Modelling the Evolution of Ly$\alpha$ Blobs and Ly$\alpha$ Emitters

Abstract

In this work we model the observed evolution in comoving number density of Lyman-alpha blobs (LABs) as a function of redshift, and try to find which mechanism of emission is dominant in LAB. Our model calculates LAB emission both from cooling radiation from the intergalactic gas accreting onto galaxies and from star formation (SF). We have used dark matter (DM) cosmological simulation to which we applied empirical recipes for Ly$\alpha$ emission produced by cooling radiation and SF in every halo. In difference to the previous work, the simulated volume in the DM simulation is large enough to produce an average LABs number density. At a range of redshifts $z\sim 1-7$ we compare our results with the observed luminosity functions of LABs and LAEs. Our cooling radiation luminosities appeared to be too small to explain LAB luminosities at all redshifts. In contrast, for SF we obtained a good agreement with observed LFs at all redshifts studied. We also discuss uncertainties which could influence the obtained results, and how LAB LFs could be related to each other in fields with different density.

arXiv comment19 pages, 19 figures, submitted to MNRAS

References in corpus (80)

• Star Formation in Galaxies Along the Hubble Sequence
• The cosmological simulation code GADGET-2
• Populating a cluster of galaxies - I. Results at z=0
• How Do Galaxies Get Their Gas?
• The Average Star Formation Histories of Galaxies in Dark Matter Halos from z=0-8
• A Line of Sight Approach to Cosmic Microwave Background Anisotropies
• Galaxy Bimodality due to Cold Flows and Shock Heating
• Cold streams in early massive hot haloes as the main mode of galaxy formation
• Galactic star formation and accretion histories from matching galaxies to dark matter haloes
• Resolving Cosmic Structure Formation with the Millennium-II Simulation
• Galaxies in a simulated $\Lambda$CDM Universe I: cold mode and hot cores
• Statistics of 207 Lya Emitters at a Redshift Near 7: Constraints on Reionization and Galaxy Formation Models
• Transients from Initial Conditions in Cosmological Simulations
• Lyman Alpha Imaging of a Proto-Cluster Region at <z>=3.09
• UV Luminosity Functions at z~4, 5, and 6 from the HUDF and other Deep HST ACS Fields: Evolution and Star Formation History
• 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
• UV Luminosity Functions from 132 z~7 and z~8 Lyman-Break Galaxies in the ultra-deep HUDF09 and wide-area ERS WFC3/IR Observations
• Diffuse Lyman Alpha Emitting Halos: A Generic Property of High Redshift Star Forming Galaxies
• Moving mesh cosmology: tracing cosmological gas accretion
• Transients from Initial Conditions: A Perturbative Analysis
• Bimodal gas accretion in the Horizon-MareNostrum galaxy formation simulation
• Ly Alpha-Emitting Galaxies at z=3.1: L* Progenitors Experiencing Rapid Star Formation
• A Subaru Search for Ly-alpha Blobs in and around the Proto-cluster Region at Redshift z=3.1
• The rates and modes of gas accretion on to galaxies and their gaseous haloes
• The Baryonic Assembly of Dark Matter Halos
• The Subaru Deep Field Project: Lyman$\alpha$ Emitters at Redshift of 6.6
• A Direct Precision Measurement of the Intergalactic Lyman-alpha Opacity at 2<z<4.2
• Lyman Alpha Cooling Radiation from High-Redshift Halos
• Lyman-alpha Cooling Emission from Galaxy Formation
• Bent by baryons: the low mass galaxy-halo relation
• Extended Lyman-alpha emission from cold accretion streams
• Gravitational Quenching in Massive Galaxies and Clusters by Clumpy Accretion
• Spectroscopic Identification of a Proto-Cluster at z=2.300: Environmental Dependence of Galaxy Properties at High Redshift
• The Physical Nature of Lyman Alpha Emitting Galaxies at z=3.1
• Lyman Alpha Blobs as an Observational Signature of Cold Accretion Streams into Galaxies
