MOSFIRE and LDSS3 Spectroscopy for an [OII] Blob at z=1.18: Gas Outflow and Energy Source

Abstract

We report our Keck/MOSFIRE and Magellan/LDSS3 spectroscopy for an [OII] Blob, OIIB10, that is a high-$z$ galaxy with spatially extended [OII]$\lambda \lambda 3726,3729$ emission over 30 kpc recently identified by a Subaru large-area narrowband survey. The systemic redshift of OIIB10 is $z=1.18$ securely determined with [OIII]$\lambda \lambda 4959,5007$ and H$\beta$ emission lines. We identify FeII$\lambda$2587 and MgII$\lambda \lambda$2796,2804 absorption lines blueshifted from the systemic redshift by $80\pm 50$ and $260\pm 40$ km s${}^{-1}$, respectively, which indicate gas outflow from OIIB10 with the velocity of $\sim 80-260$ km s${}^{-1}$. This outflow velocity is comparable with the escape velocity, $250\pm 140$ km s${}^{-1}$, estimated under the assumption of a singular isothermal halo potential profile. Some fraction of the outflowing gas could escape from the halo of OIIB10, suppressing OIIB10's star-formation activity. We estimate a mass loading factor, $\eta$, that is a ratio of mass outflow rate to star-formation rate, and obtain $\eta >0.8\pm 0.1$ which is relatively high compared with low-$z$ starbursts including U/LIRGs and AGNs. The major energy source of the outflow is unclear with the available data. Although no signature of AGN is found in the X-ray data, OIIB10 falls in the AGN/star-forming composite region in the line diagnostic diagrams. It is possible that the outflow is powered by star formation and a type-2 AGN with narrow FWHM emission line widths of $70-130$ km s${}^{-1}$. This is the first detailed spectroscopic study of oxygen-line blobs, which includes the analyses of the escape velocity, the mass loading factor, and the presence of an AGN, and a significant step to understanding the nature of oxygen-line blobs and the relation with gas outflow and star-formation quenching at high redshift.

arXiv comment14 pages, 8 figures, 4 tables. Accepted for publication in the Astrophysical Journal

References in corpus (118)

