Star Formation Suppresion by Tidal Removal of Cold Molecular Gas from an Intermediate-Redshift Massive Post-Starburst Galaxy

Abstract

Observations and simulations have demonstrated that star formation in galaxies must be actively suppressed to prevent the formation of over-massive galaxies. Galactic outflows driven by stellar feedback or supermassive black hole accretion are often invoked to regulate the amount of cold molecular gas available for future star formation, but may not be the only relevant quenching processes in all galaxies. We present the discovery of vast molecular tidal features extending up to 64 kpc outside of a massive z=0.646 post-starburst galaxy that recently concluded its primary star-forming episode. The tidal tails contain (1.2 +/- 0.1)x10^10 Msun of molecular gas, 47 +/- 5 % of the total cold gas reservoir of the system. Both the scale and magnitude of the molecular tidal features are unprecedented compared to all known nearby or high-redshift merging systems. We infer that the cold gas was stripped from the host galaxies during the merger, which is most likely responsible for triggering the initial burst phase and the subsequent suppression of star formation. While only a single example, this result shows that galaxy mergers can regulate the cold gas contents in distant galaxies by directly removing a large fraction of the molecular gas fuel, and plausibly suppress star formation directly, a qualitatively different physical mechanism than feedback-driven outflows.

arXiv commentPublished in ApJL, 8 pages, 5 figures

References in corpus (50)

• Galactic Stellar and Substellar Initial Mass Function
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Star Formation in the Milky Way and Nearby Galaxies
• The CO-to-H2 Conversion Factor
• Detailed Decomposition of Galaxy Images. II. Beyond Axisymmetric Models
• Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• Simba: Cosmological Simulations with Black Hole Growth and Feedback
• ISM masses and the star formation law at Z = 1 to 6 // ALMA observations of dust continuum in 145 galaxies in the COSMOS survey field
• Deriving Physical Properties from Broadband Photometry with Prospector: Description of the Model and a Demonstration of its Accuracy Using 129 Galaxies in the Local Universe
• The effect of galaxy mass ratio on merger--driven starbursts
• Cool Outflows in Galaxies and their Implications
• The Evolution of Galaxy Mergers and Morphology at z<1.2 in the Extended Groth Strip
• The Evolution of the Star-forming Interstellar Medium across Cosmic Time
• Cold Molecular Outflows in the Local Universe
• Dynamical Modeling of NGC 7252 and the Return of Tidal Material
• How stellar feedback simultaneously regulates star formation and drives outflows
• MOSFIRE Spectroscopy of Quiescent Galaxies at 1.5 < z < 2.5. II - Star Formation Histories and Galaxy Quenching
• Observational constraints on the merger history of galaxies since $z\approx 6$: Probabilistic galaxy pair counts in the CANDELS fields
• The Structures of Distant Galaxies - III: The Merger History of over 20,000 Massive Galaxies at z < 1.2
• Abundant Molecular Gas in Tidal Dwarf Galaxies: On-going Galaxy Formation
• The evolution of post-starburst galaxies from z=2 to z= 0.5
• A census of metals at high and low redshifts and the connection between submillimetre sources and spheroid formation
• The CFHTLS Deep Catalog of Interacting Galaxies I. Merger Rate Evolution to z=1.2
• Kinematics of tidal tails in interacting galaxies: Tidal Dwarf Galaxies and projection effects
• Galaxy Merger Rates up to z $\sim$ 3 using a Bayesian Deep Learning Model $-$ A Major-Merger classifier using IllustrisTNG Simulation data
• The star formation histories of z~1 post-starburst galaxies
• Massive quenched galaxies at z~0.7 retain large molecular gas reservoirs
• Stellar feedback as the origin of an extended molecular outflow in a starburst galaxy
• Evolution Through the Post-Starburst Phase: Using Post-Starburst Galaxies as Laboratories for Understanding the Processes that Drive Galaxy Evolution
• Distribution and Kinematics of the Circum-nuclear Molecular Gas in the Seyfert 1 Galaxy NGC 3227
• VCC 2062: an old Tidal Dwarf Galaxy in the Virgo Cluster?
• ALMA Observations of a Candidate Molecular Outflow in an Obscured Quasar
• A Molecular Gas Bridge between the Taffy Galaxies
• Ubiquitous Molecular Outflows in z > 4 Massive, Dusty Galaxies I. Sample Overview and Clumpy Structure in Molecular Outflows on 500pc Scales
• Ubiquitous Molecular Outflows in z > 4 Massive, Dusty Galaxies II. Momentum-Driven Winds Powered by Star Formation in the Early Universe
• Studying the spatially resolved Schmidt-Kennicutt law in interacting galaxies: the case of Arp 158
• The Role of Active Galactic Nuclei in the Quenching of Massive Galaxies in the SQuiGGLE Survey
• Colliding molecular clouds in head-on galaxy collisions
• The Molecule-Rich Tail of the Peculiar Galaxy NGC 2782 (Arp 215)
• Why Post-Starburst Galaxies are Now Quiescent
• The Compact Structures of Massive $z\sim 0.7$ Post-Starburst Galaxies in the SQuIGG$\vec{L}$E Sample
• Molecular gas and dust in Arp 94: The formation of a recycled galaxy in an interacting system
• A Molecular Tidal Tail in the Medusa Minor Merger
• Luminous Infrared Galaxies with the Submillimeter Array V: Molecular Gas in Intermediate to Late-stage Mergers
• SQuIGG$\vec{L}$E Survey: Massive z$\sim$0.6 Post-Starburst Galaxies Exhibit Flat Age Gradients
• Concurrent starbursts in molecular gas disks within a pair of colliding galaxies at z = 1.52
• Complex molecular gas kinematics in the inner 5 kpc of 4C12.50 as seen by ALMA
• A titanic interstellar medium ejection from a massive starburst galaxy at redshift 1.4
• SDSS J0025-10 at z=0.30: a (U)LIRG to optical QSO transition candidate

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• Merger Signatures are Common, but not Universal, In Massive, Recently-Quenched Galaxies at z~0.7
• COALAS III: The ATCA CO(1-0) look at the growth and death of H$\alpha$ emitters in the Spiderweb protocluster at z=2.16
• DESI Survey Validation Spectra Reveal an Increasing Fraction of Recently Quenched Galaxies at $z\sim 1$
• Little impact of mergers and galaxy morphology on the production and escape of ionizing photons in the early Universe
• Uncovering Tidal Treasures: Automated Classification of Faint Tidal Features in DECaLS Data
• Extreme Tidal Stripping May Explain the Overmassive Black Hole in Leo I: a Proof of Concept
• SQuIGG$\vec{L}$E: Observational Evidence of Low Ongoing Star Formation Rates in Gas-Rich Post-Starburst Galaxies
• The Dragonfly Galaxy. III. Jet-brightening of a High-redshift Radio Source Caught in a Violent Merger of Disk Galaxies
• The S-PLUS Fornax Project (S+FP): Mapping H$\alpha$+[NII] emission in 77 Fornax galaxy members reaching $\sim$4 Rvir
• Central Concentration of Asymmetric Features in Post-starburst Galaxies at $z\sim 0.8$
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