evolutionary history of galaxies, with their impact believed to be particularly significant in dwarf galaxies. We report the serendipitous identification of an isolated merging dwarf system with a total stellar mass of M10M, located in the centre of a cosmic void. This system is one of the rare examples, and possibly the first, of merging dwarf galaxy pairs studied within the central region of a cosmic void. Using CAVITY PPAK-IFU data combined with deep optical broadband imaging from the Isaac Newton Telescope, we analysed the kinematics and ionized gas properties of each dwarf galaxy in the system by employing a full spectral fitting technique. The orientation of this merging pair relative to the line of sight allowed us to determine the dynamical mass of each component, showing that both had similar dynamical masses within galactocentric distances of up to 2.9 kpc. While the gas-phase metallicity of both components is consistent with that of star-forming dwarf galaxies, the star formation rates observed in both components exceed those typically reported for equally massive star-forming dwarf galaxies. This indicates that the merger has presumably contributed to enhancing star formation. Furthermore, we found no significant difference in the optical g-r colour of this merging pair compared to other merging dwarf pairs across different environments. While most merging events occur in group-like environments with high galaxy density and the tidal influence of a host halo, and isolated mergers typically involve galaxies with significant mass differences, the identified merging pair does not follow these patterns. We speculate that the global dynamics of the void or past three-body encounters involving components of this pair and a nearby dwarf galaxy might have triggered this merging event.
arXiv comment18 pages, 11 figures, accepted for publication in Astronomy & Astrophysics
References in corpus (102)
- SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
- Astropy: A Community Python Package for Astronomy
- The NumPy array: a structure for efficient numerical computation
- Star Formation in Galaxies Along the Hubble Sequence
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- The Host Galaxies of AGN
- Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
- The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
- The physical properties of star forming galaxies in the low redshift universe
- Theoretical Modeling of Starburst Galaxies
- The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
- Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
- Hierarchical Galaxy Formation
- [O III]/[N II] as an Abundance Indicator at High Redshift
- UV Star Formation Rates in the Local Universe
- MILES: A Medium resolution INT Library of Empirical Spectra
- A large stellar evolution database for population synthesis studies. I. Scaled solar models and isochrones
- Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
- Formation of Massive Galaxies at High Redshift: Cold Streams, Clumpy Disks and Compact Spheroids
- An updated MILES stellar library and stellar population models
- Line formation in solar granulation: IV. [O I], OI and OH lines and the photospheric O abundance
- The Merger Rates and Mass Assembly Histories of Dark Matter Haloes in the Two Millennium Simulations
- A comprehensive classification of galaxies in the SDSS: How to tell true from fake AGN?
- Dust-Corrected Star Formation Rates of Galaxies. I. Combinations of H-alpha and Infrared Tracers
- How Do Disks Survive Mergers?
- UV-extended E-MILES stellar population models: young components in massive early-type galaxies
- A Direct Measurement of Major Galaxy Mergers at z < 3
- Mergers and Bulge Formation in Lambda-CDM: Which Mergers Matter?
- Formation of a spiral galaxy in a major merger
- A new chemo-evolutionary population synthesis model for early-type galaxies. I: Theoretical basis
- The Mass-Metallicity and the Fundamental Metallicity Relation revisited on a fully Te-based abundance scale for galaxies
- Two distinct ancient components in the Sculptor Dwarf Spheroidal Galaxy: First Results from DART
- The ATLAS project - XXV: Two-dimensional kinematic analysis of simulated galaxies and the cosmological origin of fast and slow rotators
- The Last of FIRST: The Final Catalog and Source Identifications
- The Void Phenomenon
- Galaxy pairs in the Sloan Digital Sky Survey - VIII: The observational properties of post-merger galaxies
- Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters
- Galaxy pairs in the Sloan Digital Sky Survey - IX: Merger-induced AGN activity as traced by the Wide-field Infrared Survey Explorer
- Cosmic Voids in Sloan Digital Sky Survey Data Release 7
- Dynamical Modeling of NGC 7252 and the Return of Tidal Material
- Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. I. On the possible disk nature of bright early-type dwarfs
