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MAPPING the MOST MASSIVE OVERDENSITY THROUGH HYDROGEN (MAMMOTH). I. METHODOLOGY

Bian, Fuyan; Cai, Zheng; Fan, Xiaohui; Peirani, S; Frye, Brenda; McGreer, Ian; Prochaska, J. Xavier; Lau, Marie Wingyee; Tejos, Nicolas; Ho, Shirley; Schneider, D P

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Modern cosmology predicts that a galaxy overdensity (e.g., protocluster) will be associated with a large intergalactic medium gas reservoir, which can be traced by Lyα forest absorption. We have undertaken a systematic study of the relation between Coherently Strong intergalactic Lyα Absorption systems (CoSLAs), which have the highest optical depth (τ) in the τ distribution, and mass overdensities on the scales of ~10–20 h −1 comoving Mpc. On such large scales, our cosmological simulations show...[Show more]

dc.contributor.authorBian, Fuyan
dc.contributor.authorCai, Zheng
dc.contributor.authorFan, Xiaohui
dc.contributor.authorPeirani, S
dc.contributor.authorFrye, Brenda
dc.contributor.authorMcGreer, Ian
dc.contributor.authorProchaska, J. Xavier
dc.contributor.authorLau, Marie Wingyee
dc.contributor.authorTejos, Nicolas
dc.contributor.authorHo, Shirley
dc.contributor.authorSchneider, D P
dc.date.accessioned2018-11-29T22:52:40Z
dc.date.available2018-11-29T22:52:40Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/152244
dc.description.abstractModern cosmology predicts that a galaxy overdensity (e.g., protocluster) will be associated with a large intergalactic medium gas reservoir, which can be traced by Lyα forest absorption. We have undertaken a systematic study of the relation between Coherently Strong intergalactic Lyα Absorption systems (CoSLAs), which have the highest optical depth (τ) in the τ distribution, and mass overdensities on the scales of ~10–20 h −1 comoving Mpc. On such large scales, our cosmological simulations show a strong correlation between the effective optical depth (τ eff) of the CoSLAs and the three-dimensional mass overdensity. In spectra with moderate signal-to-noise ratio, however, the profiles of CoSLAs can be confused with individual high column density absorbers. For z > 2.6, where the corresponding Lyβ is redshifted to the optical, we have developed a selection technique to distinguish between these two alternatives. We have applied this technique to ~6000 sight lines provided by Sloan Digital Sky Survey III quasar survey at z = 2.6–3.3 with a continuum-to-noise ratio greater than 8, and we present a sample of five CoSLA candidates with τ eff on 15 h −1 Mpc greater than 4.5× 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 with small angular separations. Our overdensity searches fully use the current and next generation of Lyα forest surveys, which cover a survey volume of >1 (h −1 Gpc)3. Systems traced by CoSLAs will yield a uniform sample of the most massive overdensities at z > 2 to provide stringent constraints to models of structure formation.
dc.format.mimetypeapplication/pdf
dc.publisherIOP Publishing
dc.sourceThe Astrophysical Journal
dc.titleMAPPING the MOST MASSIVE OVERDENSITY THROUGH HYDROGEN (MAMMOTH). I. METHODOLOGY
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume833
dc.date.issued2016
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.absfor020109 - Space and Solar Physics
local.identifier.ariespublicationu4485658xPUB64
local.type.statusPublished Version
local.contributor.affiliationBian, Fuyan, College of Science, ANU
local.contributor.affiliationCai, Zheng, University of Arizona
local.contributor.affiliationFan, Xiaohui, University of Arizona
local.contributor.affiliationPeirani, S, Institut d’ Astrophysique de Paris
local.contributor.affiliationFrye, Brenda, University of Arizona
local.contributor.affiliationMcGreer, Ian, University of Arizona
local.contributor.affiliationProchaska, J. Xavier, University of California
local.contributor.affiliationLau, Marie Wingyee, University of California
local.contributor.affiliationTejos, Nicolas, University of California
local.contributor.affiliationHo, Shirley, Carnegie Mellon University
local.contributor.affiliationSchneider, D P, The Pennsylvania State University
local.bibliographicCitation.issue2
local.identifier.doi10.3847/1538-4357/833/2/135
dc.date.updated2018-11-29T07:47:40Z
local.identifier.scopusID2-s2.0-85007543291
local.identifier.thomsonID000391169600010
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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