• Stellar population synthesis at the resolution of 2003
• Star Formation in Galaxies Along the Hubble Sequence
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The Seventh Data Release of the Sloan Digital Sky Survey
• The Host Galaxies of AGN
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Detailed Structural Decomposition of Galaxy Images
• Theoretical Modeling of Starburst Galaxies
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Host Galaxies and Classification of Active Galactic Nuclei
• Hierarchical Galaxy Formation
• Galaxy Bimodality due to Cold Flows and Shock Heating
• Rest-Frame Ultraviolet Spectra of z~3 Lyman Break Galaxies
• A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
• Using Strong Lines to Estimate Abundances in Extragalactic HII Regions and Starburst Galaxies
• The Mass-Metallicity Relation at z~2
• The Structure and Kinematics of the Circum-Galactic Medium from Far-UV Spectra of z~2-3 Galaxies
• On the Maximum Luminosity of Galaxies and Their Central Black Holes: Feedback From Momentum-Driven Winds
• A Unified Representation of Gas-Phase Element Depletions in the Interstellar Medium
• The Herschel Multi-tiered Extragalactic Survey: HerMES
• Metallicities of 0.3<z<1.0 Galaxies in the GOODS-North Field
• Mapping Large-Scale Gaseous Outflows in Ultraluminous Galaxies with Keck II ESI Spectra: Variations in Outflow Velocity with Galactic Mass
• Absorption-Line Probes of Gas and Dust in Galactic Superwinds
• Lyman Alpha Imaging of a Proto-Cluster Region at <z>=3.09
• Ubiquitous outflows in DEEP2 spectra of star-forming galaxies at z=1.4
• Determining Star Formation Rates for Infrared Galaxies
• Stellar Feedback in Galaxies and the Origin of Galaxy-scale Winds
• The history of star formation in a LCDM universe
• Outflows in Infrared-Luminous Starbursts at z < 0.5. II. Analysis and Discussion
• Simulating galactic outflows with thermal supernova feedback
• New constraints on the evolution of the stellar-to-dark matter connection: a combined analysis of galaxy-galaxy lensing, clustering, and stellar mass functions from z=0.2 to z=1
• New Observations of the Interstellar Medium in the Lyman Break Galaxy MS 1512-cB58
• Diffuse Lyman Alpha Emitting Halos: A Generic Property of High Redshift Star Forming Galaxies
• Ionization State of Inter-Stellar Medium in Galaxies: Evolution, SFR-M_star-Z Dependence, and Ionizing Photon Escape
• The Discovery of 1000 km/s Outflows in Massive Post-starburst Galaxies at z=0.6
• The Multiphase Structure and Power Sources of Galactic Winds in Major Mergers
• Demographics and Physical Properties of Gas Out/Inflows at 0.4 < z < 1.4
• A Subaru Search for Ly-alpha Blobs in and around the Proto-cluster Region at Redshift z=3.1
• The Subaru/XMM-Newton Deep Survey (SXDS) - II. Optical Imaging and Photometric Catalogs
• Extreme Feedback and the Epoch of Reionization: Clues in the Local Universe
• Cooling Radiation and the Lyman-alpha Luminosity of Forming Galaxies
• Escape of Ionizing Radiation from High Redshift Galaxies
• Galaxy-Wide Shocks in Late-Merger Stage Luminous Infrared Galaxies
• Keck Absorption-Line Spectroscopy of Galactic Winds in Ultraluminous Infrared Galaxies
• Radiation pressure from massive star clusters as a launching mechanism for super-galactic winds
• Outflows in AGN/Starburst-Composite Ultraluminous Infrared Galaxies
• Lyman Alpha Cooling Radiation from High-Redshift Halos
• A New Diagnostic of Active Galactic Nuclei: Revealing Highly-Absorbed Systems at Redshift>0.3
• Ionized gas outflows and global kinematics of low-z luminous star forming galaxies
• Galaxies in a Simulated $\Lambda$CDM Universe II: Observable Properties and Constraints on Feedback
• The UKIRT Infrared Deep Sky Survey First Data Release
• Outflows in Infrared-Luminous Starbursts at z < 0.5. I. Sample, NaI D Spectra, and Profile Fitting
• The Persistence of Cool Galactic Winds in High Stellar Mass Galaxies Between z~1.4 and ~1
• Physical Properties of Emission-Line Galaxies at z ~ 2 from Near-Infrared Spectroscopy with Magellan FIRE
• A Survey of Galaxy Kinematics to z ~ 1 in the TKRS/GOODS-N Field. I. Rotation and Dispersion Properties
• Lyman Alpha Blobs as an Observational Signature of Cold Accretion Streams into Galaxies
• The Subaru/XMM-Newton Deep Survey (SXDS): III. X-Ray Data
• The Luminosity-Metallicity relation in the local universe from the 2dF Galaxy Redshift Survey
• On the Escape of Ionizing Radiation from Starbursts
• The Escape of Ionizing Photons from OB Associations in Disk Galaxies: Radiation Transfer Through Superbubbles
• Extended Ly-alpha emission from a damped Ly-alpha absorber at z = 1.93, and the relation between DLAs and Lyman-break galaxies
• Gravity-driven Lyman-alpha blobs from cold streams into galaxies
• Superwind model of extended Lyman alpha emitters at high redshift
• Diffuse Lyman-alpha Halos around Galaxies at z=2.2-6.6: Implications for Galaxy Formation and Cosmic Reionization
• Galactic Outflows in Absorption and Emission: Near-UV Spectroscopy of Galaxies at 1<z<2
• Discovery of a Giant Lya Emitter Near the Reionization Epoch
• What is the physical origin of strong Lya emission? II. Gas Kinematics and Distribution of Lya Emitters
• The Properties and Prevalence of Galactic Outflows at z = 1 in the Extended Groth Strip
