MApping the Most Massive Overdensities Through Hydrogen (MAMMOTH) I: Methodology

Abstract

Modern cosmology predicts that a galaxy overdensity is associated to a large reservoir of the intergalactic gas, which can be traced by the Ly$\alpha$ forest absorption. We have undertaken a systematic study of the relation between Coherently Strong intergalactic Ly$\alpha$ Absorption systems (CoSLAs), which have highest optical depth ($\tau$) in $\tau$ distribution, and mass overdensities on the scales of $\sim$ 10 - 20 $h^{-1}$ comoving Mpc. On such large scales, our cosmological simulations show a strong correlation between the effective optical depth (${\tau }_{\mathrm{eff}}$) of the CoSLAs and the 3-D mass overdensities. In moderate signal-to-noise spectra, however, the profiles of CoSLAs can be confused with high column density absorbers. For $z>2.6$, where the corresponding Ly$\beta$ is redshifted to the optical, we have developed the technique to differentiate between these two alternatives. We have applied this technique to SDSS-III quasar survey at $z=2.6$ - 3.3, and we present a sample of five CoSLA candidates with ${\tau }_{\mathrm{eff}}$ on 15 $h^{-1}$ Mpc greater than $4.5\times$ the mean optical depth. At lower redshifts of $z<2.6$, where the background quasar density is higher, the overdensity can be traced by intergalactic absorption groups using multiple sight lines. Our overdensity searches fully utilize the current and next generation of Ly$\alpha$ forest surveys which cover a survey volume of $>(1h^{-1}$ Gpc)${}^3$. In addition, systems traced by CoSLAs will build a uniform sample of the most massive overdensities at $z>2$ to constrain the models of structure formation, and offer a unique laboratory to study the interactions between galaxy overdensities and the intergalactic medium.

24 pages, 30 figures, 8 tables, submitted to the Astrophysical Journal

References in corpus (87)

