[O II] nebular emission from Mg II absorbers: Star formation associated with the absorbing gas

Abstract

We present nebular emission associated with 198 strong Mg II absorbers at 0.35 $\le z\le$ 1.1 in the fibre spectra of quasars from the Sloan Digital Sky Survey. Measured [O II] luminosities (L${}_{[OII]}$) are typical of sub-L${}^{\star }$ galaxies with derived star formation rate (uncorrected for fibre losses and dust reddening) in the range of 0.5-20 ${\mathrm{M}}_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$. Typically less than $\sim$ 3% of the Mg II systems with rest equivalent width, $W_{2796}$ $\ge$ 2 Å, show L${}_{[OII]}\ge 0.3$ L${}_{[OII]}^{\star }$. The detection rate is found to increase with increasing $W_{2796}$ and $z$. No significant correlation is found between $W_{2796}$ and L${}_{[OII]}$ even when we restrict the samples to narrow $z$-ranges. A strong correlation is seen between L${}_{[OII]}$ and $z$. While this is expected from the luminosity evolution of galaxies, we show finite fibre size plays a very crucial role in this correlation. The measured nebular line ratios (like [O III]/[O II] and [O III]/H$\beta$) and their $z$ evolution are consistent with those of galaxies detected in deep surveys. Based on the median stacked spectra, we infer the average metallicity (log Z $\sim$8.3), ionization parameter (log $q$ $\sim$7.5) and stellar mass (log (M/M${}_{\odot }$)$\sim$9.3). The Mg II systems with nebular emission typically have $W_{2796}$ $\ge 2$ Å, Mg II doublet ratio close to 1 and W(Fe II$\lambda$2600)/$W_{2796}$ $\sim 0.5$ as often seen in damped Ly$\alpha$ and 21-cm absorbers at these redshifts. This is the biggest reported sample of [O II] emission from Mg II absorbers at low impact parameters ideally suited for probing various feedback processes at play in $z\le 1$ galaxies.

arXiv comment18 Pages, 18 Figures, 4 Tables (Accepted for the Publication in MNRAS main-journal)

References in corpus (68)