- On the origin of the faint-end of the red sequence in high density environments
- Nucleosynthesis and the Inhomogeneous Chemical Evolution of the Carina Dwarf Galaxy
- Dwarfs Gobbling Dwarfs: A Stellar Tidal Stream Around NGC 4449 and Hierarchical Galaxy Formation on Small Scales
- Catalogues of isolated galaxies, isolated pairs, and isolated triplets in the local Universe
- The role of mergers in driving morphological transformation over cosmic time
- Formation of blue compact dwarf galaxies from merging and interacting gas-rich dwarfs
- TiNy Titans: The Role of Dwarf-Dwarf Interactions in the Evolution of Low Mass Galaxies
- A radio spectral index map and catalogue at 147-1400 MHz covering 80 per cent of the sky
- Galactic cirri in deep optical imaging
- Cosmic Voids: structure, dynamics and galaxies
- Satellite Dwarf Galaxies in a Hierarchical Universe: The Prevalence of Dwarf-Dwarf Major Mergers
- Shell Structure in the Fornax Dwarf Spheroidal Galaxy
- The mass-metallicity relation of interacting galaxies
- Enhanced atomic gas fractions in recently merged galaxies: quenching is not a result of post-merger gas exhaustion
- A survey of dual active galactic nuclei in simulations of galaxy mergers: frequency and properties
- Only the Lonely: H I Imaging of Void Galaxies
- Spatially resolved star formation and metallicity profiles in post-merger galaxies from MaNGA
- The remnant of a merger between two dwarf galaxies in Andromeda II
- Galaxy interactions I: Major and minor mergers
- Discovery of a close pair of faint dwarf galaxies in the halo of Centaurus A
- A tidally distorted dwarf galaxy near NGC 4449
- A catalog of merging dwarf galaxies in the local universe
- The role of mergers and interactions in driving the evolution of dwarf galaxies over cosmic time
- An Interacting Galaxy System Along a Filament in a Void
- The grouping, merging and survival of subhaloes in the simulated Local Group
- The ALFALFA-SDSS Galaxy Catalog
- Hidden depths in the local Universe: The Stellar Stream Legacy Survey
- xGASS: Cold gas content and quenching in galaxies below the star forming main sequence
- Aperture-free star formation rate of SDSS star-forming galaxies
- Double Starbursts Triggered by Mergers in Hierarchical Clustering Scenarios
- Galaxy interactions II: High density environments
- Assembly of filamentary void galaxy configurations
- The Late Stellar Assembly of Massive Cluster Galaxies Via Major Merging
- Star Formation in Isolated Dwarf Galaxies Hosting Tidal Debris: Extending the Dwarf-Dwarf Merger Sequence
- DDO 68: A flea with smaller fleas that on him prey
- The Fornax dwarf galaxy as a remnant of recent dwarf-dwarf merging in the Local Group
- The properties of early-type galaxies in the Ursa Major cluster
- The Importance of Interactions for Mass Loss from Satellite Galaxies in Cold Dark Matter Haloes
- Revealing the properties of void galaxies and their assembly using the EAGLE simulation
- Bar effect on gas-phase abundance gradients. I. Data sample and chemical abundances
- Dissecting the stellar content of Leo I: a dwarf irregular caught in transition
- LEDA 074886: A remarkable rectangular-looking galaxy
- THE NEXT GENERATION VIRGO CLUSTER SURVEY. XIV. Shell feature early-type dwarf galaxies in the Virgo cluster
- The Blue Compact Dwarf Galaxy VCC848 Formed by Dwarf-Dwarf Merging
- Stellar mass-metallicity relation throughout the large-scale structure of the Universe: CAVITY mother sample
- UGC 3672: An unusual merging triplet of gas-rich galaxies in the Lynx-Cancer void
- Clumpy Star Formation and AGN Activity in Dwarf-Dwarf Galaxy Merger Mrk 709
- Two Candidates for Dual AGN in Dwarf-Dwarf Galaxy Mergers
- CAVITY, Calar Alto Void Integral-field Treasury surveY and project extension
- The CAVITY project. The spatially resolved stellar population properties of galaxies in voids
- UGC 4703 interacting pair near to an isolated spiral galaxy NGC 2718: A Milky Way Magellanic Cloud analogue
- Effect of low-mass galaxy interactions on their star formation
- Merger-induced star formation in low-metallicity dwarf galaxy NGC 4809/4810
- J-PLUS: The star formation main sequence and rate density at d < 75 Mpc
- Do galaxy mergers prefer under-dense environments?
- Evidence for globular cluster collapse after a dwarf-dwarf merger: A potential nuclear star cluster in formation
- Spatially resolved gas and stellar kinematics in compact starburst galaxies
- Merging Galaxies in Isolated Environments II. Evolution of Star Formation and Accretion Activity during the Merging Process
- SIT 45: An interacting, compact, and star-forming isolated galaxy triplet
- A MaNGA view of isolated galaxy mergers in the star-forming Main Sequence
- Merging galaxies in isolated environments I. Multiband photometry, classification, stellar masses, and star formation rates