• The cosmological simulation code GADGET-2
• The 2.5 m Telescope of the Sloan Digital Sky Survey
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• The Baryon Oscillation Spectroscopic Survey of SDSS-III
• Rest-Frame Ultraviolet Spectra of z~3 Lyman Break Galaxies
• The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
• The Large Scale Bias of Dark Matter Halos: Numerical Calibration and Model Tests
• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• Lyman Break Galaxies at Redshift z~3: Survey Description and Full Data Set
• Spectral Classification and Redshift Measurement for the SDSS-III Baryon Oscillation Spectroscopic Survey
• A very deep Chandra observation of the Perseus cluster: shocks, ripples and conduction
• Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
• 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
• A Survey of Star-Forming Galaxies in the z=1.4-2.5 `Redshift Desert': Overview
• Galaxies and Intergalactic Matter at Redshift z~3: Overview
• Multi-Wavelength Constraints on the Cosmic Star Formation History from Spectroscopy: the Rest-Frame UV, H-alpha, and Infrared Luminosity Functions at Redshifts 1.9<z<3.4
• The SDSS Damped Lya Survey: Data Release 3
• A cosmic web filament revealed in Lyman-alpha emission around a luminous high-redshift quasar
• The Linear Theory Power Spectrum from the Lyman-alpha Forest in the Sloan Digital Sky Survey
• Ancient Light from Young Cosmic Cities: Physical and Observational Signatures of Galaxy Proto-Clusters
• The Gaseous Environment of High-z Galaxies: Precision Measurements of Neutral Hydrogen in the Circumgalactic Medium of z ~ 2-3 Galaxies in the Keck Baryonic Structure Survey
• Column density distribution and cosmological mass density of neutral gas: Sloan Digital Sky Survey-III Data Release 9
• A Subaru Search for Ly-alpha Blobs in and around the Proto-cluster Region at Redshift z=3.1
• The SDSS-III Baryon Oscillation Spectroscopic Survey: Quasar Target Selection for Data Release Nine
• Evolution of the cosmological mass density of neutral gas from Sloan Digital Sky Survey II - Data Release 7
• The Connection Between Galaxies and Intergalactic Absorption Lines at Redshift 2<z<3
• The clustering of massive galaxies at z~0.5 from the first semester of BOSS data
• Measurement of Baryon Acoustic Oscillations in the Lyman-alpha Forest Fluctuations in BOSS Data Release 9
• Quasar Quartet Embedded in Giant Nebula Reveals Rare Massive Structure in Distant Universe
• The Sloan Digital Sky Survey quasar catalog: tenth data release
• The Discovery of Primeval Large-Scale Structures with Forming Clusters at Redshift 6
• The clustering of intermediate redshift quasars as measured by the Baryon Oscillation Spectroscopic Survey
• The Bimodal Metallicity Distribution of the Cool Circumgalactic Medium at z<1
• The Giant Gemini GMOS survey of z>4.4 quasars - I. Measuring the mean free path across cosmic time
• Average Extinction Curves and Relative Abundances for QSO Absorption Line Systems at 1 <= z_abs < 2
• Spectroscopic Identification of a Proto-Cluster at z=2.300: Environmental Dependence of Galaxy Properties at High Redshift
• A Refined Measurement of the Mean Transmitted Flux in the Ly-alpha Forest over 2 < z < 5 Using Composite Quasar Spectra
• A Definitive Survey for Lyman Limit Systems at z~3.5 with the Sloan Digital Sky Survey
• The large-scale cross-correlation of Damped Lyman Alpha Systems with the Lyman Alpha Forest: First Measurements from BOSS
• Galactic winds in the intergalactic medium
• Mass-metallicity relation from z=5 to the present: Evidence for a transition in the mode of galaxy growth at z=2.6 due to the end of sustained primordial gas infall
• The intergalactic medium over the last 10 billion years II: Metal-line absorption and physical conditions
• Large-scale Filamentary Structure around the Protocluster at Redshift z=3.1
• Damped Lyman-alpha absorbers as a probe of stellar feedback
• Hydrogen and Metal Line Absorption Around Low-Redshift Galaxies in Cosmological Hydrodynamic Simulations
• The Evolution of Ly-alpha Emitting Galaxies Between z = 2.1 and z = 3.1
• Extended Lyman Alpha Nebulae at z ~ 2.3: An Extremely Rare and Strongly Clustered Population?
• The large-scale Quasar-Lyman α Forest Cross-Correlation from BOSS
• Spatial correlation between submillimetre and Lyman-alpha galaxies in the SSA 22 protocluster
• The Subaru Ly-alpha blob survey: A sample of 100 kpc Ly-alpha blobs at z=3
• An unbiased measurement of the UV background and its evolution via the proximity effect in quasar spectra
• The H I opacity of the intergalactic medium at redshifts 1.6 < z < 3.2
• A connection between extremely strong Damped Lyman-alpha Systems and Lyman-alpha Emitting Galaxies at small impact parameters
• Further multiwavelength observations of the SSA22 Ly_alpha emitting `blob'
• A Flat Photoionization Rate at 2<z<4.2: Evidence for a Stellar-Dominated UV Background and Against a Decline of Cosmic Star Formation Beyond z~3
• The BOSS Lyman-alpha Forest Sample from SDSS Data Release 9
• Discovery of a large number of candidate proto-clusters traced by ~15 Mpc-scale galaxy overdensities in COSMOS
• IGM Constraints from the SDSS-III/BOSS DR9 Ly-alpha Forest Flux Probability Distribution Function
• The impact of feedback from galaxy formation on the Lyman-alpha transmitted flux
• Strong Field-to-Field Variation of Lyman alpha Nebulae Populations at z~2.3
• Directly imaging damped Ly-alpha galaxies at z>2. III: The star formation rates of neutral gas reservoirs at z~2.7
• Mean-flux Regulated PCA Continuum Fitting of SDSS Lyman-alpha Forest Spectra
• Observational Requirements for Lyman-alpha Forest Tomographic Mapping of Large-Scale Structure at z ~ 2
• Probing the Circumgalactic Medium at High-Redshift Using Composite BOSS Spectra of Strong Lyman-alpha Forest Absorbers
• Survey for Galaxies Associated with z~3 Damped Lyman alpha Systems II: Galaxy-Absorber Correlation Functions
• The Stacked Lyman-Alpha Emission Profile from the Circum-Galactic Medium of z~2 Quasars
• Discovery of a Very Large Structure at Z=3.78
• On the connection between the intergalactic medium and galaxies: The HI-galaxy cross-correlation at z < 1
• Lyman Break Galaxies and the Lyman-alpha Forest
• Absorption signatures of warm-hot gas at low redshift: Broad HI Lyman-Alpha Absorbers
• Metallicity Evolution of Damped Lyman Alpha Systems In Lambda CDM Cosmology
• The LBT Bootes Field Survey: I. The Rest-frame UV and Luminosity Functions and Clustering of Bright Lyman Break Galaxies at z~3
• Protocluster Discovery in Tomographic Ly$\alpha$ Forest Flux Maps
• The Keck+Magellan Survey for Lyman Limit Absorption III: Sample Definition and Column Density Measurements
• The nature of damped Lyman alpha and sub-damped Lyman alpha absorbers
• Metal abundances at z<1.5: new measurements in sub-Damped Lyman-alpha Absorbers
• The Properties of Lyman Alpha Nebulae: Gas Kinematics from Non-resonant Lines
• The Non-Linear Matter Power Spectrum in Warm Dark Matter Cosmologies
• LyMAS: Predicting Large-Scale Lyman-alpha Forest Statistics from the Dark Matter Density Field
• The evolution of the Lyman-alpha forest effective optical depth following HeII reionisation
• Prime Focus Spectrograph - Subaru's future -
• Large-scale Correlation of Mass and Galaxies with the Lyman-alpha Forest Transmitted Flux
• The metrology cameras for Subaru PFS and FMOS
• Extended Lyman-alpha emission from a high-z DLA at z=3.115
• A Glimpse at Quasar Host Galaxy Far-UV Emission, Using DLAs as Natural Coronagraphs
• Observations of the Gas Reservoir around a Star Forming Galaxy in the Early Universe
• A search for galaxies in and around an HI overdense region at z=5

