Stellar feedback in a clumpy galaxy at $z\sim$ 3.4

Abstract

Giant star-forming regions (clumps) are widespread features of galaxies at $z\approx 1-4$. Theory predicts that they can play a crucial role in galaxy evolution if they survive to stellar feedback for > 50 Myr. Numerical simulations show that clumps' survival depends on the stellar feedback recipes that are adopted. Up to date, observational constraints on both clumps' outflows strength and gas removal timescale are still uncertain. In this context, we study a line-emitting galaxy at redshift $z\simeq 3.4$ lensed by the foreground galaxy cluster Abell 2895. Four compact clumps with sizes $\lesssim$ 280 pc and representative of the low-mass end of clumps' mass distribution (stellar masses $\lesssim 2\times 10^8{\mathrm{M}}_{\odot }$) dominate the galaxy morphology. The clumps are likely forming stars in a starbursting mode and have a young stellar population ($\sim$ 10 Myr). The properties of the Lyman-$\alpha$ (Ly$\alpha$) emission and nebular far-ultraviolet absorption lines indicate the presence of ejected material with global outflowing velocities of $\sim$ 200-300 km/s. Assuming that the detected outflows are the consequence of star formation feedback, we infer an average mass loading factor ($\eta$) for the clumps of $\sim$ 1.8 - 2.4 consistent with results obtained from hydro-dynamical simulations of clumpy galaxies that assume relatively strong stellar feedback. Assuming no gas inflows (semi-closed box model), the estimates of $\eta$ suggest that the timescale over which the outflows expel the molecular gas reservoir ($\simeq 7\times 10^8{\text{M}}_{\odot }$) of the four detected low-mass clumps is $\lesssim$ 50 Myr.

19 pages, 11 figures + Appendix. Published in MNRAS

References in corpus (46)

• The Gaia mission
• Cold streams in early massive hot haloes as the main mode of galaxy formation
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• A Bayesian approach to strong lensing modelling of galaxy clusters
• From rings to bulges: evidence for rapid secular galaxy evolution at z~2 from integral field spectroscopy in the SINS survey
• Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
• The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN
• Understanding Galaxy Evolution through Emission Lines
• 3D Lyman-alpha radiation transfer. I. Understanding Lyman-alpha line profile morphologies
• The Evolution of Galaxy Structure over Cosmic Time
• The rapid formation a large rotating disk galaxy three billion years after the Big Bang
• The Data Processing Pipeline for the MUSE Instrument
• Intense Star Formation within Resolved Compact Regions in a Galaxy at z=2.3
• Ly-alpha Emission-Line Galaxies at z = 3.1 in the Extended Chandra Deep Field South
• The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection
• Bulge Formation by the Coalescence of Giant Clumps in Primordial Disk Galaxies
• Lyman Alpha Emitting Galaxies as a Probe of Reionization
• Clumpy Galaxies in CANDELS. I. The Definition of UV Clumps and the Fraction of Clumpy Galaxies at 0.5<z<3
• Mass and magnification maps for the Hubble Space Telescope Frontier Fields clusters: implications for high redshift studies
• Lyman-alpha spectral properties of five newly discovered Lyman continuum emitters
• Observations of the Lyman-$\alpha$ Universe
• The Ly-alpha Properties of Faint Galaxies at z2-3 with Systemic Redshifts and Velocity Dispersions from Keck-MOSFIRE
• Resolved spectroscopy of gravitationally lensed galaxies: global dynamics and star-forming clumps on ~100pc scales
• 3D Lyman-alpha radiation transfer. III. Constraints on gas and stellar properties of z~3 Lyman break galaxies (LBG) and implications for high-z LBGs and Lyman-alpha emitters(LAEs)
• Lyman alpha Resonant Scattering in Young Galaxies - Predictions from Cosmological Simulations
• The nature of giant clumps in distant galaxies probed by the anatomy of the Cosmic Snake
• Shocked Superwinds from the z~2 Clumpy Star-forming Galaxy, ZC406690
• DYNAMO-HST Survey: Clumps in Nearby Massive Turbulent Disks and the Effects of Clump Clustering on Kiloparsec Scale Measurements of Clumps
• Deep spectroscopy of the FUV-optical emission lines from a sample of radio galaxies at z~2.5: metallicity and ionization
• Resolved Spectroscopy of a Gravitationally Lensed L* Lyman-break Galaxy at z~5
• Old and young bulges in late-type disk galaxies
• The MUSE Deep Lensed Field on the Hubble Frontier Field MACS~J0416
• Where is the matter in the Merging Cluster Abell 2218?
• Modelling CO emission from hydrodynamic simulations of nearby spirals, starbursting mergers, and high-redshift galaxies
• An extremely young massive clump forming by gravitational collapse in a primordial galaxy
• On the stellar masses of giant clumps in distant star-forming galaxies
• Directional Lya equivalent boosting I. Spherically symmetric distributions of clumps
• Physical Properties of Sub-galactic Clumps at 0.5 $\le z\le$ 1.5 in the UVUDF
• Evolution of the Fraction of Clumpy Galaxies at 0.2<z<1.0 in the COSMOS field
• LEGUS and Halpha-LEGUS Observations of Star Clusters in NGC 4449: Improved Ages and the Fraction of Light in Clusters as a Function of Age
• Constraining Lyman-alpha spatial offsets at $3<z<5.5$ from VANDELS slit spectroscopy
• Star-forming Clumps in Local Luminous Infrared Galaxies
• Star-forming clumps in the Lyman Alpha Reference Sample of galaxies -- I. Photometric analysis and clumpiness
• Star Formation at z=2.481 in the Lensed Galaxy SDSS J1110+6459, II: What is missed at the normal resolution of the Hubble Space Telescope?
• IROCKS: Spatially resolved kinematics of z~1 star forming galaxies
• Relation between parameters of dust and parameters of molecular and atomic gas in extragalactic star-forming regions