A 30 kpc Spatially Extended Clumpy and Asymmetric Galactic Outflow at z $\sim$ 1.7

Abstract

We image the spatial extent of a cool galactic outflow with fine structure Fe II${}^{\ast }$ emission and resonant Mg II emission in a gravitationally lensed star-forming galaxy at $z=1.70347$. The Fe II${}^{\ast }$ and Mg II (continuum-subtracted) emissions span out to radial distances of $\sim$14.33 kpc and 26.5 kpc, respectively, with maximum spatial extents of $\sim$21 kpc for Fe II${}^{\ast }$ emission and $\sim$30 kpc for Mg II emission. Mg II residual emission is patchy and covers a total area of $\sim$184 kpc${}^2$, constraining the minimum area covered by the outflowing gas to be $\sim$13% of the total area. Mg II emission is asymmetric and shows $\sim$21% more extended emission along the declination direction. We constrain the covering fractions of the Fe II${}^{\ast }$ and Mg II emission as a function of radial distance and characterize them with a power law model. The Mg II 2803 emission line shows two kinematically distinct emission components, and may correspond to two distinct shells of outflowing gas with a velocity separation of $\Delta v\sim$ 400 km/s. By using multiple images with different magnifications of the galaxy in the image plane, we trace the Fe II${}^{\ast }$, Mg II emissions around three individual star-forming regions. In all cases, both the Fe II${}^{\ast }$ and Mg II emissions are more spatially extended compared to the star forming regions traced by the [O II] emission. These findings provide robust constraints on the spatial extent of the outflowing gas, and combined with outflow velocity and column density measurements will give stringent constraints on mass outflow rates of the galaxy.

arXiv comment22 pages, 14 figures, 4 tables, accepted to ApJ, the referee comments are incorporated in this version

References in corpus (60)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Starburst99: Synthesis Models for Galaxies with Active Star Formation
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Galactic Winds
• Galaxies on FIRE (Feedback In Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
• Physical Models of Galaxy Formation in a Cosmological Framework
• Rest-Frame Ultraviolet Spectra of z~3 Lyman Break Galaxies
• The Circumgalactic Medium
• On the Maximum Luminosity of Galaxies and Their Central Black Holes: Feedback From Momentum-Driven Winds
• The MUSE second-generation VLT instrument
• A Bayesian approach to strong lensing modelling of galaxy clusters
• AGN wind scaling relations and the co-evolution of black holes and galaxies
• Ubiquitous outflows in DEEP2 spectra of star-forming galaxies at z=1.4
• Stellar Feedback in Galaxies and the Origin of Galaxy-scale Winds
• Hubble Space Telescope Observations of the Lensing Cluster Abell 2218
• The Cosmic Baryon Cycle and Galaxy Mass Assembly in the FIRE Simulations
• Evidence for Ubiquitous Collimated Galactic-Scale Outflows along the Star-Forming Sequence at z~0.5
• The Systematic Properties of the Warm Phase of Starburst-Driven Galactic Winds
• ZAP -- Enhanced PCA Sky Subtraction for Integral Field Spectroscopy
• The radial and azimuthal profiles of Mg II absorption around 0.5 < z < 0.9 zCOSMOS galaxies of different colors, masses and environments
• Multi-scale cluster lens mass mapping I. Strong Lensing modelling
• Scaling Relations Between Warm Galactic Outflows and Their Host Galaxies
• Simple Models of Metal-Line Absorption and Emission from Cool Gas Outflows
• The dependence of Galactic outflows on the properties and orientation of zCOSMOS galaxies at z ~ 1
• The Red-sequence Cluster Survey-2 (RCS-2): survey details and photometric catalog construction
• Star formation quenching in massive galaxies
• The largely unconstrained multiphase nature of outflows in AGN host galaxies
• Physical Conditions in the Low-Ionization Component of Starburst Outflows: The Shape of Near-Ultraviolet and Optical Absorption-Line Troughs in Keck Spectra of ULIRGs
• An Ultraviolet Spectroscopic Atlas of Local Starbursts and Star-Forming Galaxies: The Legacy of FOS and GHRS
• A Review of Recent Observations of Galactic Winds Driven by Star Formation
• A 100-kiloparsec wind feeding the circumgalactic medium of a massive compact galaxy
• Low-ionization Line Emission from Starburst Galaxies: A New Probe of Galactic-Scale Outflows
• Cosmic distribution of highly ionized metals and their physical conditions in the EAGLE simulations
• Optically-Thin Spatially-Resolved Mg II Emission Maps the Escape of Ionizing Photons
• Nuclear Outflow of the Milky Way: Studying the Kinematics and Spatial Extent of the Northern Fermi Bubble
• A clumpy and anisotropic galaxy halo at z=1 from gravitational-arc tomography
• Shining A Light On Galactic Outflows: Photo-Ionized Outflows
• Scattered Emission from z~1 Galactic Outflows
• Baryon Cycling in the Low-Redshift Circumgalactic Medium: A Comparison of Simulations to the COS-Halos Survey
• Circumgalactic Mg II Emission from an Isotropic Starburst Galaxy Outflow Mapped by KCWI
• Strong Lens Models for 37 Clusters of Galaxies from the SDSS Giant Arcs Survey
• MusE GAs FLOw and Wind (MEGAFLOW) VIII. Discovery of a MgII emission halo probed by a quasar sightline
• A Magnified View of the Kinematics and Morphology of RCSGA 032727-132609: Zooming in on a Merger at z=1.7
• Source Plane Reconstruction of The Bright Lensed Galaxy RCSGA 032727-132609
• Galaxies probing galaxies: cool halo gas from a z = 0.47 post-starburst galaxy
• The Magellan Evolution of Galaxies Spectroscopic and Ultraviolet Reference Atlas (MEGaSaURA) I: The Sample and the Spectra
• A Robust Measurement of the Mass Outflow Rate of the Galactic Outflow from NGC 6090
• Spatially Resolved Galactic Wind in Lensed Galaxy RCSGA 032727-132609
• Stellar Populations of Highly Magnified Lensed Galaxies: Young Starbursts at z~2
• Galactic Winds with MUSE: A Direct Detection of FeII* Emission from a z = 1.29 Galaxy
• The cold circumgalactic medium in emission: MgII halos in TNG50
• A bright, spatially extended lensed galaxy at z = 1.7 behind the cluster RCS2 032727-132623
• The MUSE Hubble Ultra Deep Field Survey: VII. FeII* Emission in Star-Forming Galaxies
• Feeding the fire: Tracing the mass-loading of 10^7 K galactic outflows with O VI absorption
• Hydrogen Emission from the Ionized Gaseous Halos of Low Redshift Galaxies
• Violent quenching: molecular gas blown to 1000 km/s during a major merger
• ALMA resolves the molecular gas in a young low-metallicity starburst galaxy at z=1.7
• Resolved galactic superwinds reconstructed around their host galaxies at z>3

Cited by in corpus (6)

• Bipolar Outflows out to 10~kpc for Massive Galaxies at Redshift $z\approx 1$
• Metal line emission from galaxy haloes at z~1
• Linking Mg II and [O II] spatial distribution to ionizing photon escape in confirmed LyC leakers and non-leakers
• Spatially Resolved Circumgalactic Medium around a Star-Forming Galaxy Driving a Galactic Outflow at $z\approx 0.8$
• The Transition from Galaxy-wide Gas Inflow to Outflow in Quasar Host Galaxies
• Modeling Emission-Line Surface Brightness in a Multiphase Galactic Wind: An O VI Case Study