The clustering and evolution of H-alpha emitters at z~1 from HiZELS
(Abridged) The clustering properties of a well-defined sample of 734 H-alpha emitters at z=0.84 obtained as part of the Hi-z Emission Line Survey (HiZELS) are investigated. The spatial correlation function is very well-described by (r/r_0)^-1.8, with r_0=2.7+-0.3Mpc/h. The correlation length r_0 inc...
| Main Authors: | , , , , , , , |
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| Format: | Journal article |
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2009
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| _version_ | 1797080062070095872 |
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| author | Sobral, D Best, P Geach, J Smail, I Cirasuolo, M Garn, T Dalton, G Kurk, J |
| author_facet | Sobral, D Best, P Geach, J Smail, I Cirasuolo, M Garn, T Dalton, G Kurk, J |
| author_sort | Sobral, D |
| collection | OXFORD |
| description | (Abridged) The clustering properties of a well-defined sample of 734 H-alpha emitters at z=0.84 obtained as part of the Hi-z Emission Line Survey (HiZELS) are investigated. The spatial correlation function is very well-described by (r/r_0)^-1.8, with r_0=2.7+-0.3Mpc/h. The correlation length r_0 increases strongly with H-alpha luminosity, L_H-alpha, from r_0~2Mpc/h for the most quiescent galaxies (star-formation rates of ~4M_sun/yr), up to r_0>5Mpc/h for the brightest galaxies in H-alpha. The correlation length also increases with increasing rest-frame K-band luminosity (M_K), but the r_0-L_H-alpha correlation maintains its full statistical significance at fixed M_K. At z=0.84, star-forming galaxies classified as irregulars or mergers are much more clustered than discs and non-mergers, but once the samples are matched in L_H-alpha and M_K, the differences vanish, implying that the clustering is independent of morphological type at z~1. The typical H-alpha emitters found at z=0.84 reside in dark-matter haloes of ~10^12M_sun, but those with the highest SFRs reside in more massive haloes of ~10^13M_sun. Comparing the results with those of H-alpha surveys at different redshifts, it is seen that although the break of the H-alpha luminosity function, L*, evolves by a factor of ~30 from z=0.24 to z=2.23, galaxies with the same L_H-alpha/L*(z) are found in dark matter haloes of similar masses, independently of cosmic time. This not only confirms that star-formation is more efficient at higher redshift, but also suggests a fundamental connection between the strong decrease of L* since z=2.23 and the quenching of star-formation in galaxies residing within dark-matter haloes significantly more massive than 10^12M_sun at any given epoch. |
| first_indexed | 2024-03-07T00:54:45Z |
| format | Journal article |
| id | oxford-uuid:87a753cc-e40b-490a-a9a3-c08e63b9e46b |
| institution | University of Oxford |
| last_indexed | 2024-03-07T00:54:45Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:87a753cc-e40b-490a-a9a3-c08e63b9e46b2022-03-26T22:12:03ZThe clustering and evolution of H-alpha emitters at z~1 from HiZELSJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:87a753cc-e40b-490a-a9a3-c08e63b9e46bSymplectic Elements at Oxford2009Sobral, DBest, PGeach, JSmail, ICirasuolo, MGarn, TDalton, GKurk, J(Abridged) The clustering properties of a well-defined sample of 734 H-alpha emitters at z=0.84 obtained as part of the Hi-z Emission Line Survey (HiZELS) are investigated. The spatial correlation function is very well-described by (r/r_0)^-1.8, with r_0=2.7+-0.3Mpc/h. The correlation length r_0 increases strongly with H-alpha luminosity, L_H-alpha, from r_0~2Mpc/h for the most quiescent galaxies (star-formation rates of ~4M_sun/yr), up to r_0>5Mpc/h for the brightest galaxies in H-alpha. The correlation length also increases with increasing rest-frame K-band luminosity (M_K), but the r_0-L_H-alpha correlation maintains its full statistical significance at fixed M_K. At z=0.84, star-forming galaxies classified as irregulars or mergers are much more clustered than discs and non-mergers, but once the samples are matched in L_H-alpha and M_K, the differences vanish, implying that the clustering is independent of morphological type at z~1. The typical H-alpha emitters found at z=0.84 reside in dark-matter haloes of ~10^12M_sun, but those with the highest SFRs reside in more massive haloes of ~10^13M_sun. Comparing the results with those of H-alpha surveys at different redshifts, it is seen that although the break of the H-alpha luminosity function, L*, evolves by a factor of ~30 from z=0.24 to z=2.23, galaxies with the same L_H-alpha/L*(z) are found in dark matter haloes of similar masses, independently of cosmic time. This not only confirms that star-formation is more efficient at higher redshift, but also suggests a fundamental connection between the strong decrease of L* since z=2.23 and the quenching of star-formation in galaxies residing within dark-matter haloes significantly more massive than 10^12M_sun at any given epoch. |
| spellingShingle | Sobral, D Best, P Geach, J Smail, I Cirasuolo, M Garn, T Dalton, G Kurk, J The clustering and evolution of H-alpha emitters at z~1 from HiZELS |
| title | The clustering and evolution of H-alpha emitters at z~1 from HiZELS |
| title_full | The clustering and evolution of H-alpha emitters at z~1 from HiZELS |
| title_fullStr | The clustering and evolution of H-alpha emitters at z~1 from HiZELS |
| title_full_unstemmed | The clustering and evolution of H-alpha emitters at z~1 from HiZELS |
| title_short | The clustering and evolution of H-alpha emitters at z~1 from HiZELS |
| title_sort | clustering and evolution of h alpha emitters at z 1 from hizels |
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