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dc.contributor.authorSobral, D.
dc.contributor.authorBest, P.N.
dc.contributor.authorGeach, J.E.
dc.contributor.authorSmail, I.
dc.contributor.authorKurk, J.
dc.contributor.authorCirasuolo, M.
dc.contributor.authorCasali, M.
dc.contributor.authorIvison, R.J.
dc.contributor.authorCoppin, Kristen
dc.contributor.authorDalton, G.B.
dc.date.accessioned2014-01-27T11:00:27Z
dc.date.available2014-01-27T11:00:27Z
dc.date.issued2009-09-01
dc.identifier.citationSobral , D , Best , P N , Geach , J E , Smail , I , Kurk , J , Cirasuolo , M , Casali , M , Ivison , R J , Coppin , K & Dalton , G B 2009 , ' HiZELS - A high-redshift survey of Hα emitters - II : the nature of star-forming galaxies at z = 0.84 ' , Monthly Notices of the Royal Astronomical Society , vol. 398 , no. 1 , pp. 75-90 . https://doi.org/10.1111/j.1365-2966.2009.15129.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 2713138
dc.identifier.otherPURE UUID: 6401e765-d2aa-4b99-bf4f-3c373b7ac620
dc.identifier.otherScopus: 69449105854
dc.identifier.otherORCID: /0000-0002-0729-2988/work/30423102
dc.identifier.urihttp://hdl.handle.net/2299/12675
dc.description.abstractNew results from a large survey of Hα emission-line galaxies at z = 0.84 using the Wide Field Camera on the United Kingdom Infrared Telescope and a custom narrow-band filter in the J band are presented as part of the High-z Emission Line Survey (HiZELS). The deep narrow-band images reach an effective flux limit of F ∼ 10 erg s cm in a comoving volume of 1.8 × 10 Mpc , resulting in the largest and deepest survey of its kind ever done at z ∼ 1. There are 1517 potential line emitters detected across ∼1.4 deg , of which 743 are selected as Hα emitters, based on their photometric and spectroscopic redshifts. These are then used to calculate the Hα luminosity function, which is well fitted by a Schechter function with L* = 10 erg s , φ* = 10 Mpc and α = -1.65 ± 0.15, and are used to estimate the volume average star formation rate (SFR) at z = 0.845, ρ : 0.15 ± 0.01 M yr Mpc (corrected for 15 per cent active galactic nucleus contamination and integrated down to 2.5 M yr ). These results robustly confirm a strong evolution of ρ from the present day out to z ∼ 1 and then flattening to z ∼ 2 using a single star formation indicator: Hα luminosity. Out to z ∼ 1, both the characteristic luminosity and space density of the Hα emitters increase significantly; at higher redshifts, L* continues to increase, but φ* decreases. The z = 0.84 Hα emitters are mostly disc galaxies (82 ± 3 per cent), while 28 ± 4 per cent of the sample shows signs of merger activity; mergers account for ∼20 per cent of the total integrated ρ at this redshift. Irregulars and mergers dominate the Hα luminosity function above L*, while discs are dominant at fainter luminosities. These results demonstrate that it is the evolution of 'normal' disc galaxies that drives the strong increase in the SFR density from the current epoch to z ∼ 1, although the continued strong evolution of L* beyond z = 1 suggests an increasing importance of merger activity at higher redshifts.en
dc.format.extent16
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.titleHiZELS - A high-redshift survey of Hα emitters - II : the nature of star-forming galaxies at z = 0.84en
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionCentre for Climate Change Research
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre of Data Innovation Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=69449105854&partnerID=8YFLogxK
rioxxterms.versionSMUR
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2009.15129.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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