Exploring the Impact of Galactic Interactions and Mergers on the Central Star Formation of APEX/EDGE-CALIFA Galaxies

Abstract

Galactic interactions and subsequent mergers are a paramount channel for galaxy evolution. In this work, we use the data from 236 star forming CALIFA galaxies with integrated molecular gas observations in their central region (approximately within an effective radius) -- from the APEX millimeter telescope and the CARMA millimeter telescope array. This sample includes isolated (126 galaxies) and interacting galaxies in different merging stages (110 galaxies; from pairs, merging and post-merger galaxies). We show that the impact of interactions and mergers in the center of galaxies is revealed as an increase in the fraction of molecular gas (compared to isolated galaxies). Furthermore, our results suggest that the change in star formation efficiency is the main driver for both an enhancement and/or suppression of the central star formation -- except in merging galaxies where the enhanced star formation appears to be driven by an increase of molecular gas. We suggest that gravitational torques due to the interaction and subsequent merger transport cold molecular gas inwards, increasing the gas fraction without necessarily increasing star formation.

arXiv comment3 Figures, 13 Pages. Accepted for publication in ApJ

References in corpus (51)

• The Sloan Digital Sky Survey: Technical Summary
• Star Formation in the Milky Way and Nearby Galaxies
• Theoretical Modeling of Starburst Galaxies
• Secular Evolution and the Formation of Pseudobulges in Disk Galaxies
• CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation
• The Star Formation Rate of Turbulent Magnetized Clouds: Comparing Theory, Simulations, and Observations
• HERACLES: The HERA CO-Line Extragalactic Survey
• Galaxy Pairs in the Sloan Digital Sky Survey I: Star Formation, AGN Fraction, and the Luminosity/Mass-Metallicity Relation
• A Direct Measurement of Major Galaxy Mergers at z < 3
• Optical and Near-Infrared Imaging of the IRAS 1-Jy Sample of Ultraluminous Infrared Galaxies: II. The Analysis
• Galaxy pairs in the Sloan Digital Sky Survey - IV: Interactions trigger AGN
• Variations in the Galactic star formation rate and density thresholds for star formation
• PMAS, the Potsdam Multi-Aperture Spectrophotometer. I. Design, Manufacture, and Performance
• Galaxy pairs in the Sloan Digital Sky Survey - VIII: The observational properties of post-merger galaxies
• PMAS: The Potsdam Multi Aperture Spectrophotometer. II. The Wide Integral Field Unit PPak
• CALIFA, the Calar Alto Legacy Integral Field Area survey: IV. Third Public data release
• Molecular and atomic gas along and across the main sequence of star-forming galaxies
• Galaxy Pairs in the Sloan Digital Sky Survey - V. Tracing changes in star formation rate and metallicity out to separations of 80 kpc
• The impact of interactions, bars, bulges, and AGN on star formation efficiency in local massive galaxies
• Galaxy pairs in the Sloan Digital Sky Survey - VI. The orbital extent of enhanced star formation in interacting galaxies
• Spatially-Resolved Spectroscopic Properties of Low-Redshift Star-Forming Galaxies
• Spatially-Resolved Star Formation Main Sequence of Galaxies in the CALIFA Survey
• The link between turbulence, magnetic fields, filaments, and star formation in the Central Molecular Zone cloud G0.253+0.016
• Star formation rates and efficiencies in the Galactic Centre
• Galaxy Pairs in the Sloan Digital Sky Survey - II: The Effect of Environment on Interactions
• The EDGE-CALIFA Survey: Interferometric Observations of 126 Galaxies with CARMA
• Interaction-induced star formation in a complete sample of 10^5 nearby star-forming galaxies
• Galaxy Pairs in the Sloan Digital Sky Survey - III: Evidence of Induced Star Formation from Optical Colours
• Close Pairs of Field Galaxies in the CNOC1 Redshift Survey
• The Spitzer Spirals, Bridges, and Tails Interacting Galaxy Survey: Interaction-Induced Star Formation in the Mid-Infrared
• Tracing kinematic (mis)alignments in CALIFA merging galaxies: Stellar and ionized gas kinematic orientations at every merger stage
• The ALMaQUEST Survey: The molecular gas main sequence and the origin of the star forming main sequence
• SDSS-IV MaNGA: Effects of Morphology in the global and local Star Formation Main Sequences
• Spatially resolved star formation and fuelling in galaxy interactions
• Galaxies hosting an AGN: a view from the CALIFA survey
• Recent star formation in the inner Galactic Bulge seen by ISOGAL II -- The Central Molecular Zone
• The ALMaQUEST Survey: V. The non-universality of kpc-scale star formation relations and the factors that drive them
• The Effect of Galaxy Interactions on Molecular Gas Properties
• Galaxy pairs in the SDSS - XIII. The connection between enhanced star formation and molecular gas properties in galaxy mergers
• The EDGE-CALIFA Survey: Using Optical Extinction to Probe the Spatially-Resolved Distribution of Gas in Nearby Galaxies
• The EDGE-CALIFA survey: The local and global relations between ${\Sigma }_{\ast }$ , ${\Sigma }_{SFR}$ and ${\Sigma }_{mol}$ that regulate star-formation
• Systematic study of outflows in the Local Universe using CALIFA: I. Sample selection and main properties
• ALMaQUEST -- IV. The ALMA-MaNGA QUEnching and STar formation (ALMaQUEST) Survey
• The EDGE-CALIFA survey: exploring the role of the molecular gas on the galaxy star formation quenching
• A Hubble Space Telescope Snapshot Survey of Dynamically Close Galaxy Pairs in the CNOC2 Redshift Survey
• EDGE-CALIFA survey: Self-regulation of Star formation at kpc scales
• The ALMaQUEST Survey: II. What drives central starbursts at z~0?
• The ALMaQUEST Survey X: What powers merger induced star formation?
• CO Multi-line Imaging of Nearby Galaxies (COMING). X. Physical conditions of molecular gas and the local SFR-Mass relation
• Cold Molecular Gas in Merger Remnants. II. The properties of dense molecular gas
• Properties of Molecular Gas in Galaxies in Early and Mid Stages of Interaction. III. Resolved Kennicutt-Schmidt Law

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• The THESAN-ZOOM project: Burst, quench, repeat -- unveiling the evolution of high-redshift galaxies along the star-forming main sequence
• The EDGE-CALIFA survey: Star formation relationships for galaxies at different stages of their evolution
• Living with Neighbors. V. Better-aligned Spiral+Spiral Galaxy Pairs Show Stronger Star Formation
• Probing the Infrared/Radio correlation of the full IRAS Revised Bright Galaxy Sample with MeerKAT and the VLA
• Selecting Post-Starburst Galaxies Based on Star Formation History
• Dynamically close galaxy pairs from the unWISE survey: Testing the merger-AGN-star formation connection