The evolution of neutral hydrogen over the past 11 Gyr via H i 21 cm absorption

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dc.contributor.authorGrasha, Kathryn
dc.contributor.authorDarling, J.
dc.contributor.authorLeroy, Adam K
dc.contributor.authorBolatto, Alberto
dc.date.accessioned2022-10-12T23:24:50Z
dc.date.available2022-10-12T23:24:50Z
dc.date.issued2020
dc.date.updated2021-11-28T07:22:54Z
dc.description.abstractWe present the results of a blind search for intervening H i 21 cm absorption towards 260 radio sources in the redshift range 0 < z < 2.74 with the Green Bank Telescope. The survey has the sensitivity to detect sub-damped Ly α (DLA) systems for H i spin temperatures Ts/f = 100 K, and despite the successful re-detection of 10 known 21 cm absorbers in the sample, we detect no new absorption lines in the full survey. Sources detected in 21 cm absorption were also searched for hydroxyl (OH) 18 cm absorption and we re-detect 1667 MHz OH absorption towards PKS 1830-211. We searched for intervening H i 21 cm absorption along the line of sight in each source achieving a total redshift coverage of Δz = 88.64 (comoving absorption path of ΔX = 159.5) after removing regions affected by radio frequency interference. We compute a 95 per cent confidence upper limit on the column density frequency distribution f(NH i) and set a statistical constraint on the spin temperature Ts in the range 100-1000 K, consistent with prior redshifted optical DLA surveys and H i 21 cm emission observations at the same redshifts. We infer a value for the cosmological mass density of neutral gas, ωH i. Through comparison with prior ωH i measurements, we place a statistical constraint on the mean spin temperature of Ts/f = 175 K. Our derived ωH i values support a relative mild evolution in ωH i over the last 11 Gyr and are consistent with other methods that measure ωH i.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0035-8711en_AU
dc.identifier.urihttp://hdl.handle.net/1885/274517
dc.language.isoen_AUen_AU
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/24618/..."published version can be archived in institutional repository" from Sherpa/Romeo site as at 13/10/2022en_AU
dc.publisherBlackwell Publishing Ltden_AU
dc.relationhttp://purl.org/au-research/grants/arc/FL150100113en_AU
dc.relationhttp://purl.org/au-research/grants/arc/CE170100013en_AU
dc.rights© 2020 The authorsen_AU
dc.sourceMonthly Notices of the Royal Astronomical Societyen_AU
dc.subjectstars: evolutionen_AU
dc.subjectgalaxies: high-redshiften_AU
dc.subjectgalaxies: ISMen_AU
dc.subjectquasars: absorption linesen_AU
dc.subjectcosmology: observationsen_AU
dc.subjectradio lines: galaxiesen_AU
dc.titleThe evolution of neutral hydrogen over the past 11 Gyr via H i 21 cm absorptionen_AU
dc.typeJournal articleen_AU
local.bibliographicCitation.issue1en_AU
local.bibliographicCitation.lastpage898en_AU
local.bibliographicCitation.startpage883en_AU
local.contributor.affiliationGrasha, Kathryn, College of Science, ANUen_AU
local.contributor.affiliationDarling, J., University of Coloradoen_AU
local.contributor.affiliationLeroy, Adam K, The Ohio State Universityen_AU
local.contributor.affiliationBolatto, Alberto, University of Marylanden_AU
local.contributor.authoremailu1050982@anu.edu.auen_AU
local.contributor.authoruidGrasha, Kathryn, u1050982en_AU
local.description.notesImported from ARIESen_AU
local.identifier.absfor510104 - Galactic astronomyen_AU
local.identifier.absfor510201 - Atomic and molecular physicsen_AU
local.identifier.absfor510103 - Cosmology and extragalactic astronomyen_AU
local.identifier.ariespublicationa383154xPUB16389en_AU
local.identifier.citationvolume498en_AU
local.identifier.doi10.1093/mnras/staa2521en_AU
local.identifier.scopusID2-s2.0-85096911731
local.identifier.uidSubmittedBya383154en_AU
local.publisher.urlhttps://academic.oup.com/en_AU
local.type.statusPublished Versionen_AU

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