The AMIGA sample of isolated galaxies. XIV. Disc breaks and interactions through ultra-deep optical imaging

Abstract

In the standard cosmological model of galaxy evolution, mergers and interactions play a fundamental role in shaping galaxies. Galaxies that are currently isolated are thus interesting, allowing us to distinguish between internal and external processes affecting the galactic structure. However, current observational limits may obscure crucial information in the low-mass or low-brightness regime. We use optical imaging of a subsample of the AMIGA catalogue of isolated galaxies to explore the impact of different factors on the structure of these galaxies. We study the type of disc break as a function of the degree of isolation and the presence of interaction indicators like tidal streams or plumes only detectable in the low surface brightness regime. We present deep optical imaging of a sample of 25 isolated galaxies. Through careful data processing and analysis techniques, the surface brightness limits achieved are comparable to those to be obtained on the 10-year LSST coadds. The extreme depth of our imaging allows us to study the interaction signatures of 20 galaxies, given that the presence of Galactic cirrus is a strong limiting factor in the characterisation of interactions for the remaining 5 of them. We detect previously unreported interaction features in 8 (40%) galaxies in our sample. We identify 9 galaxies (36%) showing an exponential disc (Type I), 14 galaxies (56%) with down-bending (Type II) profile and only 2 galaxies (8%) with up-bending (Type III) profiles. Isolated galaxies have considerably more purely exponential discs and fewer up-bending surface brightness profiles than field or cluster galaxies. We suggest that major mergers produce up-bending profiles while a threshold in star formation probably forms down-bending profiles. Unperturbed galaxies, evolving slowly with a low star formation rate could cause the high rate of Type I discs in isolated galaxies observed.

20 pages, 7 figures, and 2 tables (incl. 2 appendix). Accepted for publication in A&A. Images and profiles will be made publicly available upon publication

References in corpus (30)

• Galaxy Merger Morphologies and Time-Scales from Simulations of Equal-Mass Gas-Rich Disc Mergers
• Tracing Galaxy Formation with Stellar Halos II: Relating Substructure in Phase- and Abundance-Space to Accretion Histories
• The Atlas3D project -- XXIX. The new look of early-type galaxies and surrounding fields disclosed by extremely deep optical images
• The structure of galactic disks: Studying late-type spiral galaxies using SDSS
• Color Profiles of Spiral Galaxies: Clues on Outer-Disk Formation Scenarios
• The Burrell Schmidt Deep Virgo Survey: Tidal Debris, Galaxy Halos, and Diffuse Intracluster Light in the Virgo Cluster
• The AMIGA sample of isolated galaxies. V. Quantification of the isolation
• The Sloan Digital Sky Survey Stripe 82 Imaging Data: Depth-Optimized Co-adds Over 300 Deg^2 in Five Filters
• The influence of diffuse scattered light I. The PSF and its role to observations of the edge-on galaxy NGC 5907
• Preparing for low surface brightness science with the Vera C. Rubin Observatory: characterisation of tidal features from mock images
• The Sloan Digital Sky Survey extended point spread functions
• A unified picture of breaks and truncations in spiral galaxies from SDSS and S^{4}G imaging
• The AMIGA sample of isolated galaxies. IV. A catalogue of neighbours around isolated galaxies
• Formation of S0 galaxies through mergers. V. Antitruncated stellar discs resulting from major mergers
• Hidden depths in the local Universe: The Stellar Stream Legacy Survey
• Color Profiles of Disk Galaxies since z~1: Probing Outer Disk Formation Scenarios
• Introducing the LBT Imaging of Galactic Halos and Tidal Structures (LIGHTS) survey. A preview of the low surface brightness Universe to be unveiled by LSST
• The Structure and Stellar Content of the Outer Disks of Galaxies: A New View from the Pan-STARRS1 Medium Deep Survey
• Disk galaxies with broken luminosity profiles from cosmological simulations
• The AMIGA sample of isolated galaxies XIII. The HI content of an almost "nurture free" sample
• Galaxies in voids assemble their stars slowly
• Discovery and analysis of low-surface-brightness galaxies in the environment of NGC 1052
• On the varied origins of up-bending breaks in galaxy disks
• IRAC Near-Infrared Features in the Outer Parts of S4G Galaxies
• Massive Early-Type Galaxies in the HSC-SSP: Flux Fraction of Tidal Features and Merger Rates
• The Extended Disk Galaxy Exploration Science Survey: Description and Surface Brightness Profile Properties
• A ~ 12 kpc HI extension and other HI asymmetries in the isolated galaxy CIG 340 (IC 2487)
• New Constraints on the Origin of Surface Brightness Profile Breaks of Disk Galaxies from MaNGA
• Fully Adaptive Bayesian Algorithm for Data Analysis, FABADA
• Satellites and central galaxies in SDSS: the influence of interactions on their properties

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