• Lyman-alpha emission properties of simulated galaxies: interstellar medium structure and inclination effects
• HiZELS: a high redshift survey of H-alpha emitters. II: the nature of star-forming galaxies at z=0.84
• FUSE Observations of Outflowing OVI in the Dwarf Starburst Galaxy NGC1705
• Simple Models of Metal-Line Absorption and Emission from Cool Gas Outflows
• Discovery of a Large ~200 kpc Gaseous Nebula at z=2.7 with the Spitzer Space Telescope
• A Lyman-alpha blob in the GOODS South field: evidence for cold accretion onto a dark matter halo
• Keck Spectroscopy of Faint 3 < z < 7 Lyman Break Galaxies: III. The Mean Ultraviolet Spectrum at z=4
• On the Physical Origin of OVI Absorption-Line Systems
• Ionizing radiation from z=4-10 galaxies
• Internal Kinematics of Distant Field Galaxies: I. Emission Line Widths for a Complete Sample of Faint Blue Galaxies at <z>=0.25
• The Chandra Deep Protocluster Survey: Ly-alpha Blobs are powered by heating, not cooling
• First Spectroscopic Evidence for High Ionization State and Low Oxygen Abundance in Lya Emitters
• Line Transfer through Clumpy, Large-Scale Outflows: Lyman Alpha Absorption and Halos around Starforming 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
• Gas Motion Study of Lya Emitters at z~2 Using UV and Optical Spectral Lines
• The Influence of Supershells and Galactic Outflows on the Escape of Ionizing Radiation from Dwarf Starburst Galaxies
• Lyman alpha Resonant Scattering in Young Galaxies - Predictions from Cosmological Simulations
• A Keck/HIRES Study of Kinematics of the Cold Interstellar Medium in Dwarf Starburst Galaxies
• The discovery of a galaxy-wide superwind from a young massive galaxy at redshift z~3
• Lyman Alpha Radiation From Collapsing Protogalaxies II: Observational Evidence for Gas Infall
• Spectral classification of emission-line galaxies from the Sloan Digital Sky Survey. I. An improved classification for high redshift galaxies
• Extended Lyman Alpha Nebulae at z ~ 2.3: An Extremely Rare and Strongly Clustered Population?
• Galactic porosity and a star formation threshold for the escape of ionising radiation from galaxies
• The Subaru Ly-alpha blob survey: A sample of 100 kpc Ly-alpha blobs at z=3
• Low-ionization Line Emission from Starburst Galaxies: A New Probe of Galactic-Scale Outflows
• The Distribution of Lya-Emitting Galaxies at z=2.3
• New diagnostic methods for emission-line galaxies in deep surveys
• Central Powering of the Largest Lyman-alpha Nebula is Revealed by Polarized Radiation
• AEGIS: Demographics of X-ray and Optically Selected AGNs
• Outflowing Galactic Winds in Post-starburst and AGN Host Galaxies at 0.2<z<0.8
• A Pair of Compact Red Galaxies at Redshift 2.38, Immersed in a 100 kpc Scale Ly-alpha Nebula
• Extended Lyman-Alpha Emission around Star-forming Galaxies
• Evidence for Cold Accretion onto a Massive Galaxy at High Redshift?
• Deep SAURON Spectral-Imaging of the diffuse Lyman-alpha halo LAB1 in SSA22
• Scattered Emission from z~1 Galactic Outflows
• Systematic Survey of Extended Lyman-alpha Sources over z~3-5
• The Nature of Lya Blobs: Supernova-Dominated Primordial Galaxies
• The Emission-Line Spectra of Major Mergers: Evidence for Shocked Outflows
• On the Origin of Lyman-$\alpha$ Blobs at High Redshift: Kinematic Evidence for a Hyperwind Galaxy at z = 3.1
• Resolving the optical emission lines of Lya blob 'B1' at z=2.38: another hidden quasar
• The escape of ionizing photons from supernova-dominated primordial galaxies
• Resolving the Galaxies within a Giant Lya Nebula: Witnessing the Formation of a Galaxy Group?
• Spitzer observations of extended Lyman-alpha Clouds in the SSA22 field
• Evolution of Star Formation in the UKIDSS Ultra Deep Survey Field - I. Luminosity Functions and Cosmic Star Formation Rate out to z=1.6
• Dissecting the Lyman Alpha Emission Halo of LAB1
• Ultraviolet-Bright, High-Redshift ULIRGS
• Effect of Intergalactic Medium on the Observability of Lyman Alpha Emitters during Cosmic Reionization
• First Systematic Search for Oxygen-Line Blobs at High Redshift: Uncovering AGN Feedback and Star-Formation Quenching
• Transonic galactic outflows in a dark matter halo with a central black hole and its application to the Sombrero galaxy
• Subaru Spectroscopy of the Giant Ly$\alpha$ Nebula Associated with the High-$z$ Powerful Radio Galaxy 1243+036

Cited by in corpus (9)

• Evolution of Stellar-to-Halo Mass Ratio at z=0-7 Identified by Clustering Analysis with the Hubble Legacy Imaging and Early Subaru/Hyper Suprime-Cam Survey Data
• A Close Comparison between Observed and Modeled Lyα Lines for z ~ 2.2 Lyman Alpha Emitters
• The MUSE Hubble Ultra Deep Field Survey: XII. MgII emission and absorption in star-forming galaxies
• Ionised gas structure of 100 kpc in an over-dense region of the galaxy group COSMOS-Gr30 at z ~ 0.7
• The MUSE Hubble Ultra Deep Field Survey: VII. FeII* Emission in Star-Forming Galaxies
• Systematic Survey for [OII], [OIII], and H$\alpha$ Blobs at $z=0.1-1.5$: The Implication for Evolution of Galactic-Scale Outflow
• Bimodal morphologies of massive galaxies at the core of a protocluster at z=3.09 and the strong size growth of a brightest cluster galaxy
• IR characteristic emission and dust properties of star-forming galaxies at 4.5 $<$ z $<$ 6.2
• A Giant Green Pea Identified in the Spectroscopy of Spatially Extended [OIII] Sources