• Escape of about five per cent of Lyman-alpha photons from high-redshift star-forming galaxies
• Properties of gas in and around galaxy haloes
• Discovery of 9 Ly alpha emitters at redshift z~3.1 using narrow-band imaging and VLT spectroscopy
• Gravity-driven Lyman-alpha blobs from cold streams into galaxies
• Superwind model of extended Lyman alpha emitters at high redshift
• Discovery of a Giant Lya Emitter Near the Reionization Epoch
• Dark Matter Sub-Halo Counts via Star Stream Crossings
• The Star Formation Rate Function for Redshift z~4-7 Galaxies: Evidence for a Uniform Build-Up of Star-Forming Galaxies During the First 3 Gyr of Cosmic Time
• Lyman-alpha Emission from Structure Formation
• The Chandra Deep Protocluster Survey: Ly-alpha Blobs are powered by heating, not cooling
• A Luminosity Function of Lyman Alpha Emitting Galaxies at Redshift 4.5
• A multi-wavelength study of z = 3.15 Lyman-alpha emitters in the GOODS South Field
• Extended Lyman Alpha Nebulae at z ~ 2.3: An Extremely Rare and Strongly Clustered Population?
• The Ages and Masses of Lyman Alpha Galaxies at Redshift $z\sim 4.5$
• The Distribution of Lya-Emitting Galaxies at z=2.3
• Sub-mm imaging of a proto-cluster region at z=3.09
• Central Powering of the Largest Lyman-alpha Nebula is Revealed by Polarized Radiation
• A New Population of High Redshift, Dusty Lyman-Alpha Emitters and Blobs Discovered by WISE
• A submm survey of Lyman-alpha haloes in the SA22 protocluster at z=3.1
• How Do Galaxies Get Their Gas?
• Systematic Survey of Extended Lyman-alpha Sources over z~3-5
• Strong Field-to-Field Variation of Lyman alpha Nebulae Populations at z~2.3
• A Keck/DEIMOS Spectroscopy of Lyman Alpha Blobs at Redshift z=3.1
• Halo and Galaxy Formation Histories from the Millennium Simulation: Public release of a VO-oriented and SQL-queryable database for studying the evolution of galaxies in the LambdaCDM cosmogony
• IGM Emission Observations with the Cosmic Web Imager: II. Discovery of Extended, Kinematically-Linked Emission around SSA22 Lyman-alpha Blob 2
• Filamentary Large Scale Structure Traced by Six Ly-alpha Blobs at z=2.3
• Photometric properties of Ly alpha emitters at z=4.86 in the COSMOS 2 square degree field
• Spitzer identifications and classifications of submillimeter galaxies in giant, high-redshift Lyman-alpha emission-line nebulae
• X-Ray Detection of an Obscured Active Galactic Nucleus in a z=3.09 Radio-quiet Ly-alpha Nebula
• Resolving the Galaxies within a Giant Lya Nebula: Witnessing the Formation of a Galaxy Group?
• Deep Spectroscopy of Systematically Surveyed Extended Lyman-alpha Sources at z~3-5
• Group-finding with photometric redshifts: The Photo-z Probability Peaks algorithm
• Nature of Lyman Alpha Blobs: Powered by Extreme Starbursts
• Overturning the Case for Gravitational Powering in the Prototypical Cooling Lyman-alpha Nebula
• Were progenitors of local L* galaxies Lyman-alpha emitters at high redshift?
• Infrared and millimetre-wavelength evidence for cold accretion within a z = 2.83 Lyman-alpha blob
• HeII emission in Lyman-alpha nebulae: AGN or cooling radiation?
• Simulated star formation rate functions at z~4-7, and the role of feedback in high-z galaxies
• Empirical Constraints on the Star Formation & Redshift Dependence of the Lyman Alpha `Effective' Escape Fraction
• A Flux-Limited Sample of z~1 Ly-alpha Emitting Galaxies in the CDFS
• Giant Ly-alpha nebulae in the high redshift (z>2) Universe
• Star Formation Rate Distributions: Inadequacy of the Schechter Function
• The disappearance of Lyman alpha blobs: a GALEX search at z=0.8
• Hot Gas, Cold Gas and Sub-Halos in a Lyman-alpha Blob at Redshift 2.38
• Escape of Lyman alpha Emission in the Starburst Galaxy Mkn 357 - a Wind's Far Side

Cited by in corpus (2)

• J-PLUS: The Javalambre Photometric Local Universe Survey
• The Origin and Evolution of Lyman-alpha Blobs in Cosmological Galaxy Formation Simulations