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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F10%3A10079249%21RIV11-GA0-11320___
rdf:type
skos:Concept n19:Vysledek
dcterms:description
During the epoch of first star formation, molecular hydrogen (H-2) generated via associative detachment (AD) of H- and H is believed to have been the main coolant of primordial gas for temperatures below 10(4) kelvin. The uncertainty in the cross section for this reaction has limited our understanding of protogalaxy formation during this epoch and of the characteristic masses and cooling times for the first stars. We report precise energy-resolved measurements of the AD reaction, made with the use of a specially constructed merged-beams apparatus. Our results agreed well with the most recent theoretically calculated cross section, which we then used in cosmological simulations to demonstrate how the reduced AD uncertainty improves constraints of the predicted masses for Population III stars. During the epoch of first star formation, molecular hydrogen (H-2) generated via associative detachment (AD) of H- and H is believed to have been the main coolant of primordial gas for temperatures below 10(4) kelvin. The uncertainty in the cross section for this reaction has limited our understanding of protogalaxy formation during this epoch and of the characteristic masses and cooling times for the first stars. We report precise energy-resolved measurements of the AD reaction, made with the use of a specially constructed merged-beams apparatus. Our results agreed well with the most recent theoretically calculated cross section, which we then used in cosmological simulations to demonstrate how the reduced AD uncertainty improves constraints of the predicted masses for Population III stars.
dcterms:title
Experimental Results for H-2 Formation from H- and H and Implications for First Star Formation Experimental Results for H-2 Formation from H- and H and Implications for First Star Formation
skos:prefLabel
Experimental Results for H-2 Formation from H- and H and Implications for First Star Formation Experimental Results for H-2 Formation from H- and H and Implications for First Star Formation
skos:notation
RIV/00216208:11320/10:10079249!RIV11-GA0-11320___
n3:aktivita
n10:P n10:Z
n3:aktivity
P(GA202/07/0833), Z(MSM0021620860)
n3:cisloPeriodika
5987
n3:dodaniDat
n5:2011
n3:domaciTvurceVysledku
n13:6207162
n3:druhVysledku
n11:J
n3:duvernostUdaju
n12:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
258327
n3:idVysledku
RIV/00216208:11320/10:10079249
n3:jazykVysledku
n7:eng
n3:klicovaSlova
star formation; associative detachment; merged-beams experiments
n3:klicoveSlovo
n15:star%20formation n15:associative%20detachment n15:merged-beams%20experiments
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[FA6578FED2DB]
n3:nazevZdroje
Science
n3:obor
n18:BG
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
7
n3:projekt
n17:GA202%2F07%2F0833
n3:rokUplatneniVysledku
n5:2010
n3:svazekPeriodika
329
n3:tvurceVysledku
Kreckel, H. Bruhns, H. Čížek, Martin Savin, D. W. Urbain, X. Miller, K. A. Glover, S. C. O.
n3:wos
000279402700033
n3:zamer
n9:MSM0021620860
s:issn
0036-8075
s:numberOfPages
3
n8:organizacniJednotka
11320