2010MNRAS.404.1551S -
Mon. Not. R. Astron. Soc., 404, 1551-1563 (2010/May-3)
The clustering and evolution of Hα emitters at z {∼ 1} from HiZELS.
SOBRAL D., BEST P.N., GEACH J.E., SMAIL I., CIRASUOLO M., GARN T., DALTON G.B. and KURK J.
Abstract (from CDS):
The clustering properties of a well-defined sample of 734 Hα emitters at z = 0.845±0.015, obtained as part of the Hi-z Emission Line Survey, are investigated. The spatial correlation function of these Hα emitters is very well described by the power-law ξ = (r/r0)–1.8, with a real-space correlation, r0, of 2.7±0.3h–1Mpc. The correlation length r0 increases strongly with Hα luminosity (LHα), from r0∼ 2h–1Mpc for the most quiescent galaxies [star formation rates (SFRs) of ∼4M☉/yr] up to r0> 5h–1Mpc for the brightest galaxies in Hα. The correlation length also increases with increasing rest-frame K-band (MK) luminosity, but the r0-LHαcorrelation maintains its full statistical significance at fixed MK. At z = 0.84, star-forming galaxies classified as irregulars or mergers are much more clustered than discs and non-mergers, respectively; however, once the samples are matched in LHα and MK, the differences vanish, implying that the clustering is independent of morphological type at z ∼ 1 just as in the local Universe. The typical Hα emitters found at z = 0.84 reside in dark matter haloes of ~1012M☉, but those with the highest SFRs reside in more massive haloes of ~1013M☉. The results are compared with those of Hα surveys at different redshifts: although the break of the Hα luminosity function L*Hα evolves by a factor of ∼30 from z = 0.24 to 2.23, if the Hα luminosities at each redshift are scaled by L*Hα(z) then the correlation lengths indicate that, independently of cosmic time, galaxies with the same (LHα)/L*Hα(z) are found in dark matter haloes of similar masses. This not only confirms that the star formation efficiency in high redshift haloes is higher than locally but also suggests a fundamental connection between the strong negative evolution of L*Hα since z = 2.23 and the quenching of star formation in galaxies residing within dark matter haloes significantly more massive than 1012M☉ at any given epoch.
Abstract Copyright:
© 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s):
galaxies: evolution - galaxies: haloes - galaxies: high-redshift - cosmology: observations - large-scale structure of Universe
Simbad objects:
1
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