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INTERGALACTIC MEDIUM EMISSION OBSERVATIONS WITH THE COSMIC WEB IMAGER. II. DISCOVERY OF EXTENDED, KINEMATICALLY LINKED EMISSION AROUND SSA22 Ly alpha BLOB 2

Martin, D Christopher; Chang (deceased), Daphne Y.; Matuszewski, Mateusz; Morrissey, Patrick; Rahman, Shahin; Moore, Anna; Steidel, Charles; Matsuda, Yuichi

Description

The intergalactic medium (IGM) is the dominant reservoir of baryons, delineates the large-scale structure of the universe at low to moderate overdensities, and provides gas from which galaxies form and evolve. Simulations of a cold-dark-matter- (CDM-) dominated universe predict that the IGM is distributed in a cosmic web of filaments and that galaxies should form along and at the intersections of these filaments. While observations of QSO absorption lines and the large-scale distribution of...[Show more]

dc.contributor.authorMartin, D Christopher
dc.contributor.authorChang (deceased), Daphne Y.
dc.contributor.authorMatuszewski, Mateusz
dc.contributor.authorMorrissey, Patrick
dc.contributor.authorRahman, Shahin
dc.contributor.authorMoore, Anna
dc.contributor.authorSteidel, Charles
dc.contributor.authorMatsuda, Yuichi
dc.date.accessioned2018-11-29T22:52:27Z
dc.date.available2018-11-29T22:52:27Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/152180
dc.description.abstractThe intergalactic medium (IGM) is the dominant reservoir of baryons, delineates the large-scale structure of the universe at low to moderate overdensities, and provides gas from which galaxies form and evolve. Simulations of a cold-dark-matter- (CDM-) dominated universe predict that the IGM is distributed in a cosmic web of filaments and that galaxies should form along and at the intersections of these filaments. While observations of QSO absorption lines and the large-scale distribution of galaxies have confirmed the CDM paradigm, the cosmic web of IGM has never been confirmed by direct imaging. Here we report our observation of the Lyα blob 2 (LAB2) in SSA22 with the Cosmic Web Imager (CWI). This is an integral field spectrograph optimized for low surface brightness, extended emission. With 22 hr of total on- and off-source exposure, CWI has revealed that LAB2 has extended Lyα emission that is organized into azimuthal zones consistent with filaments. We perform numerous tests with simulations and the data to secure the robustness of this result, which relies on data with modest signal-to-noise ratios. We have developed a smoothing algorithm that permits visualization of data cube slices along image or spectral image planes. With both raw and smoothed data cubes we demonstrate that the filaments are kinematically associated with LAB2 and display double-peaked profiles characteristic of optically thick Lyα emission. The flux is 10-20 times brighter than expected for the average emission from the IGM but is consistent with boosted fluorescence from a buried QSO or gravitation cooling radiation. Using simple emission models, we infer a baryon mass in the filaments of at least 1-4 × 1011 M ☉, and the dark halo mass is at least 2 × 1012 M ☉. The spatial-kinematic morphology is more consistent with inflow from the cosmic web than outflow from LAB2, although an outflow feature maybe present at one azimuth. LAB2 and the surrounding gas have significant and coaligned angular momentum, strengthening the case for their association.
dc.format.mimetypeapplication/pdf
dc.publisherIOP Publishing
dc.sourceThe Astrophysical Journal
dc.titleINTERGALACTIC MEDIUM EMISSION OBSERVATIONS WITH THE COSMIC WEB IMAGER. II. DISCOVERY OF EXTENDED, KINEMATICALLY LINKED EMISSION AROUND SSA22 Ly alpha BLOB 2
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume786
dc.date.issued2014
local.identifier.absfor020199 - Astronomical and Space Sciences not elsewhere classified
local.identifier.ariespublicationa383154xPUB8621
local.type.statusPublished Version
local.contributor.affiliationMartin, D Christopher, California Institute of Technology
local.contributor.affiliationChang (deceased), Daphne Y., California Institute of Technology
local.contributor.affiliationMatuszewski, Mateusz, Cahill Center for Astrophysics, California Institute of Technology
local.contributor.affiliationMorrissey, Patrick, Cahill Center for Astrophysics, California Institute of Technology
local.contributor.affiliationRahman, Shahin, California Institute of Technology
local.contributor.affiliationMoore, Anna, College of Science, ANU
local.contributor.affiliationSteidel, Charles, California Institute of Technology
local.contributor.affiliationMatsuda, Yuichi, California Institute of Technology
local.bibliographicCitation.issue2
local.identifier.doi10.1088/0004-637X/786/2/107
dc.date.updated2018-11-29T07:46:09Z
local.identifier.scopusID2-s2.0-84907217386
local.identifier.thomsonID000335884500031
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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