On the radial profile of gas-phase Fe/α ratio around distant galaxies

Abstract

This paper presents a study of the chemical compositions in cool gas around a sample of 27 intermediate-redshift galaxies. The sample comprises 13 massive quiescent galaxies at z=0.40-0.73 probed by QSO sightlines at projected distances d=3-400 kpc, and 14 star-forming galaxies at z=0.10-1.24 probed by QSO sightlines at d=8-163 kpc. The main goal of this study is to examine the radial profiles of the gas-phase Fe/α ratio in galaxy halos based on the observed Fe II to Mg II column density ratios. Because Mg+ and Fe+ share similar ionization potentials, the relative ionization correction is small in moderately ionized gas and the observed ionic abundance ratio N(Fe II)/N(Mg II) places a lower limit to the underlying (Fe/Mg) elemental abundance ratio. For quiescent galaxies, a median and dispersion of log <N(Fe II)/N(Mg II)> =-0.06+/-0.15 is found at d<~60 kpc, which declines to log <N(Fe II)/N(Mg II)> <-0.3 at d>~100 kpc. On the other hand, star-forming galaxies exhibit log <N(Fe II)/N(Mg II)> =-0.25+/-0.21 at d<~60 kpc and log <N(Fe II)/N(Mg II)> =-0.9+/-0.4 at larger distances. Including possible differential dust depletion or ionization correction would only increase the inferred (Fe/Mg) ratio. The observed N(FeII)/N(Mg II) implies super-solar Fe/α ratios in the inner halo of quiescent galaxies. An enhanced Fe abundance indicates a substantial contribution by Type Ia supernovae in the chemical enrichment, which is at least comparable to what is observed in the solar neighborhood or in intracluster media but differs from young star-forming regions. In the outer halos of quiescent galaxies and in halos around star-forming galaxies, however, the observed N(Fe II)/N(Mg II) is consistent with an α-element enhanced enrichment pattern, suggesting a core-collapse supernovae dominated enrichment history.

arXiv comment12 pages, 6 figures, accepted for publication in MNRAS

References in corpus (51)

• The chemical composition of the Sun
• Starburst99: Synthesis Models for Galaxies with Active Star Formation
• The Baryon Oscillation Spectroscopic Survey of SDSS-III
• Nucleosynthesis in Chandrasekhar Mass Models for Type Ia Supernovae and Constraints on Progenitor Systems and Burning-Front Propagation
• Galaxy Luminosity Functions to z~1: DEEP2 vs. COMBO-17 and Implications for Red Galaxy Formation
• Nucleosynthesis Yields of Core-Collapse Supernovae and Hypernovae, and Galactic Chemical Evolution
• Gaseous Galaxy Halos
• The Cosmic Origins Spectrograph
• The Atlas3D project -- IV: the molecular gas content of early-type galaxies
• The Atlas3D project -- XIII. Mass and morphology of HI in early-type galaxies as a function of environment
• Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample
• Metallicity Evolution of Damped Lyman-alpha Systems out to z~5
• An Empirical Characterization of Extended Cool Gas Around Galaxies Using MgII Absorption Features
• Radiation pressure from massive star clusters as a launching mechanism for super-galactic winds
• The Bimodal Metallicity Distribution of the Cool Circumgalactic Medium at z<1
• The Kinematic Connection Between QSO-Absorbing Gas and Galaxies at Intermediate Redshift
• Simulations of disk galaxies with cosmic ray driven galactic winds
• The excitation of spiral density waves through turbulent fluctuations in accretion discs II: Numerical Simulations with MRI driven turbulence
• QSO Metal Absorption Systems at High Redshift and the Signature of Hierarchical Galaxy Formation
• MAGIICAT II. General Characteristics of the MgII Absorbing Circumgalactic Medium
• The Gaseous Extent of Galaxies and the Origin of \lya Absorption Systems. III. Hubble Space Telescope Imaging of \lya-Absorbing Galaxies at z < 1
• Halo Gas and Galaxy Disk Kinematics Derived from Observations and LCDM Simulations of MgII Absorption Selected Galaxies at Intermediate Redshift
• The Gaseous Extent of Galaxies and the Origin of Lya Absorption Systems. V. Optical and Near-Infrared Photometry of Lya-absorbing Galaxies at z < 1
• Abundance Profiles and Kinematics of Damped Lyman-alpha Absorbing Galaxies at z < 0.65
• Constraining supernova models using the hot gas in clusters of galaxies
• QSO Absorbing Galaxies at z<~1: Deep Imaging and Spectroscopy in the Field of 3C 336
• Low and High Ionization Absorption Properties of Mg II Absorption-Selected Galaxies at Intermediate Redshifts. I. General Properties
• A Chandra Survey of Early-Type Galaxies, I: Metal Enrichment in the ISM
• The Population of Weak MgII Absorbers. II The Properties of Single-Cloud Systems
• The Physical Conditions of Intermediate Redshift MgII Absorbing Clouds from Voigt Profile Analysis
• Morphological Properties of z~0.5 Absorption-Selected Galaxies: The Role of Galaxy Inclination
• The Kinematics of Intermediate Redshift Mg II Absorbers
• A new comprehensive set of elemental abundances in DLAs - II. Data analysis and chemical variation studies
• The Large-scale Distribution of Cool Gas around Luminous Red Galaxies
• The Impact of Starbursts on the Circumgalactic Medium
• The Baryon Content of Dark Matter Halos: Empirical Constraints from MgII Absorbers
• Dust-depletion sequences in damped Lyman-α absorbers: a unified picture from low-metallicity systems to the Galaxy
• An Extreme Metallicity, Large-Scale Outflow from a Star-Forming Galaxy at z ~ 0.4
• Spatially Resolved Velocity Maps of Halo Gas Around Two Intermediate-redshift Galaxies
• Preventing Star Formation in Early-Type Galaxies with Late-Time Stellar Heating
• Probing the Cool Interstellar and Circumgalactic Gas of Three Massive Lensing Galaxies at z=0.4-0.7
• On the Spatial and Kinematic Distributions of Mg II Absorbing Gas in <z>=0.7 Galaxies
• Ultra-strong MgII Absorbers as a Signature of Cool Intragroup Gas
• Hubble Space Telescope Observations of Sub-Damped Lyman-alpha Absorbers at z < 0.5, and Implications for Galaxy Chemical Evolution
• The Chemical and Ionization Conditions in Weak Mg II Absorbers
• The radial distribution of type Ia supernovae in early-type galaxies: implications for progenitor scenarios
• The Star Formation History of Luminous Red Galaxies Hosting MgII Absorbers
• Dust depletion, chemical uniformity and environment of CaII H&K quasar absorbers
• The Abundance Pattern in the Hot ISM of NGC 4472: Insights and Anomalies
• An In-Depth Study of the Abundance Pattern in the Hot Interstellar Medium in NGC 4649
• The Abundance Pattern of O, Ne, Mg, and Fe in the Interstellar Medium of S0 Galaxy NGC 4382 Observed with Suzaku

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• The Cosmic Ultraviolet Baryon Survey (CUBS) I. Overview and the diverse environments of Lyman limit systems at z<1
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• Baryonic Ecosystem in Galaxies (BEINGMgII) -- II. Unveiling the Nature of Galaxies Harboring Cool Gas Reservoirs
• On the Metallicities and Kinematics of the Circumgalactic Media of Damped Ly$\alpha$ Systems at $z\sim 2.5$
• MUSEQuBES: Physical conditions, origins, and multi-element abundances of the circumgalactic medium of an isolated, star-forming dwarf galaxy at z=0.57