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• Simba: The average properties of the circumgalactic medium of $2\le z\le 3$ quasars are determined primarily by stellar feedback
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• Spectroscopic Confirmation of two Extremely Massive Protoclusters BOSS1244 and BOSS1542 at $z=2.24$
• Submillimetre galaxies in two massive protoclusters at z = 2.24: witnessing the enrichment of extreme starbursts in the outskirts of HAE density peaks
• A detailed study of massive galaxies in a protocluster at z=3.13
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• Cosmic Galaxy-IGM HI Relation at $z\sim 2-3$ Probed in the COSMOS/UltraVISTA $1.6$ deg${}^2$ Field
• TARDIS Paper II: Synergistic Density Reconstruction from Lyman-alpha Forest and Spectroscopic Galaxy Surveys with Applications to Protoclusters and the Cosmic Web
• Groups and protocluster candidates in the CLAUDS and HSC-SSP joint deep surveys
• Observational Evidence for Large-Scale Gas Heating in a Galaxy Protocluster at z=2.30
• Environmental dependence of the mass-metallicity relation in cosmological hydrodynamical simulations
• The Breakdown Scale of HI Bias Linearity
• 3D Distribution Map of HI Gas and Galaxies Around an Enormous Ly$\alpha$ Nebula and Three QSOs at $z=2.3$ Revealed by the HI Tomographic Mapping Technique
• Cosmological 3D HI Gas Map with HETDEX Ly$\alpha$ Emitters and eBOSS QSOs at $z=2$: IGM-Galaxy/QSO Connection and a $\sim$ 40-Mpc Scale Giant HII Bubble Candidate
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• The SUPERCOLD-CGM survey: \\ I. Probing the extended CO(4-3) Emission of the Circumglactic medium in a sample of 10 Enormous Ly$\alpha$ Nebulae at $z\sim 2$
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• Searching for the shadows of giants II: the effect of local ionisation on the Lyman-$\alpha$ absorption signatures of protoclusters at redshift $z\sim 2.4$
• Probing the Mpc-scale environment of hyperluminous infrared galaxies at 2<z<4
• Galaxy populations of ProtoClusters in cosmological hydrodynamical simulations
• Connection Between Galaxies and HI in the Circumgalactic and Intergalactic Media: Variation According to Galaxy Stellar Mass and Star-formation Activity
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• Improved Lyman Alpha Tomography using Optimized Reconstruction with Constraints on Absorption (ORCA)
• Characterizing the assembly of dark matter halos with protohalo size histories: I. Redshift evolution, relation to descendant halos, and halo assembly bias
• The Role of Dust, UV Luminosity and Large-scale Environment on the Escape of Lya Photons: A Case Study of a Protocluster field at z = 3.1
• Photometric IGM tomography with Subaru/HSC: the large-scale structure of Ly$\alpha$ emitters and IGM transmission in the COSMOS field at $z\sim 5$
• Circumgalactic Ly$\alpha$ Nebulae in Overdense Quasar Pair Regions Observed with the Palomar Cosmic Web Imager
• LATIS: A Sample of IGM-selected Protoclusters and Protogroups at $z\sim 2.5$
• LATIS: Comparing Galaxy and IGM Tomography Maps as Tracers of Large-scale Structure and Protoclusters at $z\sim 2.5$
• Probing the influence of the protocluster environment on galaxy morphology at z = 2.23
• Resolving circumgalactic gas flows around a z$\approx$3.6 quasar using MUSE and ALMA