• The Seventh Data Release of the Sloan Digital Sky Survey
• The Global Schmidt Law in Star Forming Galaxies
• Theoretical Modeling of Starburst Galaxies
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• Spectral Classification and Redshift Measurement for the SDSS-III Baryon Oscillation Spectroscopic Survey
• Strong Nebular Line Ratios in the Spectra of z~2-3 Star-forming Galaxies: First Results from KBSS-MOSFIRE
• Ubiquitous outflows in DEEP2 spectra of star-forming galaxies at z=1.4
• Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample
• 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 radial and azimuthal profiles of Mg II absorption around 0.5 < z < 0.9 zCOSMOS galaxies of different colors, masses and environments
• Demographics and Physical Properties of Gas Out/Inflows at 0.4 < z < 1.4
• An Empirical Characterization of Extended Cool Gas Around Galaxies Using MgII Absorption Features
• The Sloan Digital Sky Survey quasar catalog: ninth data release
• Discovery of Damped Lyman-Alpha Systems at Redshifts Less Than 1.65 and Results on their Incidence and Cosmological Mass Density
• The Kinematic Connection Between QSO-Absorbing Gas and Galaxies at Intermediate Redshift
• The JHU-SDSS metal absorption line catalog: redshift evolution and properties of Mg II absorbers
• Improved and Quality-assessed Emission and Absorption Line measurements in Sloan Digital Sky Survey galaxies
• The Direct Detection of Cool, Metal-Enriched Gas Accretion onto Galaxies at z ~ 0.5
• Theoretical Modeling of Star-Forming Galaxies I. Emission Line Diagnostic Grids for Local and Low-Metallicity Galaxies
• MAGIICAT II. General Characteristics of the MgII Absorbing Circumgalactic Medium
• New perspectives on strong z=0.5 MgII absorbers: are halo-mass and equivalent width anti-correlated?
• Halo Gas Cross Sections And Covering Fractions of MgII Absorption Selected Galaxies
• The dependence of Galactic outflows on the properties and orientation of zCOSMOS galaxies at z ~ 1
• Halo Gas and Galaxy Disk Kinematics Derived from Observations and LCDM Simulations of MgII Absorption Selected Galaxies at Intermediate Redshift
• Low and High Ionization Absorption Properties of Mg II Absorption-Selected Galaxies at Intermediate Redshifts. I. General Properties
• The Population of Weak MgII Absorbers. II The Properties of Single-Cloud Systems
• 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
• Quasars Probing Galaxies: I. Signatures of Gas Accretion at Redshift Approximately 0.2
• What Determines the Incidence and Extent of MgII Absorbing Gas Around Galaxies?
• MAGIICAT I. The MgII Absorber-Galaxy Catalog
• Morphological Properties of z~0.5 Absorption-Selected Galaxies: The Role of Galaxy Inclination
• Large scale outflows from z ~ 0.7 starburst galaxies identified via ultra-strong MgII quasar absorption lines
• Probing star formation across cosmic time with absorption line systems
• The SINFONI MgII Program for Line Emitters (SIMPLE): Discovering starbursts near QSO sight-lines
• On the HI content, dust-to-gas ratio and nature of MgII absorbers
• MAGIICAT III. Interpreting Self-Similarity of the Circumgalactic Medium with Virial Mass using MgII Absorption
• "Direct" Gas-phase Metallicities, Stellar Properties, and Local Environments of Emission-line Galaxies at Redshift below 0.90
• Quasars probing intermediate redshift star-forming galaxies
• Discovery of a Primitive Damped Lyman alpha Absorber Near an X-ray Bright Galaxy Group in the Virgo Cluster
• A Groundbased Imaging Study of Galaxies Causing DLA, subDLA, and LLS Absorption in Quasar Spectra
• A rise in the ionizing photons in star-forming galaxies over the past 5 billion years
• The metallicity evolution of low mass galaxies: New constraints at intermediate redshift
• The Nature of H$\beta +$[O{\sc iii}] and [O{\sc ii}] emitters to $z\sim 5$ with HiZELS: stellar mass functions and the evolution of EWs
• Galaxies probing galaxies: cool halo gas from a z = 0.47 post-starburst galaxy
• Discovery of Multi-Phase Cold Accretion in a Massive Galaxy at z=0.7
• Confirmation of Small Dynamical and Stellar Masses for Extreme Emission Line Galaxies at z~2
• Radiative transfer through the Intergalactic Medium
• Ultra-strong MgII Absorbers as a Signature of Cool Intragroup Gas
• Search for cold gas in strong MgII absorbers at 0.5<z<1.5: nature and evolution of 21-cm absorbers
• The structural and size evolution of star-forming galaxies over the last 11 Gyrs
• Cold gas accretion by high-velocity clouds and their connection to QSO absorption-line systems
• Metal-poor, Strongly Star-Forming Galaxies in the DEEP2 Survey: The Relationship between Stellar Mass, Temperature-based Metallicity, and Star Formation Rate
• The star formation rate of CaII and damped Lyman-alpha absorbers at 0.4<z<1.3
• Mg II Absorption Characteristics of a Volume-Limited Sample of Galaxies at z ~ 0.1
• Using 21cm Absorption in Small Impact Parameter Galaxy-QSO Pairs to Probe Low-Redshift Damped and Sub-Damped Lyman-alpha System
• The evolution of the [OII], Hβ and [OIII] emission-line luminosity functions over the last nine billions years
• The Smooth MgII gas distribution through the interstellar/extra-planar/halo interface
• Physical conditions of the interstellar medium in star-forming galaxies at z~1.5
• Large-Scale Star Formation-Driven Outflows at 1<z<2 in the 3D-HST Survey
• A Kennicutt-Schmidt Law for Intervening Absorption Line Systems
• The Milky Way halo as a QSO absorption-line system. New results from an HST/STIS absorption-line catalogue of Galactic high-velocity clouds
• Incidence of HI 21-cm absorption in strong FeII systems at $0.5<z<1.5$
• On the Observed W_MgII--L_[OII] Correlation in SDSS QSO Spectra
• Galaxies with Background QSOs, I: A Search for Strong Galactic H-alpha Lines
• Galactic nebular lines in the fiber spectra of background QSOs: Reaching a hundred QSO-galaxy pairs with spectroscopic and photometric measurements
• The Ly$\alpha$ emission from high-$z$ galaxies hosting strong Damped Ly$\alpha$ systems
• Analysis of Low z Absorbers in the QSO Spectra

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• Damped Ly-alpha Absorbers in Star-forming Galaxies at z < 0.15 Detected with the Hubble Space Telescope and Implications for Galaxy Evolution
• Eclipsing damped Ly$\alpha$ systems in the Sloan Digital Sky Survey Data Release 12
• Host Galaxies of Ultra Strong Mg II absorbers at z $\sim$ 0.5
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• Revealing the host galaxy of a quasar 2175 Å dust absorber at z = 2.12
• Baryonic Ecosystem in Galaxies (BEINGMgII) -- II. Unveiling the Nature of Galaxies Harboring Cool Gas Reservoirs
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• Physical conditions and redshift evolution of optically thin C III absorbers: Low-z sample
• HI 21-cm Absorption Associated with Foreground Galaxies on Top of Quasars
• Baryonic Ecosystem IN Galaxies (BEINGMgII) -- III. Cool gas reservoirs at $0.3\le z\le 1.6$ in the Dark Energy Survey